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Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "LIMIT EQUILIBRIUM METHOD (LEM)"

Md Ghazaly, Zuhayr, Mustaqqim Abdul Rahim, Kok Alfred Chee Jee, Nur Fitriah Isa, and Liyana Ahmad Sofri. "Landslide Simulation Using Limit Equilibrium and Finite Element Method." Materials Science Forum 857 (May 2016): 555–59. http://dx.doi.org/10.4028/www.scientific.net/msf.857.555.

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Анотація:

Slope stability analysis is one of the ancient tasks in the geotechnical engineering. There are two major methods; limit equilibrium method (LEM) and finite element method (FEM) that were used to analyze the factor of safety (FOS) to determine the stability of slope. The factor of safety will affect the remediation method to be underdesign or overdesign if the analysis method was not well chosen. This can lead to safety and costing problems which are the main concern. Furthermore, there were no statement that issued one of the analysis methods was more preferred than another. To achieve the objective of this research, the soil sample collected from landslide at Wang Kelian were tested to obtain the parameters of the soils. Then, those results were inserted into Plaxis and Slope/W software for modeling to obtain the factor of safety based on different cases such as geometry and homogenous of slope. The FOS obtained by FEM was generally lower compared to LEM but LEM can provide an obvious critical slip surface. This can be explained by their principles. Overall, the analysis method chosen must be based on the purpose of the analysis.

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Kong, Ying, Hua Peng Shi, and Hong Ming Yu. "Analysis of Unstable Rock-Mass Stability Based on Limit Equilibrium Method and Strength Reduction Method." Applied Mechanics and Materials 858 (November 2016): 73–80. http://dx.doi.org/10.4028/www.scientific.net/amm.858.73.

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With the slope unstable rock masses of a stope in Longsi mine, Jiaozuo City, China as the target, we computed and analyzed the stability of unstable rock masses using a limit equilibrium method (LEM) and a discrete element strength reduction method (SRM). Results show that the unstable rock masses are currently stable. Under the external actions of natural weathering, rainfall and earthquake, unstable rock mass 1 was manifested as a shear slip failure mode, and its stability was controlled jointly by bedding-plane and posterior-margin steep inclined joints. In comparison, unstable rock mass 2 was manifested as a tensile-crack toppling failure mode, and its stability was controlled by the perforation of posterior-margin joints. From the results of the 2 methods we find the safety factor determined from SRM is larger, but not significantly, than that from LEM, and SRM can simulate the progressive failure process of unstable rock masses. SRM also provides information about forces and deformation (e.g. stress-strain, and displacement) and more efficiently visualizes the parts at the slope that are susceptible to instability, suggesting SRM can be used as a supplementation of LEM.

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Syamsul, Syamsul, Ichsan Rauf, Kusnadi Kusnadi, and Nyong Hamin. "Road Slope Stability Analysis with Limit Equilibrium Method." IJEBD (International Journal of Entrepreneurship and Business Development) 6, no. 2 (March 31, 2023): 345–53. http://dx.doi.org/10.29138/ijebd.v6i2.2129.

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Purpose: Landslides are hydrometeorological disasters frequently occurring in many places, particularly during the wet season. Slope stability analysis is the initial stage in defining countermeasures to prevent slope failure and mitigate the negative consequences. This study aims to apply the Limit Equilibrium Method (LEM) to examine the slope stability of the Dufadufa - Jambula road, with the SLIDE version 6.0 application serving as an analytical tool. Design/methodology/approach: Researchers use field measurement data to build a slide application slope model. The soil data used as input parameters are derived using the Robertson chart to interpret the sonder test findings. Findings: According to the results, the minimal slope factor of safety (fs) at the area under consideration is 0.247. It demonstrates that the road slope, which is the study location, is in critical condition; in other words, the slope of the Jambula-Dufadufa road segment has the potential to undergo a slide. Paper type: Research paper

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Li, Hong Jun, Yan Yi Zhang, and Zu Wen Yan. "A Further Study on Soil Slope Stability Analysis by Finite Element Slip Surface Stress Method." Applied Mechanics and Materials 204-208 (October 2012): 492–501. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.492.

