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Letteratura scientifica selezionata sul tema "Slopes (Soil mechanics)"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Slopes (Soil mechanics)"

1

Zhang, Hong, Bang Zhang, Can Wu e Kun Chen. "Macro and micro analysis on coal-bearing soil slopes instability based on CFD-DEM coupling method". PLOS ONE 16, n. 9 (17 settembre 2021): e0257362. http://dx.doi.org/10.1371/journal.pone.0257362.

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By combining the discrete element method (DEM) with computational fluid dynamics (CFD), this study proposes a three-dimensional CFD–DEM fluid–solid coupling microscopic computational model for analyzing the micromechanisms of instability and failure in a coal-bearing soil slope during rainfall. The CFD–DEM fluid–solid coupling model indicated that the main failure mode of the coal-bearing soil slopes was rainwater washing, and the slope sliding surface was predicted as an approximately linear segment. The adaptability of this numerical method was verified by comparing its results with those of rain-washed slopes in an outdoor model test. Rainfall changed the microscopic parameters such as the force chain, coordination number, and porosity of the slope soil particles. The porosity of the slope’s top particles increased from 0.35 in the initial state to 0.80 in the unstable state. This change was directly related to the macroscopic mechanics of the slope soil. By analyzing the changes in the microscopic parameters of the particles, the failure evolution law of the coal-bearing soil slopes during rainfall was explored from a microscopic perspective. This study not only provides a theoretical basis for the protection design and construction of coal-bearing soil slopes in the region but can also analyze macroscopic mechanical laws of discrete media from a micro–macro perspective in geotechnical engineering.

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2

Tan, Mengxi, e Sai K. Vanapalli. "Performance estimation of a shallow foundation on an unsaturated expansive soil slope subjected to rainfall infiltration". MATEC Web of Conferences 337 (2021): 03009. http://dx.doi.org/10.1051/matecconf/202133703009.

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In the last two decades, there has been a significant increase in infrastructure development on slopes of hilly regions of the world, due to population growth. There are many infrastructures on unsaturated expansive slopes, especially in semi-arid and arid regions. Rainfall infiltration is one of the major factors that contributes to the slope and infrastructure foundations failures on hilly slopes with unsaturated expansive soils. In the current study, a rational approach is proposed considering the combined influence of the foundation-slope behavior based on the principles of unsaturated soil mechanics. This is achieved by a novel numerical modelling approach using the commercial software Geo-studio to investigate the performance of strip foundation located on the top of the unsaturated expansive soil slope subjected to various rainfall infiltration conditions. Hydro-mechanical coupling analysis is conducted to evaluate the rainfall water infiltration influence combined with slope stability analysis using limit equilibrium method. Comparisons are made between both the foundation bearing capacity, slope stability before and after rainfall water infiltration. Different failure mechanisms of the foundation and slope system are presented with and without foundation loading for various rainfall scenarios. Results summarized in this paper are helpful for the geotechnical engineers for understanding the performance of shallow foundations on unsaturated expansive soil slopes considering the influence of rainfall infiltration conditions.

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3

Chen, Bozhou, Wei Shui, Yuanmeng Liu e Ruyue Deng. "Analysis of Slope Stability with Different Vegetation Types under the Influence of Rainfall". Forests 14, n. 9 (13 settembre 2023): 1865. http://dx.doi.org/10.3390/f14091865.

