Dissertations / Theses on the topic 'Excavations'
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Spangler, Philip. "Excavations." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406140330.
Full textGoessling, Sybil Elizabeth Hatch. "Interactive design of braced excavations." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45728.
Full textMaster of Science
Shao, Yong C. "Information feedback analysis in deep excavations." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20055.
Full textRizkalla, Maged Kamal. "Elasto-viscoplastic modelling of rock excavations." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60595.
Full textA 2-dimensional elasto-viscoplastic finite element model for stress/stability analysis of mining excavations has been developed for use on microcomputers. An iterative explicit time stepping scheme is implemented. The program uses automatic time-step calculator based on equations giving a limit on the time step in an attempt to prevent numerical instability when common forms of isotropic yield functions and plastic potentials are used in the viscoplastic solution. When the input data are read parallel to the analysis undertaken the user can simulate compound behaviour by stopping the analysis, examining the results graphically and restarting it again and possibly implementing a certain decision in the subsequent appended input. This also imposes no limit on the number of time stations at which instantaneous changes like elements cut, elements backfilled, loads added or simply outputs are required. The program is equipped with graphical pre- and post- processors.
Easton, Donald Fyfe. "Schliemann's excavations at Troy, 1870-1873." Thesis, University College London (University of London), 1989. http://discovery.ucl.ac.uk/1317763/.
Full textSPRINGER, FERNANDA OTTO. "DEFORMABILITY ANALYSIS OF SOIL NAILING EXCAVATIONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2001. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1983@1.
Full textA utilização de inclusões passivas para reforços de solos, técnica comumente conhecida como solo grampeado, vem tendo aceitação crescente junto a profissionais de engenharia civil, em especial no Rio de Janeiro. Esta técnica, porém, carece de um estudo detalhado sobre a influência dos parâmetros relevantes na deformabilidade de maciços grampeados. Os grampos são inclusões rígidas, instaladas suborizontalmente, sem tensão ou trecho livre, pois as barras de aço são introduzidas em um furo preenchido com calda de cimento. As forças axiais nos grampos são obtidas através da descompressão lateral causada pela escavação do solo. O grampeamento é feito na massa de solo à medida que escavações são executadas em etapas, obtendo se uma zona reforçada que atua como suporte da massa de solo posterior, sem reforço. A face frontal da escavação é usualmente protegida por concreto projetado, sem funções estruturais. Esta pesquisa objetiva avaliar a influência dos diversos parâmetros geotécnicos e geométricos no comportamento tensão deformação de escavações grampeadas com face vertical e superfície do terreno horizontal. A análise paramétrica foi realizada pelo FLAC (Fast Lagrangian Analysis of Continua) que é um programa computacional baseado no método das diferenças finitas. Este programa simula o comportamento bidimensional de estruturas reforçadas, constituídas de solo e ou rocha, que possam ser submetidos a escoamento plástico quando o limite de resistência é atingido. Os resultados mostram que o módulo de Young (E) e a coesão do solo (c) são de grande relevância para o projeto de estruturas grampeadas. Adicionalmente, as análises indicam que a resistência ao cisalhamento na interface solo-grampo (qs) é também um parâmetro importante, particularmente nos casos com grampos de comprimento (L) inferior a 80 por cento da profundidade de escavação (H) (L/H < 0,80). Recomenda-se que o valor de qs seja determinado diretamente a partir de ensaios de arrancamento no campo. No que se refere à inclinação dos grampos, os resultados mostram que não há diferenças significativas nos deslocamentos do maciço reforçado para lambda menor ou igual a 10 graus. Estes resultados são particularmente interessantes do ponto de vista de execução, pois inclinações da ordem de 10 graus facilitam os procedimentos de injeção no campo. Os resultados obtidos nesta pesquisa indicam o uso de comprimentos de grampos maiores que 70 por cento da altura de escavação (L/H > 0,70) na técnica do solo grampeado.