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Анотація:

In this paper, it proves that the necessary and sufficient condition for the potential sliding body reaching the ultimate limit equilibrium state is that the summation of shear stresses along the sliding surface equals to that of resistant shear strength. Based on the rigorous theory analyses and derivations, it is clearly shown that the definition of factor of safety (FOS) in the slip surface stress method (SSSM) is irrelevant with the shape of slip surface. Thus, the authors demonstrate that the FOS of noncircular slip surface can also be defined as the ratio of the sum of resistant sliding force along slip surface to that of sliding force. Furthermore, the physical meaning of the FOS in the SSSM, which can be taken as the average evaluation of the strength reduction coefficient that makes the sliding body reach the ultimate limit equilibrium state along the slip surface in nature, is formulated on the basis of strength reserving theory rather than the overloading theory like that in the Limit Equilibrium Method (LEM) and the Shear Strength Reduction Method (SSRM). Finally, the factors of safety (FOS) and the locations of critical failure surfaces obtained by the SSSM, LEM and SSRM are compared for various geotechnical practices. It is found that the SSSM can achieve precise and reasonable stability assessments for the soil slopes on the basis of actual stress field. Consequently, compared with the LEM and SSRM, the SSSM is demonstrated to be effective and efficient alternative approach for routine analysis and design in geotechnical engineering practice with a high level of confidence.

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Yunus, Ahmad Anwar Mohd, Anuar Kasa, Zamri Chik, and Taha Mohd Raihan. "Stability Analyses of an Earth Dam Using Limit Equilibrium and Finite Element Methods." Key Engineering Materials 462-463 (January 2011): 319–24. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.319.

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Анотація:

The objective of this research is to study the relationships between the stability of earth dam and its soil strength parameters. The soil strength parameters include cohesion, unit weight of soil and angle of friction. GeoStudio, commercially available software, was used to obtain the overall factor of safety using limit equilibrium method (LEM) and finite element method (FEM). Tables to show the relationships among soil strength parameters for factor of safety 1.0 and 1.5 are presented in this paper.

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Li, Hongjun, Hong Zhong, Zuwen Yan, and Xuedong Zhang. "Particle Swarm Optimization Algorithm Coupled with Finite Element Limit Equilibrium Method for Geotechnical Practices." Mathematical Problems in Engineering 2012 (2012): 1–14. http://dx.doi.org/10.1155/2012/498690.

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This paper proposes a modified particle swarm optimization algorithm coupled with the finite element limit equilibrium method (FELEM) for the minimum factor of safety and the location of associated noncircular critical failure surfaces for various geotechnical practices. During the search process, the stress compatibility constraints coupled with the geometrical and kinematical compatibility constraints are firstly established based on the features of slope geometry and stress distribution to guarantee realistic slip surfaces from being unreasonable. Furthermore, in the FELEM, based on rigorous theoretical analyses and derivation, it is noted that the physical meaning of the factor of safety can be formulated on the basis of strength reserving theory rather than the overloading theory. Consequently, compared with the limit equilibrium method (LEM) and the shear strength reduction method (SSRM) through several numerical examples, the FELEM in conjunction with the improved search strategy is proved to be an effective and efficient approach to routine analysis and design in geotechnical practices with a high level of confidence.

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Li, Yong Quan, Hang Jing, Qing Huan Wang, and Jun Fu Chen. "Stability Analysis of Soil Slope and the Design of Anti-Slide Piles during Unsteady Seepage." Applied Mechanics and Materials 204-208 (October 2012): 689–93. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.689.

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Principle of calculation of water and earth pressures together by Limit Equilibrium Method (LEM) is introduced, and coupled deformation and seepage analysis is conducted by Finite Element Method (FEM ).The response of one soil slope is simulated during rapid drawdown of water level by LEM and FEM. The results calculated show that seepage upraises the critical slip surfaces, and critical slip surfaces and safety factors by two ways are pretty close. To assure the safety of the slope, the design of anti-slide piles is carried out. Those ways used may provide reference to engineering practice.

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Tan, Wen Hui, Ya Liang Li, and Cong Cong Li. "Research on 2D Limit Equilibrium Method of Slopes Considering the Effect of Horizontal In Situ Stress." Advanced Materials Research 671-674 (March 2013): 245–50. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.245.

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At present, in-situ stress was not considered in Limit Equilibrium Method (LEM) of slopes, the influence of in-situ stress is very small on the stability of conventional slopes, but in deep-depressed open-pit mines, the influence should not be neglected. Formula for calculating the Factor of Safety (FOS) under the effect of horizontal in-situ stress was deduced using General Slice Method (GSM) of two-dimensional (2D) limit equilibrium method in this paper，a corresponding program SSLOPE was built, and the software was used in a deep- depressed open-pit iron mine. The results show that the FOS of the slope decreased by 20% when horizontal in-situ stress is considered, some reinforcements must be taken. Therefore, the influence of in-situ stress on slope stability should be taken into account in deep open –pit mines.

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Luden, Alesandro Sejo, I. Gde Budi Indrawan, and Dwikorita Karnawati. "Slope stability analyses by circular failure chart and limit equilibrium methods: the inlet and outlet of diversion tunnel of Bolango Ulu Dam, Indonesia." E3S Web of Conferences 325 (2021): 01015. http://dx.doi.org/10.1051/e3sconf/202132501015.