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Rainfall-prone shallow landslides account for one-fifth of the global land area, and rainfall is critical to the mechanics and hydrology of shallow slopes. In typical geological disaster-prone areas, the hydrodynamic responses of slopes with different vegetation types under rainfall conditions require further study. The purpose of this study was to analyze the hydraulic stability of soils with different vegetation types under rainfall conditions and their effects on slope stability. Thus, the soil–water characteristic curves and water-stable aggregate characteristics of soils with three vegetation types were analyzed. A two-dimensional finite element model was used to simulate the slope stability of extreme rainfall environments with different rainfall durations. The results showed that the matric suction of soil with trees was less affected by rainfall with a better stability of water-stable aggregates than that of soil with shrubs and grass. The plastic strain cloud map showed that the maximum plastic strain occurred at the toe of the slope. In addition, the potential slip depth of slopes with trees was smaller than that of slopes with shrubs and grass. Under the two rainfall durations, the factor of safety (FoS) of slopes with trees changed by 0.06, whereas that of slopes with shrubs and grass changed by 0.1. The findings of this study provide valuable insights into changes in the stability of slopes with different vegetation types under varying rainfall conditions. It is of great significance to provide a scientific basis for the application of ecological measures in the prevention and control of mountain disasters and guide the implementation of appropriate land management measures.

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4

Ma, Kuo-Chen, Yong-Jun Lin, Shyh-Yuan Maa e Yih-Chi Tan. "Evaluation of the effect of hysteretic flow and root system on shallow landslide". Soil Research 50, n. 7 (2012): 616. http://dx.doi.org/10.1071/sr12104.

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This paper analyses the mechanics of slope stability with regard to the hysteretic flow of unsaturated soil and the root system of the covering vegetation. The hysteresis of the soil water retention curves and root strength are important factors in the evaluation of unsaturated shear strength. Engineers should consider how the transportation of the soil water content and the plant root strength influence evaluation of surficial slope stability analysis. The integrated slope stability analysis considering the hysteretic flow and root strength were calculated on variations of the safety factor (SF) and in accordance with different infiltration profiles and several species of vegetation. The results show that it is possible to predict shallow landslide on unsaturated slopes covered by different vegetation types. Tree planting, in combination with mechanical reinforcement, on the slope’s toe was found to improve stability, in addition to having economic benefits. This process allows for the selection and comparison of combinations and densities of vegetation types, in order to find the optimum location for increased SF. This will quickly improve shallow slope stability before it is destroyed. A better understanding of the process mechanics, as provided by the model, is critical for a reliable and appropriate design for slope stabilisation.

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5

Darban, Reza, Emilia Damiano, Aldo Minardo, Lucio Olivares, Luciano Picarelli e Luigi Zeni. "An Experimental Investigation on the Progressive Failure of Unsaturated Granular Slopes". Geosciences 9, n. 2 (29 gennaio 2019): 63. http://dx.doi.org/10.3390/geosciences9020063.

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Slope failure is a complex process which depends on several factors concerning nature and properties of soil, slope morphology and structure, past stress history, groundwater regime, boundary conditions, and their changes. As a consequence, the mechanism of slope failure is typically characterized by the development of a highly non-uniform strain field, which does not allow an easy prediction of the failure conditions. Usually, the process which will bring the slope to final collapse starts with local soil failure, which then leads to formation and propagation of a shear zone, and finally to general slope failure. This mechanical process is called progressive failure. However, in spite of the progresses in the knowledge of the slope behavior, a complete framework about the progressive failure is still missing; in particular, information about the response of granular unsaturated sloping soils is very poor. This paper reports the results of a couple of small-scale experiments on slopes reconstituted with unsaturated pyroclastic soils and subjected to continuous rainfall. The use of miniaturized sensors and optical fibers provided useful data to read some aspects of the mechanics of failure.

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6

Hunter, Gavan, e Robin Fell. "Travel distance angle for "rapid" landslides in constructed and natural soil slopes". Canadian Geotechnical Journal 40, n. 6 (1 dicembre 2003): 1123–41. http://dx.doi.org/10.1139/t03-061.