The use of passive inclusion for soil reinforcements, technique usually known as soil nailing, has been gaining growing acceptance within civil engineering professionals,especially in Rio de Janeiro. However this technique lacks a more detailed study on the elevant parameters influencing the deformability of soil nailed masses. The nails are rigid inclusions, sub horizontally positioned, without tension or free space between the nail and the surrounding soil mass. The axial forces on the nails are developed due to lateral decompression caused by soil excavation. As the excavation stages proceed, the nails are successively being installed, producing a reinforced zone, which acts as a support for the soil mass. The frontal face of the excavation is usually protected by shotcrete, and has no structural functions. This research aims at evaluating the influence of the various geotechnical and geometric parameters on the stress strain behavior of nailed excavations, with vertical face and horizontal soil surface. The parametric analysis was performed using FLAC (Fast Lagrangian Analysis of Continua), which is a computer program based on the finite difference method. This program simulates bi dimensional behavior of reinforced structures of soils and or rocks,which may be submitted to plastic flow when the strength limit is reached. The results show that the Youngs modulus (E) and soil cohesion (c ) have a very significant influence on the displacement of a soil nailing structure. The analysis also indicates that the mobilized shear strength at the soil nail interface (qs) is also an important parameter, particularly for nail lengths (L) smaller than 0,80 of the excavation height (H) (L/H < 0,80). It is therefore recommended that qs be directly determined by pullout in situ tests. Regarding nail inclination the results suggests no significant influence on the reinforced soil mass displacement for alpha less or equal than 10 degrees. These results are particularly relevant for engineering practice, because a 10 degrees inclination facilitates grouting injections in the field. The results in this research indicates the use of nail lengths (L) greater than 0,70 of the excavation height (H) (L/H greater than 0,70) in soil nailing technique.
Whelan, Michael P. (Michael Paul) 1968. "Performance of deep excavations in Boston." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37790.
Full textHashash, Youssef M. A. "Analysis of deep excavations in clay." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13199.
Full textBentler, David J. "Finite Element Analysis of Deep Excavations." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30767.
Full textPh. D.
Xia, Huanliang. "An analysis for braced excavations in clay." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0010/NQ42487.pdf.
Full textAbela, Jeanette Mireille. "Blinding Struts in Cut-and-Cover Excavations." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511839.
Full textBatten, Melanie. "Prop loads in two large braced excavations." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242719.
Full textHsiung, Bin-Chen. "Engineering performance of deep excavations in Taipei." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393013.
Full textNOGUEIRA, CHRISTIANNE DE LYRA. "NON LINEAR ANALYSIS OF EXCAVATIONS AND EMBANKMENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1998. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2136@1.
Full textO principal objetivo desta tese consiste no desenvolvimento e aplicação de um programa computacional, ANLOG (Análise Não Linear de Obras Geotécnicas), para análises de problemas geotécnicos com acoplamento de fluxo e deformação, e considerando relações constitutivas não lineares na modelagem do solo. A nível global, a solução do sistema de equação não linear originado da formulação via MEF deste problema é feita através do método de Newton-Raphson Modificado com incrementos automáticos de carga e tempo. Enquanto que, a nível local, a equação constitutiva é integrada utilizando-se um algoritmo de integração de tensão explícito com subincrementos. Modelos não lineares elástico (hiperbólico) e elastoplásticos (Camclay Modificado, Lade e Lade-Kim) são utilizados para representar o comportamento tensão-deformação-resistência do solo. As metodologias de ligar a gravidade e a proposta por Brown e Booker (1985) são usadas para simular numericamente, respectivamente, aterros e escavações. Análises preliminares de aterros e escavações são apresentadas nas quais pode-se observar que a resposta é função do tempo e altamente dependente do coeficiente de permeabilidade e da velocidade de solicitação. As situações drenada e não drenada são casos particulares de uma análise acoplada. Com respeito ao emprego da técnica de incremento automático de carga e tempo mostra-se que sua utilização é fundamental para definição do tamanho do incremento mais adequado a ser adotado na solução incremental-iterativa. Quanto ao algoritmo de integração de tensão adotado é mostrado que o erro cometido na verificação da condição de consistência diminui exponencialmente com o aumento do número de subincrementos. Por fim, o programa ANLOG é utilizado para análise da escavação experimental de Camboinhas (Silva, 1979). Comparações entre os deslocamentos numéricos e os de campo apresentam uma razoável concordância. Entretanto, as poro- pressões numéricas variam em torno de 10 por cento a 30 por cento do valor inicial, enquanto que no campo essa variação foi menor que 3 por cento.