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The objective of this research is to evaluate the stability of the natural slopes at the inlet and outlet portals of the Bolangu Ulu diversion tunnel, Gorontalo. The natural slopes were considered stable, and therefore slope stability analyses were not carried out previously in the tunnel portal design. The slope stability analyses were carried out using the Circular Failure Chart (CFC) and Limit Equilibrium Methods (LEM). Input data for the slope stability analyses were obtained from field mapping and laboratory testing of soil and rock samples. The results show that the portal slopes consist of diorite and residual soil. Both stability analysis methods yield nearly the same results. The slope at the outlet section had the factor of safety (FOS) values of 1.29 and 1.30 based on the CFC method and LEM, respectively, indicating the slope in a stable condition. However, the slope at the inlet section had the FOS values of 1.01 and 1.07 based on the CFC method and LEM, respectively, indicating the slope in a critical condition. The results suggest that stabilization of the portal slopes, particularly the portal slope at the inlet section, is required to prevent slope failures under static and earthquake loads.

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Ukleja, Janusz. "Stability estimation of slopes with determined slip surface by the MSTAB-3D method based on sliding body limit equilibrium analysis." MATEC Web of Conferences 262 (2019): 04004. http://dx.doi.org/10.1051/matecconf/201926204004.

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Анотація:

The method developed for this study, established on the premises of the limit equilibrium flat analysis for a spatial solution, is a modification of the STAB-3D method, previously described by the author. It combines the analyses methods of 2D slices of flat cross–sections with the spatial analyses methodology rooted in a specific breakdown of a landslide sliding body into 3D elements assuming some simplifying solution. However, this method is solely applicable in case of a landslide failure with a stipulated slip surface and with a consistent decline of a determined slide direction. Such a method was developed in the article published earlier, which provided then its basic assumptions and the equilibrium formulations. The following publication thereof, presents overall suppositions for this method as well as its modification involving the resultant forces brought to the equilibrium with the generalized slide direction. Apart from that, a comparative analysis was carried out on the impact of this modification applicability of the obtained results with regard to the STAB-3D method. The algorithm was also presented concerning the modified method with its results being compared to a couple of selected methods LEM (limit equilibrium method). The undertaken analysis reveals that the modified MSTAB-3D method determines stability indicators that are very similar to its earlier version. Moreover, the results occur to be also approximating the values obtained in the course of other methods with regard to the flat cross-section analysis.

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Більше джерел

Дисертації з теми "LIMIT EQUILIBRIUM METHOD (LEM)"

Fournier, Mathew. "Investigations into the Shear Strength Reduction method using distinct element models." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2492.

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This thesis reports a detailed investigation into the use of the Shear Strength Reduction (SSR) method to determine factor of safety values in discontinuum models using the Universal Distinct Element Code. The SSR method depends on the definition of failure within the model and two different criteria were compared: the numerical unbalanced force definition and a more qualitative displacement-monitoring based method. A parametric study was first undertaken, using a simple homogeneous rock slope, with three different joint networks representing common kinematic states. Lessons learned from this study were then applied to a more complex case history used for validation of the SSR method. The discontinuum models allow for the failure surface to propagate based on constitutive models that better idealize the rockmass than simpler methods such as limit equilibrium (e.g. either method of slices or wedge solutions) and even numerical continuum models (e.g. finite difference, finite element). Joints are explicitly modelled and can exert a range of influences on the SSR result. Simple elasto-plastic models are used for both the intact rock and joint properties. Strain-softening models are also discussed with respect to the SSR method. The results presented highlight several important relationships to consider related to both numerical procedures and numerical input parameters. The case history was modelled similar to how a typical forward analysis would be undertaken: i.e. simple models with complexities added incrementally. The results for this case generally depict a rotational failure mode with a reduced factor of safety due to the presence of joints within the rockmass when compared to a traditional limit equilibrium analysis. Some models with large persistence of steeply dipping joints were able to capture the actual failure surface. Softening models were employed in order to mimic the generation and propagation of joints through the rockmass in a continuum; however, only discontinuum models using explicitly defined joints in the model were able to capture the correct failure surface.

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Loehr, John Erik. "Development of a hybrid limit equilibrium-finite element procedure for three-dimensional slope stability analysis /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Soliday, Stanley Jr. "Limits of limit equilibrium and finite element techniques applied to cracked debris dams on collapsing foundations." PDXScholar, 1991. https://pdxscholar.library.pdx.edu/open_access_etds/4428.

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Анотація:

Limits of slope stability, limit equilibrium methods, and of the finite element code FEADAM are reached in the application of these methods to the problem of cracked dams constructed on collapsing soils.

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Poruba, Michal. "Návrh sanace sesuvu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227466.