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"Rapid" landslides in constructed and natural soil slopes have the potential to cause loss of life, destruction of property, and damage to the natural environment because the velocity of the slide mass is such that persons in the travel path do not have time to evacuate and the kinetic energy is such that even small landslides can severely damage buildings and other structures. This paper presents methods for prediction of the post-failure travel distance for "rapid" landslides from constructed cut and fill slopes and natural soil slopes derived from a database of some 350 "rapid" landslides in predominantly soil slopes. The characteristics of soils, both dilative and contractive on initial shearing, and the slope conditions for which landslides are susceptible to development into slides of "rapid" post-failure velocity are discussed. Methods for estimating the travel distance angle of the post-failure travel of the slide mass have been developed and are based on consideration of the failure mechanics of the initial slide (whether contractive or dilative on initial shearing), the type of slope, the slide volume, the geometry of the slope at and below the slide source area, and the degree of confinement of the travel path of the landslide.Key words: "rapid" landslide, flow slide, debris flow, debris slide, travel distance angle, failure mechanism.

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7

Mburu, Joram Wachira, An-Jui Li, Horn-Da Lin e Chih-Wei Lu. "Investigations of Unsaturated Slopes Subjected to Rainfall Infiltration Using Numerical Approaches—A Parametric Study and Comparative Review". Sustainability 14, n. 21 (3 novembre 2022): 14465. http://dx.doi.org/10.3390/su142114465.

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In the past 30 years, research on rainfall-induced landslides has grown remarkably. The contribution of matric suction to soil strength and the physics of water flow in unsaturated soils are widely accepted phenomena among researchers. However, the adoption of unsaturated soil mechanics in geotechnical engineering practice has been relatively slow, in part due to the practicality of design solutions available to the engineer. This paper conducts a parametric study on unsaturated silty slopes under a vertical steady flow rate to identify the suitable slope and hydrologic conditions to incorporate unsaturated conditions for preliminary stability analysis. Notably, the contribution of suction is most significant for silt/clay slopes with a water table located below the mid-height of the slope. For slopes with slope height ≥20 m and a fairly high water table, the slope height is a primary controlling factor of slope stability. Two case studies based on distinct failure mechanisms are presented to review the application of common geotechnical software in rainfall seepage and stability analyses of unsaturated slopes. Focus is placed on the pre-failure and failure stages of each case study. The slip surface search method, failure mode, and coupling approach integrated into each computer program caused notable differences in output results.

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Wang, Lei, Yongsheng Yao, Jue Li, Kefei Liu e Fei Wu. "A State-of-the-Art Review of Organic Polymer Modifiers for Slope Eco-Engineering". Polymers 15, n. 13 (29 giugno 2023): 2878. http://dx.doi.org/10.3390/polym15132878.

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In slope ecological restoration projects, reinforcing soil and promoting vegetation growth are essential measures. Guest soil spraying technology can be used to backfill modified soil and vegetation seeds onto the slope surface, resulting in successful ecological restoration. The use of organic polymer modifiers to reinforce soil has several benefits, such as high strength, effective results, and low pollution levels. Organic polymer soil modifiers can be divided into two categories: synthetic polymer modifiers and biopolymer modifiers. This paper provides a thorough review of the properties and interaction mechanisms of two types of polymer modifiers in soil consolidation. The properties of organic polymer modifiers make them applicable in soil and vegetation engineering on slopes. These modifiers can enhance soil mechanics, infiltration, and erosion resistance and promote vegetation growth. Therefore, the suitability of organic polymer modifiers for soil and vegetation engineering on slopes is demonstrated by their properties and potential for improvement in key areas. Furthermore, challenges and future prospects for slope protection technology using organic polymer modifiers are suggested.

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9

A. N. Pluhin, L. V. Trikoz, O. S. Herasimenko, A. A. Pluhin, D. A. Pluhin e Al. A. Pluhin. "The development of some aspects of colloid chemistry and physicochemistry mechanics of disperse systems and materials are used in stability slopes". Science and Transport Progress, n. 39 (25 dicembre 2011): 150–56. http://dx.doi.org/10.15802/stp2011/6904.

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In the article the motive force of the movement the particles in dispersed systems, which include soils, when load is just sole weight of the array was investigated. It is shown that the shearing force of the weight of the soil and the specific cohesion which taken into account in calculating the stability of slopes of embankments and landslides on the slopes, much less than real. The calculations showed that the electrophoretic mechanism is a very real explanation of the observed sliding the upper part of the slope.