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Main goal of thesis entitled "Landslide remediation design" is - based on acquired knowledge and submitted documents about the problematic of landslides - to determine the causes of the landslides on II. class road between villages Koryčany and Jestřabice and to propose optimal redevelopment.

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Nogueira, Renan Teixeira. "Simulação numérica e equilíbrio limite aplicado a retroanálise de taludes em mineração de carvão." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/152747.

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Анотація:

A pesquisa voltada para a retroanálise de taludes de mineração está se tornando cada vez mais importante. As dimensões das atuais cavas de mineração visam sempre obter a melhor relação entre custo, benefício e segurança. Isso exige que por vezes o trabalho ocorra próximo destes limites. Neste trabalho o estudo de retroanálise consiste em um talude misto composto por aluvião e rocha em uma mineração de carvão localizada no município de Arroio dos Ratos, RS. O objetivo foi realizar um estudo de retroanálise onde se utilizou dois métodos de análise método dos Elementos Finitos (MEF) e o método do Equilíbrio Limite (EL). A metodologia adotada foi dividida em três fases: uma etapa de campo, para coleta do material e dados geométricos do talude, uma etapa de laboratório para caracterizar todo o material e a última etapa computacional onde foram gerados os modelos e simulações numéricas através dos softwares comerciais da empresa RocScience, sendo eles o SLIDE e o RS2. Os resultados encontrados mostraram que a porção do talude composta por aluvião apresentava seis camadas intercaladas de areias bem graduadas e argilas de média a alta plasticidade. Em relação as simulações, observou uma diferença entre o MEF e EL devido ao grande número de camadas presentes no talude e a interação entre elas. Foram criados quatro diferentes cenários para observar o comportamento do talude, com presença e ausência de água. O MEF mostrou uma superfície de ruptura próxima a encontrada porem com a presença de água o Fator de Segurança (FS) sofreu uma grande depreciação. O EL considerou uma superfície de ruptura satisfatória, nas simulações com presença de água FS sofreu uma depreciação mínima mesmo com máxima saturação de água no talude. Apesar das diferenças ambos os métodos são confiáveis mas devem ser usados de forma adequado ao tipo de problema existente. Situações mais simples e com taludes mais homogêneos o EL trona-se mais indicado, para problemas de maior complexidades e interações entre camadas o MEF se mostrou satisfatório e com boa resposta. O resultados através do MEF se aproximaram mais da situação real encontrada em campo.
A research focus on retro analysis on mine slopes is becoming increasingly important. The dimensions of current mining caves aim to always obtain the best cost benefit ratio as well as the highest safety level. This demands that the work sometimes is done within these limits. In this paper the study of retro analysis is made up of a mixed slope composed of alluvial and rocks, in a coal mine in Arroio dos Ratos, RS. The goal was to carry out a retro analysis study using two analysis methods: The Finite Element Method (FEM) and Limit Equilibrium analysis (LE). The methodology adopted was split into three phases: a field stage for the sample collection and slopes geometric , a laboratory stage to classify all the material and a final computacional stage were model and numerical simulations were created by way of commercial software, Slide and RS2, by RocScience. The results showed that the portion of the slope composed of alluvium had six layers interspersed with well graded sands and high plasticity clays. The simulations observed a difference between the FEM and LE due to the number of layers present in the slope and the interaction among them. Four different scenarios were created in order to observe the behavior of the slope. The FEM presents surface failure similar to one found in the field. The LE always takes into consideration the overall critical surface which is not observed in the field, it also show high security factor levels above one 1.3 that does not reflect a real situation since the slope is collapsed. In spike of the differences, both methods are reliable but they must be used according to the existing problems. For simpler situations with homogeneous slopes LE is recommended while move complex problems and interactions among lawyers calls for FEM.

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Osores, Tumbalobos Ana Belén. "Optimización del grado de inclinación de taludes provisionales sin sostenimiento en el Conglomerado de lima mediante la técnica de retroanálisis basado en el método de Equilibrio Límite." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/652234.

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Анотація:

La presente tesis de investigación fue elaborada con la finalidad de contribuir con el estudio de la construcción de rampas de acceso a excavaciones mediante el análisis de los taludes provisionales sin sostenimiento que garanticen la estabilidad global en el Conglomerado de Lima. Las rampas de acceso son estructuras provisionales cuya construcción no se rige bajo normativas o indicaciones establecidas, además no contempla un estudio, se basa en la experiencia del responsable en obra. La ciudad de Lima se emplaza sobre un suelo gravoso el cual contribuye a que sea posible optimizar el grado de inclinación de los taludes provisionales. El alcance de este trabajo consiste en modelar una rampa de acceso en el conglomerado típico de Lima aplicando las sobrecargas existentes de la maquinaria y realizar un análisis de estabilidad global frente a condiciones estáticas y pseudodinámicas. Mediante la técnica de retroanálisis basándose en el método de Equilibrio Límite en Slide se estimarán los parámetros de resistencia mínimos característicos de la grava de Lima, el parámetro de cohesión y ángulo de fricción. A partir de ello se procederá a la optimización de los taludes, evaluando los diferentes grados de inclinación, y se estimarán las deformaciones producidas en los taludes a través del programa Plaxis, basado en Elementos Finitos. Finalmente se exponen las conclusiones obtenidas de la presente tesis de investigación, además de brindar recomendaciones para futuras investigaciones relacionadas a este tema.
This research thesis was developed with the purpose of contributing to the study of the construction of access ramps to building’s excavations by unsupported provisional slopes analysis to guarantee the global stability factor in the Lima Conglomerate. The access ramps are provisional structures whose construction is not governed by norms or established indications, in addition it does not include a study, it is based on the experience of the person responsible for the work. The city of Lima is located on a gravelly ground which helps to optimize the degree of inclination of the provisional slopes. The scope of this work is to model an access ramp in the typical conglomerate of Lima applying the existing machinery overloads and perform an analysis of global stability against static and pseudodynamic conditions. The minimum resistance parameters characteristic of the Lima gravel, the cohesion parameter and friction angle will be estimated using the retro-analysis technique based on the Limit Equilibrium method in Slide. From this, the slopes will be optimized, evaluating the different degrees of inclination, and the deformations produced in the slopes will be estimated through the Plaxis program, based on Finite Elements. Finally, the conclusions obtained from this research thesis are presented, as well as providing recommendations for future research related to this topic.
Tesis

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Júnior, Carlos Alberto Ribeiro. "Análise numérica de escorregamento em encostas." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=5526.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O perfeito entendimento de deslizamentos de terra tem sido objeto de grande interesse na engenharia geotécnica há muitos anos. Encostas naturais representam um desafio constante para os engenheiros, mais do que os taludes artificiais. Não é incomum que os escorregamentos causam perdas de vidas humanas e também danos materiais. As informações obtidas a partir de retro-análise de casos históricos, têm servido como uma ferramenta valiosa para a compreensão da estabilidade de taludes. Vale a pena notar que o primeiro método de cálculo de estabilidade de taludes, usando divisão de fatia, foi desenvolvido após um acidente na Noruega. Métodos de estabilidade por Equilíbrio Limite, desenvolvidos no século passado são atualmente utilizados na prática da engenharia. Apesar de suas deficiências, eles provaram ser confiáveis na determinação do Fator de Segurança. A geometria 2D e a abordagem completa da condição saturada são provavelmente as questões mais relevantes dos métodos atuais. A condição do solo não saturado está geralmente presente em taludes naturais e os métodos ignoram a influência da sucção do solo sobre a estabilidade do talude. O desenvolvimento de computadores no meio do século passado, tornaram os cálculos Equilíbrio Limite fáceis de serem executados. Por outro lado, eles não podem explicar a natureza do problema ou prever o comportamento do solo antes da ruptura. A década de 1960 marcou o início do desenvolvimento de programas de computador baseados em métodos numéricos que, entre outros, destaca-se, em geotecnia, a aplicação dos métodos de Elementos Finitos (FEM). Este método é ideal para muitos fins, uma vez que permite a simulação da sequência de construção e também a incorporação de diferentes modelos constitutivos. Este trabalho mostra a influência da sucção sobre a estabilidade de encostas naturais. Uma retroanálise de um escorregamento no Morro dos Cabritos, no Rio de Janeiro, foi feita através de um programa de análise de tensão (Plaxis 2D). Os resultados foram comparados com o FS obtido por programa de Equilíbrio Limite (Slide v5). O efeito de sucção do solo foi incorporada nas análises, através de sua influência sobre os parâmetros de resistência do solo e por diferentes possibilidades de infiltração de água na encosta. Este caso histórico foi estudado anteriormente por Gerscovich (1994), que na época, fez analise de fluxo e estabilidade utilizando um abordagem de Equilíbrio Limite 3D. Os resultados mostraram boa concordância entre a análise de Elementos Finitos e a simulação de Equilíbrio Limite, sem a presença de nível de água. Os resultados confirmaram que foi necessário haver pressões positivas para explicar a ruptura do talude.