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Lade, Poul V. "The mechanics of surficial failure in soil slopes". Engineering Geology 114, n. 1-2 (giugno 2010): 57–64. http://dx.doi.org/10.1016/j.enggeo.2010.04.003.

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Più fonti

Tesi sul tema "Slopes (Soil mechanics)"

1

Dwyer, Todd Douglas. "Development of a physical slope failure model /". free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1421132.

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Chen, Ting. "Slope failure probability based on performance history in Hong Kong /". [Hong Kong] : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13671741.

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3

Zhan, Liangtong. "Field and laboratory study of an unsaturated expansive soil associated with rain-induced slope instability /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20ZHAN.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 471-490). Also available in electronic version. Access restricted to campus users.

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4

Malasavage, Nicholas Eugene Wartman Joseph. "Post-seismic displacement response in normally consolidated clay slopes /". Philadelphia, Pa. : Drexel University, 2010. http://hdl.handle.net/1860/3202.

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5

Kwok, Sabastein Yih Feng. "Stochastic analysis of coupled surface and subsurface flow model in steep slopes for slope stability analysis /". View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20KWOK.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 201-205). Also available in electronic version. Access restricted to campus users.

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6

Ho, Mei Yung. "Governing parameters for stress-dependent soil-water characteristics, conjunctive flow and slope stability /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20HO.

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Abifadel, Nassim Riyad 1964. "Application of Powell's conjugate direction method to slope stability analysis". Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276652.

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Slope stability problems often arise in construction engineering projects. They are major problems in dams construction and mines excavation. For the purpose of improving the efficiency of slope stability analysis, the optimization method suggested by Powell (1964) is used to locate the critical failure surface. The reader should bear in mind the possibility of applying optimization to a wide variety of different civil engineering problems.

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Zhang, Jie. "Characterizing geotechnical model uncertainty /". View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202009%20ZHANG.

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Cheung, Wai Man. "Methodology for updating cut slope reliability based on observed performance /". View abstract or full-text, 2003. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202003%20CHEUNGW.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 154-164). Also available in electronic version. Access restricted to campus users.

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10

Chandler, Douglas Scott. "An area approach to forest slope stability /". Thesis, Connect to this title online; UW restricted, 1992. http://hdl.handle.net/1773/10181.

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Più fonti

Libri sul tema "Slopes (Soil mechanics)"

1

Bromhead, E. N. The stability of slopes. Glasgow: Surrey University Press, 1986.

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2

Bromhead, Eddie. The stability of slopes. 2^a ed. London: New York, 1992.

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3

Keith, Menzies Bruce, e Matthews M. C, a cura di. A short course in soil and rock slope engineering. Tonbridge, Kent, England: Thomas Telford, 2001.

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4

Šály, Rudolf. Svahoviny a pôdy Západných Karpát. Bratislava: Veda, vydavatel̕stvo Slovenskej akadémie vied, 1986.

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5

Abdul Wahed Dato' Hj. Rahim e Abdul Wahed Dato' Hj. Rahim. Slopes made simple. [Kelana Jaya, Selangor: Eco-environmental Sdn. Bhd., 2009.

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6

W, Abramson Lee, a cura di. Slope stability and stabilization methods. 2^a ed. New York: Wiley, 2002.

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7

Arkin, Yaacov. Geotechnical factors influencing marl slopes. Jerusalem: Geological Survey of Israel, 1986.

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8

Mitchell, James Kenneth. Reinforcement of earth slopes and embankments. Washington, D.C: Transportation Research Board, National Research Council, 1987.

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Mitchell, JamesK. Reinforcement of earth slopes and embankments. Washington, D.C: Transportation Research Board, National Research Council, 1987.

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10

Mathieu, Jean-Marie. L' ingénierie des coupes de roc et le prédécoupage: Théorie et cas pratique. [Québec]: Gouvernement du Québec, Ministère des transports, 1989.

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Più fonti

Capitoli di libri sul tema "Slopes (Soil mechanics)"

1

Craig, R. F. "Stability of Slopes". In Soil Mechanics, 71–77. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4899-3772-8_9.

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2

Aysen, A. "Stability of Earth Slopes". In Problem Solving in Soil Mechanics, 139–60. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203741986-9.

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3

Scott, C. R. "Stability of slopes". In An Introduction to Soil Mechanics and Foundations, 251–87. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4899-7250-7_10.

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4

Sun, J. P., Q. Q. Liu e J. C. Li. "Effects of Rainfall Infiltration on the Stability of Soil Slopes". In New Trends in Fluid Mechanics Research, 459–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_148.

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5

El Bouanani, Latifa, Khadija Baba e Latifa Ouadif. "Use of the Method of Concrete Lozenges to Strengthening the Slopes Stability: Assessment of the Safety Factor by the Finite Element Method". In Contemporary Issues in Soil Mechanics, 123–32. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01941-9_10.

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6

Machaček, Jan, Carlos Eduardo Grandas Tavera e Theodoros Triantafyllidis. "Coupled Numerical Simulations for Seismic Hazard Assessment of Large Opencast Slopes". In Recent Developments of Soil Mechanics and Geotechnics in Theory and Practice, 237–64. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-28516-6_13.

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Krabbenhoft, Sven, Lars Damkilde e Kristian Krabbenhoft. "Effect of slope height and horizontal forces on the bearing capacity of strip footings near slopes in cohesionless soil". In Insights and Innovations in Structural Engineering, Mechanics and Computation, 2072–76. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-343.

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8

Wu, Lizhou, e Jianting Zhou. "Slope Stability Analysis Based on Analytical and Numerical Solutions". In Rainfall Infiltration in Unsaturated Soil Slope Failure, 105–30. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9737-2_5.

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AbstractInfiltration into soil slopes is a fundamental concern in civil engineering. Rainfall infiltration leads to changes in pore-water pressure and reduces matric suction in soils, making it one of the main triggers of slope failure (Ali et al. in Comput Geotech 61:341–354, 2014; Wu et al. in Hydro-mechanical analysis of rainfall-induced landslides. Springer, 2020). Slope instabilities caused by water infiltration are called rainfall-induced landslides (Xu and Zhang in Landslides 7:149–156, 2010; Wu et al. in Hydro-mechanical analysis of rainfall-induced landslides. Springer, 2020).

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Noor, M. J. Md, M. A. Saidin e S. M. Tahir. "Effectiveness of Hybrid Anchor Soil Nails in Stabilizing Slopes and Stability Assessment Based on Mechanics". In Landslide Science for a Safer Geoenvironment, 707–13. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05050-8_109.

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Karunarathna, Sandaruwan, Priyantha Bandara, Satoshi Goto e Sajith Bandaranayake. "Identification of Potential Natural Slope Failure Zones by Geomorphological Analyses Using Raster Slope Shading of LiDAR; Case Study from Kegalle, Sri Lanka". In Progress in Landslide Research and Technology, Volume 3 Issue 1, 2024, 363–77. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55120-8_26.

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AbstractThere are three approaches to defining the potential instability zonation of natural slopes. The first approach is to understand the failure mechanism through soil properties in a slope, and the mechanisms of failure and movement. The second approach aims to understand the tendency of slopes to fail, with terrain factors that form the essential characteristics of slopes. Understanding the spatial distribution of slope failures and their patterns on a particular slope is the third approach and the focus of this research. All approaches require field verification with expert knowledge.Slope failure zones contain unique topographic patterns that can be used to identify the failure shape and its dimensions. Slope failures are one of many natural denudation processes. Most slope failure landform units, considered as past slope failures tend to expand naturally. If there is no human involvement, zones of past natural slope failure can be also categorized as potential zones of future slope failure. The large-scale geomorphological analysis is the best approach for clearly identifying landform units associated with potential zones of slope failures. The best scale is 1:10,000. Two-dimensional or three-dimensional raster interpretation of slopes can be used to visualize more clearly the actual shape of slope failures. For the study, raster geomorphological mapping uses LiDAR survey data to characterize the landform units of slope failures and to prepare a landslide susceptibility evaluation.