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Moura, Nícolas Rodrigues. "Contribution to the study of the effect of three-dimensional stress states to slope stability analysis." Universidade Federal de Goiás, 2018. http://repositorio.bc.ufg.br/tede/handle/tede/8904.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Análises de estabilidade de taludes são predominantemente realizadas em duas-dimensões (2D) por métodos de equilíbrio limite. Os métodos convencionais de equilíbrio limite são alvos de muitas críticas pelo o uso do equilíbrio estático, pressuposições de forças na análise e por possuir o mesmo fator de segurança ao longo de toda a superfície de deslizamento. Para superar essas deficiências, o método proposto por Kulhawy (1969) incorpora o comportamento tensão-deformação do solo com tensões oriundas do Método de Elementos Finitos (FEM) e tem a mesma estrutura dos métodos de equilíbrio dos métodos de equilíbrio de equilíbrio limite clássicos. É também chamado de método aperfeiçoado. Devido à existência de taludes com geometrias complexas, a abordagem tridimensional (3D) é a única capaz de incorporar todos os aspectos geométricos do problema. Esta dissertação é dividida em dois artigos com o tema de estabilidade de taludes pelo o método de Kulhawy em abordagens 2D e 3D. O objetivo primário dessa dissertação é avaliar os principais fatores que influenciam a estabilidade de taludes. O primeiro artigo propôs geometrias variando de convexo a côncavo em um conjunto de propriedades típicas de solos. Duas trajetórias de geração de tensões in- situ foram utilizadas, i.e., construção e escavação. O método GLE foi calculado para fins de comparação. A superfície de deslizamento é muito dependente do histórico de tensão e da forma da face do talude. A diferença relativa no estado de tensões inicial típico alcançou 15% nas análises 2D e 34% nas análises 3D. A análise de sensibilidade do efeito do Poisson no fator de segurança mostrou-se muito relevante. A relação entre os fatores de segurança 2D e 3D são quase lineares independente do estado de tensões, das propriedades de resistência, formato da face do talude, na ordem de 30 a 40%. O segundo artigo propõe análises em barragens construídas em vales estreitos. Três abordagens de análises foram utilizadas: redução de resistência ao cisalhamento (SSR), métodos de Kulhawy e GLE. Condições típicas de fundações são muito variáveis como topografia e deformabilidade. A análise de sensibilidade do módulo de fundação de Young no fator de segurança foi insignificante em 2D e relevantes em 3D. A relação entre o comprimento do aterro (W) e a altura () é uma variável representativa do grau de estreitamento da barragem e na estabilidade de taludes. A análise de deformações planas tende a altas relações W/H e o oposto mostra elevados efeitos 3D. A inclinação da ombreira mostrou-se relevante no fator de segurança apenas em aterros em vales estreitos. Fundações mais rígidas são mais beneficias para o fator de segurança devido à produção de altos efeitos de arqueamento neste cenário. O método de Kulhawy provou-se ser vantajoso pela a incorporação do comportamento mecânico do solo, o uso de tensões mais realísticas nas análises e avaliação da estabilidade local na superfície de deslizamento. Isso aumenta a quantidade de informações úteis e confiáveis para o profissional de engenharia no projeto de taludes. Todas as análises foram realizadas usando o software SoilVision Systems, Saskatchewan, Canadá. Os módulos utilizados foram o SVLOPE, SVSOLID e o SVFLUX (SoilVision Systems Ltd., 2018). A análise de tensão para a simulação de trajetórias de escavação e construção utilizou do solucionador de Equações Diferenciais Parcias (PDE) o FlexPDE 6 (PDE Solutions Inc., 2014).
Slope stability analyses are predominantly performed using the two-dimensional (2D) conventional limit equilibrium methods. Conventional limit equilibrium methods are targets of many criticisms for using static equilibrium, assumptions of forces in the analysis and the same factor of safety along the slip surface. In order to overcome these shortcomings, the method proposed by Kulhawy (1969) incorporates the stress-strain behavior of the soil with stresses from the Finite Element Method (FEM) with the same structure as limit equilibrium methods. It is also called enhanced method. Due to the existence of slopes with complex geometries, the three-dimensional (3D) approach is only able to incorporate all the geometric aspects of the problem. This thesis is divided into two papers with the subject of slope stability analyses by the Kulhawy’s method in 2D and 3D approaches. The primary objective of this thesis is to evaluate major factors that influence slope stability. The first paper proposed geometries ranging from convex to concave in a set of soil properties. Two stress paths were considered, i.e., construction and excavation. The GLE method was computed for comparison purposes. The slip surface is very dependent on the stress history and the shape of slope face. The relative difference in typical initial stress state reached 15% in 2D analyses and 34% in 3D analyses. Sensitivity analysis of effect of Poisson’s ratio on factor of safety was very relevant. The relationship between 2D and 3D factors of safety are nearly linear independent of stress state on order of 30 to 40%. The second paper propose analyses on embankment dams built in narrow valleys. Three approaches of slope stability were used: shear strength reduction (SSR), Kulhawy’s and GLE methods. The typical conditions of foundation sites are very variable as topography and deformability. Sensitivity analysis of Young’s modulus of foundation on factor of safety was insignificant in 2D and relevant in 3D analyses. The ratio between embankment length (W) and height (H) was very important on slope stability. The plane strain analysis tends to high W/H ratio and the opposite shows high 3D effects. The inclination of abutment showed to be relevant on factor of safety only in embankments in narrow valleys. Stiffer foundations are beneficial to the factor of safety due producing high arching effects in this scenario. The Kulhawy’s method proved to be advantageous by the incorporation of mechanical behavior of soil, more realistic stress and local stability evaluation on slip surface. It increases the amount of useful and reliable information to the engineering professional in design of slopes. All analyses were performed using SoilVision Systems suite software, Saskatchewan, Canada. The modules used were SVSLOPE, SVSOLID and SVFLUX (SoilVision Systems Ltd., 2018). The stress analysis for the simulation of excavation and construction trajectories used partial differential equation (PDE) solver, FlexPDE 6 (PDE Solutions Inc., 2014).