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Atti di convegni sul tema "Slopes (Soil mechanics)"

1

Bakhtiyar, Khusanov, Normatov Shovkat e Khaydarova Ozodaxon. "On one method for assessing the soil slopes stability". In INTERNATIONAL CONFERENCE ON ACTUAL PROBLEMS OF APPLIED MECHANICS - APAM-2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0119155.

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Franco, M. A., J. Potter e B. J. Ross. "Quantifying the Variability in Interpretation of Shear Testing of a Natural Fracture". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0806.

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ABSTRACT The shear strength of discontinuities (e.g., joints, bedding planes, faults) plays an important role in the mechanical behavior of a rock mass and is crucial to the analysis and design of rock slopes. The shear strength of natural discontinuities is typically determined by performing a series of direct shear tests. Several sources of variability in direct shear test results are recognized by the geotechnical community (e.g., the inherent variability of shear strength in a rock mass, joint roughness), but the effect of variations in testing equipment, testing methods, and in the interpretation and application of test results has been little studied. The focus of this paper is the potential variance introduced by the interpretation of direct shear test results. The authors explore potential variation in a single direct shear test by examining test results from a natural joint with four different approaches. Potential future research paths are also discussed. BACKGROUND The direct shear test (DST) is widely used to determine the shear strength of natural discontinuities in rock and soil. This determination is of particular importance when designing rock-based engineering structures and assessing failures. Direct shear tests are performed using a shear box apparatus that maintains a constant force normal to the discontinuity while applying an increasing shear force parallel to the discontinuity (ASTM, 2016). The information recorded includes the applied normal force, displacement of the top of the specimen in relation to the bottom, the shear force applied to achieve that displacement, and fracture roughness. The test is generally performed three to four times with increasing applied normal loads, resulting in a set of traces corresponding to the applied normal forces. Figure 1 illustrates an idealized trace resulting from a direct shear test. Recorded forces are then converted to stresses by dividing by the surface contact area measured at the time of the test. Two parameters are calculated based on the trace data described above (ASTM, 2016): • Peak shear strength is associated with the maximum shear stress value along a sheared surface attained during a test. • Residual shear strength is associated with the point at which the shear stress remains essentially constant with increasing shear displacement.

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Fredj, Abdelfettah, e Aaron Dinovitzer. "Pipeline Response to Slope Movement and Evaluation of Pipeline Strain Demand". In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33611.

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Pipelines installed on active slopes can be exposed to slope failure mechanisms. The soil movement can introduce substantial axial and bending strains on buried pipeline, and possibly damage. The techniques to predict pipeline displacements, loads, stress or strains are not well described in design standards or codes of practice. The practice of using finite element analysis of soil-pipe interaction has developed in recent years and is proving to be a useful tool in evaluating the pipeline behavior in response to slope movement. A description of advanced pipe soil interaction modeling tools and their validation against full scale trails has been previously presented. This paper describes the ongoing work involved in a study investigating the mechanical behavior of buried pipelines interacting with active slope movement and evaluation of pipeline strain demand. Detailed pipe-soil interaction analyses were completed with a 3D continuum SPH (Smooth Particle Hydrodynamic) model to examine the pipeline behavior and evaluate the pipeline strain demand in relation to key parameters. This includes the effect of soil movement mechanism, pipeline geometry (D/t), material grade, pipeline burial depth and soil conditions and properties. Sample results of the application of the validated 3D continuum modeling process will be presented. The strain demand determined from the analyses were compared with calculated CSA-Z662 strain limit design, local FEA analyses and BS 7910. These results are being used to develop generalized trends in pipeline response to slope movements.

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Kanitz, Manuela, e Juergen Grabe. "Influence of Suction Dredging on the Failure Mechanism of Sandy Submarine Slopes: Revisited With a Coupled Numerical Approach". In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95151.