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Sitta, Martin. "Montovaná železobetonová konstrukce výrobní haly s administrativou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265275.

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As the main topic this thesis describes the design and evaluation of selected reinforced concrete members of the prefabricated reinforced concrete industrial building with administration at ultimate limit state in accordance with applicable standards. Movable overhead crane with carrying capacity of 50 tons is the main distinction of the industrial hall. Lateral frame whit main structural parts which are roof prestressed girder, load-bearing column supporting the overhead crane and drilled pile transferring loads from the upper construction to the load bearing subsoil, is designed in particular. Furthermore, design of the Gerber beam which forms the slab construction in the administrational part of the building is elaborated. Structural design and evaluation of other structures of the building is not part of this thesis.

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SHARMA, SANDEEP. "STABILITY ANALYSIS OF A HILL SLOPE IN UZAN BAZAAR GUWAHATI USING FEM AND LEM APPROACH." Thesis, 2023. http://dspace.dtu.ac.in:8080/jspui/handle/repository/20052.

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The stability analysis of natural slopes holds significant importance in geotechnical design. Both engineering consultancies and research organizations utilize various computer aided design software to address these slope stability problems. This approach provides the ability to precisely anticipate critical failure surfaces through diverse methodologies. This M.Tech thesis focuses on performing stability analysis of a natural slope located in Uzan Bazaar Guwahati Assam. There have been frequent and periodical occurrences of natural disasters in the State of Assam, viz. landslides, earthquake tremors, which not only caused lot of causalities and destruction of property, but also damage roads and infrastructures. The natural slope lies on left bank of mighty Brahmaputra River. Most of the Kharghulli Hill is covered with dense vegetation and soil cover including semi-consolidated to consolidated nature of slide cum slope debris material which consist of nala borne material second layer from top including highly to completely weathered, weak, jointed and fractured Gneisses/Schist is prone to slope failures. The Finite Element Method (FEM) based on the Shear Strength Reduction (SSR) technique offers several advantages. It enables the prediction of support elements' failure. The support elements such as micro-piles, ground anchors, geogrids, etc, as well as the calculation of factors of safety. This capability enables comprehensive analysis and assessment of the support elements, contributing to a more accurate understanding of their performance and potential failure modes. Despite these benefits, SSR has not been widely adopted for routine slope stability analysis, likely due to limited experience with the tool and the scarcity of published information regarding its accuracy. To tackle this issue, the objective of this thesis is to conduct its performance comparison with the widely employed conventional limit-equilibrium method. The findings indicate a favourable correlation between both these methods of analysis, establishing a strong level of agreement between the two approaches.

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Книги з теми "LIMIT EQUILIBRIUM METHOD (LEM)"

Huang, Yang H. Slope stability analysis by the limit equilibrium method. Reston, Virginia: ASCE Press, 2014.

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Частини книг з теми "LIMIT EQUILIBRIUM METHOD (LEM)"

Huang, Chuanzhi. "Limit Equilibrium Method." In Limit Analysis Theory of the Soil Mass and Its Application, 115–50. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1572-9_5.

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Huang, Chuanzhi. "Virtual Work Equation-Based Generalized Limit Equilibrium Method." In Limit Analysis Theory of the Soil Mass and Its Application, 151–97. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1572-9_6.

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Huang, Chuanzhi. "Generalized Limit Equilibrium Method in Plane Failure Mode." In Limit Analysis Theory of the Soil Mass and Its Application, 199–247. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1572-9_7.

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Zhang, Ke. "Integrated Karst Cave Stochastic Model-Limit Equilibrium Method." In Failure Mechanism and Stability Analysis of Rock Slope, 113–41. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5743-9_6.

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Basson, Mandeep Singh, R. Venkataraman, and G. V. Ramana. "Comparison of Slope Stability Using Smoothed Particle Hydrodynamics, Finite Element Method, and Limit Equilibrium Method." In Lecture Notes in Civil Engineering, 295–310. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6086-6_24.

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Dulanjalee, P. H. E., and Jagath Gunathilake. "Rock Slope Stability Assessment Using Stereographic Projection Method and Limit Equilibrium Analysis." In Advancing Culture of Living with Landslides, 489–98. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53485-5_58.

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Senthil, P., and Hari Dev. "Numerical Analysis of Gravity Dam-Foundation and Comparison with Limit Equilibrium Method." In Lecture Notes in Civil Engineering, 235–44. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1886-7_20.

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Zhou, Jiawen, Junye Deng, and Fugang Xu. "A Slope Stability Analysis Method Combined with Limit Equilibrium and Finite Element Simulation." In Advances in Intelligent and Soft Computing, 241–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29387-0_37.

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Chen, Hongkai, and Hongmei Tang. "Calculation Method of Stability Coefficient of Perilous Rock Based on the Limit Equilibrium Theory." In Communications in Computer and Information Science, 88–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16339-5_12.

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Wei, Haitao, Ning Jia, and Bin Jia. "Stability analysis of the foundation pit based on the three-dimensional limit equilibrium method." In Water Conservancy and Civil Construction Volume 2, 245–51. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003450832-31.

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Тези доповідей конференцій з теми "LIMIT EQUILIBRIUM METHOD (LEM)"

Saim, Noraida Mohd, and Anuar Kasa. "Comparative Analysis of Slope Stability using Finite Element Method (FEM) and Limit Equilibrium Method (LEM)." In 2023 IEEE 14th Control and System Graduate Research Colloquium (ICSGRC). IEEE, 2023. http://dx.doi.org/10.1109/icsgrc57744.2023.10215453.

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Li, X. G., and W. N. Liu. "Study on Limit Earth Pressure by Variational Limit Equilibrium Method." In GeoShanghai International Conference 2006. Reston, VA: American Society of Civil Engineers, 2006. http://dx.doi.org/10.1061/40863(195)41.

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Xu, Xue-yong, Li-qiang Zhuang, Bang-yi Hu, and Chao Li. "Stability Analysis of Suspended Dam Based on Limit Equilibrium Method." In 2022 8th International Conference on Hydraulic and Civil Engineering: Deep Space Intelligent Development and Utilization Forum (ICHCE). IEEE, 2022. http://dx.doi.org/10.1109/ichce57331.2022.10042595.

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Choudhury, Deepankar, Somdatta Basu, and Jonathan D. Bray. "Behaviour of Slopes under Static and Seismic Conditions by Limit Equilibrium Method." In Geo-Denver 2007. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40905(224)6.

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Xu, Ping, Ling-Yun Fang, and Zhi-Jun Sun. "Research on Limit Equilibrium Analysis Method of Loess Slope Considering Cross-anisotropy." In 2021 7th International Conference on Hydraulic and Civil Engineering & Smart Water Conservancy and Intelligent Disaster Reduction Forum (ICHCE & SWIDR). IEEE, 2021. http://dx.doi.org/10.1109/ichceswidr54323.2021.9656329.

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Read, John. "Three-dimensional limit equilibrium slope stability analyses, method, and design acceptance criteria uncertainties." In SSIM 2021: Second International Slope Stability in Mining Conference. Australian Centre for Geomechanics, Perth, 2021. http://dx.doi.org/10.36487/acg_repo/2135_0.01.

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Izadi, Ardavan, Reza Jamshidi Chenari, Brigid Cami, and Sina Javankhoshdel. "Full and Quasi-Stochastic Slope Stability Analyses Using Random Limit Equilibrium Method (RLEM)." In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482797.065.

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Sun, Shiguo, Yinghai Zhang, Jianqiang Wang, Zhenhua Su, and Shaojie Feng. "The Slope Comprehensive Reinforcement Design Scheme Optimization Based on the Limit Equilibrium Method." In 2015 International Symposium on Energy Science and Chemical Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/isesce-15.2015.8.

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Jiang, Jianqing, and Guolin Yang. "Strength Parameters of Red Sandstone Granular Soil Based on Three-Dimensional Limit Equilibrium Method." In Second International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41039(345)140.

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LI, Zan, Li-Xiang ZHANG, and Meng-Ying BIAN. "Based on the Finite Element Limit Equilibrium Method Analyze Earth-Rock Dam Slope Stability." In 2014 International Conference on Mechanics and Civil Engineering (icmce-14). Paris, France: Atlantis Press, 2014. http://dx.doi.org/10.2991/icmce-14.2014.156.

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