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Abstract The installation of shallow foundation systems for offshore wind turbines like gravity foundations requires the excavation of the weak top soil of the seabed to place the structure on more stable ground. This excavation can be done through suction dredging resulting in a pit. Different slope angles of this pit can be realized using this technique. As the failure mechanisms of artificial submarine slopes using suction dredging are barely investigated, relatively small final slope angles of max. 10 degree are reached to guarantee stability. Nevertheless, small-scale experiments show that submarine slopes with overcritical slope inclinations can be stable for a while when prepared with suction dredging. Steeper inclinations would significantly reduce the disturbance of the marine fauna and the amount of sand to be removed and therefore meet both economic and ecological interests. The investigations of the failure mechanism in the submarine slope during suction dredging are carried out with a coupled Euler-Lagrange approach, namely the combination of the Computational Fluid Dynamics (CFD) and the Discrete Element Method (DEM). This method enables the computation of particle-particle as well as the fluid-particle interaction forces and hence their influence on the investigated submarine slope behavior. The calculations are carried out with the open source software package CFDEM® coupling, which combines the discrete element code LIGGGHTS® with CFD solvers based on OpenFOAM®. Additionally, small scale model tests of suction dredging of sandy submarine slopes are carried out. The displacement of the soil grains is monitored with a high-speed camera. To take into account effects of contractancy and dilatancy, a loosely and a densely packed sand are investigated and the influence of the packing density on the failure mechanism is evaluated. The experimentally gained results will be compared to the numerical ones to evaluate the capability of the coupled CFD-DEM method to depict the failure behavior of submarine slopes during suction dredging.

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Liu, Xian, Guotao Ma, Mohammad Rezania, Xueyou Li, Shuihua Jiang e Mohaddeseh Nezhad. "Comprehensive post-failure analysis of rainfall-induced landslides subjected to various rainfall patterns". In UK Association for Computational Mechanics Conference 2024. Durham University, 2024. http://dx.doi.org/10.62512/conf.ukacm2024.070.

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Rainfall infiltration presents a significant hazard to slope stability in various global regions. While most previous researches focus on the variations in the factor of slope safety under rainfall infiltration, there is a notable lack of attention to post-failure behaviors of slopes, e.g., the large deformation of slopes triggered by rainfall is often ignored. This is due to the traditional slope stability analysis methods, such as the limit equilibrium method (LEM) and finite element method (FEM), struggle with modeling large deformation of soils. Moreover, the impact of rainfall patterns on the post-failure behaviors of rainfall slopes remains unexplored. To address these issues, this study proposes a new effective coupled method to quantify the postfailure behaviors of landslides affected by different rainfall patterns, employing a combination of FEM and the Generalized Interpolation Material Point (GIMP) method. The results show that the slope failure times for different rainfall patterns are 14 h (uniform), 14 h (advanced), 4 h (delayed), 9 h (intermediate), and 11 h (intermittent), with corresponding runout distances of 2.76 m, 2.95 m, 2.06 m, 2.31 m, and 2.55 m, respectively. Analyzing the large deformation analysis of rainfall-induced landslides can offer new insights to quantitatively identify post-failure features of such disasters.

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Liu, Si-hong. "Failure Mechanism of Granular Soil Slopes". In 12th Biennial International Conference on Engineering, Construction, and Operations in Challenging Environments; and Fourth NASA/ARO/ASCE Workshop on Granular Materials in Lunar and Martian Exploration. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41096(366)359.

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Kaminski, Pauline, Jürgen Grabe, Thore F. Sager e Morelia Urlaub. "Decline in Slope Stability as a Consequence of Gassy Soil in Submarine Slopes on the Balearic Promontory". In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-81151.

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Abstract Submarine landslides can entail a substantial hazard for offshore infrastructure as they are capable of triggering tsunamis and may develop into highly mobile turbidity currents capable of breaking seabed cables. Despite considerable research activity, the trigger mechanisms for such landslide events cannot be clearly defined. Recently, marine gas occurrence has been investigated as a possible trigger mechanism. The behaviour of a fine-grained gassy soil is influenced by a variety of micromechanical processes; amongst destructuring due to fracture formation or gas bubble expansion, and bubble flooding with subsequent cavity collapse. Capturing and modeling these processes in order to assess the destructive potential of enclosed gas bubbles in submarine slopes is to date a considerable scientific challenge. With the help of a large number of Finite Element Limit Analyses (FELA), which are based on laboratory tests on a gravity core from the western Mediterranean Sea, submarine slope stability in the respective region was evaluated. Based on these analyses, gassy soil can be defined as a preconditioning factor but not as a capable trigger mechanism for submarine landsliding.

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Peng Li, Xiang Zhang e Zhan-bin Li. "Experimental study on soil erosion process on the slopes of different soils texture". In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5987655.

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NIKOLAOS, ALAMANIS, e DAKOULAS PANOS. "Effect of spatial soil variability incline of slopes and seismic stimulation on permanent seismic slope displacement". In Sixth International Conference on Advances in Civil Structural and Mechanical Engineering CSM 2018. Institute of Research Engineers and Doctors, 2018. http://dx.doi.org/10.15224/978-1-63248-150-4-25.

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Biscontin, Giovanna, e Juan M. Pestana. "Seismic Response of Submarine Slopes". In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37500.

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The geological profile of submerged slopes on the continental shelf typically includes soft cohesive soils with thicknesses ranging from a few meters to tens or hundreds of meters. The response of these soils in simple shear tests is largely influenced by the presence of an initial consolidation shear stress, inducing anisotropic stress-strain-strength properties which depend also on the direction of shear. In this paper, a new simplified effective-stress-based model describing the behavior of normally to lightly overconsolidated cohesive soils is used in conjunction with a one-dimensional seismic site response analysis computer code to illustrate the importance of accounting for anisotropy and small strain nonlinearity. In particular, a simple example is carried out to compare results for different slope inclinations. Depth profiling of the maximum shear strains and permanent deformations provide insight into the mechanisms of deformation during a seismic event, and the effects of sloping ground conditions.

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Rapporti di organizzazioni sul tema "Slopes (Soil mechanics)"

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Honegger, Wijewickreme e Monroy. L52325 Assessment of Geosynthetic Fabrics to Reduce Soil Loads on Buried Pipelines - Phase I and II. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), dicembre 2011. http://dx.doi.org/10.55274/r0010398.

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High soil loads on buried pipelines can lead to unacceptably high pipeline strains developed in response to permanent ground displacement. Common causes of permanent ground displacement are related to slope instability as a result of heavy precipitation or ground subsidence. In addition, several permanent ground displacement hazards are related to earthquakes including surface fault displacement, triggered landslide movement, surface ground settlement related to liquefaction, and lateral spread displacement. Result: Four specific areas of investigation were completed: 1.Performed baseline tests in moist sand to confirm minimal difference in horizontal soil restraint between moist and dry sand. 2.Performed tests to gauge the variation in horizontal load reduction with separation between the pipe and an inclined trench wall lined with two layers of geotextile. 3.Performed tests in compacted 19 mm (0.75 in) minus sand and crushed limestone (referred to locally in British Columbia as road mulch) to attempt to provide larger difference between horizontal forces developed with and without lining a trench wall with geotextile. 4.Performed tests to attempt to confirm oblique horizontal-axial soil restraint behavior reported in small-scale tests and centrifuge tests. Benefit: Rather than undertake further physical testing to better understand how the presence of single or dual layers of geotextile fabric changes the mechanisms by which soil restraint develops for horizontal ground displacement, future efforts should focus on numerical simulation preferably using discrete element methods. Until full-scale test data are available to confirm consistent prediction of oblique horizontal-axial soil restraint, the practice of treating horizontal and axial soil springs independently in the analysis of buried pipeline response to ground displacement, as is the current practice, should be maintained.

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