The main objective of this thesis consists on the development and application of a computational program, ANLOG (Non Linear Analysis of Geotechnical Constructions), to analyse geotechnical problems coupling flow and deformation, and considering constitutive non-linear relations for the soil modelling.At the global level, the solution of the non linear system of equations, generated by the FEM formulation of this problem, is done using the Newton-Raphson Modified method with automatic load and time increments. On the other hand, at the local level, the constitutive equations are integrated using the explicit algorithm of stress integration with sub steps. Non-linear models, elastic (hyperbolic) and elastoplastic (modified Camclay, Lade and Lade-Kim) are utilised to represent the stress-strain-strength behaviour of the soil. The procedures of turn on gravity and the one proposed by Brown and Booker (1985) are used to simulate numerically, respectively, embankments and excavations.Initial analyses of excavations and embankments are performed in which it can be observed that the response is a function of time and depends strongly on the permeability coefficient and the loading velocity. In particular, drained and undrained situations are special cases of a coupling analysis. With respect to the use of the automatic load and time increment, it is shown that its use is fundamental to define the best increment size to adopt in the incremental iterative solution. About the stress integration algorithm utilised, it is shown that the error in the consistency condition decreases exponentially with the number sub steps. Finally, the ANLOG program is used to analyse the experimental excavation of Camboinhas (Silva, 1979). Comparisons between numerical and field displacements present a reasonable agreement. However, the pore pressure given by the numerical simulation varied between 10 percent to 30 percent in relation to its initial value, whereas in the field this variation was smaller than 3 percent.
TITO, JOSE CARLOS SOLIS. "NUMERICAL ANALYSIS OF DEEP EXCAVATIONS IN SOIL." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24688@1.
Full textCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Na atualidade, devido à necessidade de realizar obras de engenharia de grande porte em ambiente urbano, o engenheiro defronta-se muitas vezes com o desafio de executar escavações profundas, as quais devem ser projetadas para serem estáveis e limitar deformações a níveis aceitáveis. Uma escavação profunda estável é aquela cujas paredes não colapsam e o seu fundo não experimenta levantamento descontrolado. Deformações do solo podem afetar construções vizinhas, vias urbanas e outras instalações públicas, com consequências que dependem tanto da magnitude quanto do padrão do movimento do solo ao redor da escavação. A previsão do comportamento de uma escavação profunda envolve análises tanto de estabilidade quanto de deformação. Análises de estabilidade podem em geral ser feitas através de métodos de equilíbrio limite, mas as análises de deformações, por outro lado, são mais difíceis de serem previstas, necessitando do auxilio de métodos numéricos. Nesta dissertação, o comportamento de escavações profundas é investigado numericamente pelo método de elementos finitos, com especial atenção à ocorrência de deformações, para cuja previsão requer-se a utilização de modelos constitutivos que representem muitos dos aspectos de comportamento de solos reais.
At the present, due to the need for engineering works of large scale in urban environment, the engineer is confronted often with the challenge of performing deep excavations, which should be designed to be stable and with acceptable levels of deformations. A stable deep excavation is that, whose walls do not collapse and its base does not experience uncontrolled heave. Soil deformations can affect neighboring buildings, urban roads and other public facilities, with consequences that depend on both the magnitude and the pattern of the movement of the soil around the excavation. The prediction of the behavior of a deep excavation therefore involves stability analysis as well as deformation analysis. Stability analysis can generally be made through limit equilibrium methods, but deformation analyses are more difficult to predict, requiring the assistance of numerical methods. In this dissertation the behavior of deep excavations is numerically investigated by the finite element method, with special attention to the occurrence of deformations, for this prediction requires the use of constitutive models that represent many aspects of behavior of real soils.
Dourlet, Sébastien. "Étude expérimentale de deux excavations à Louiseville." Master's thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/38203.
Full textLieske, Rosemary. "Izapa Group B: Excavations, Burials, and Offerings." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/4305.
Full textHassell, Rhett Colin. "Corrosion of rock reinforcement in underground excavations." Thesis, Curtin University, 2008. http://hdl.handle.net/20.500.11937/1247.
Full textHassell, Rhett Colin. "Corrosion of rock reinforcement in underground excavations." Curtin University of Technology, Western Australian School of Mines, Dept. of Mining Engineering and Surveying, 2008. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=17986.
Full textIt was found that the study of corrosion is challenging due to the time required to gather meaningful data. In particular, the wide range of materials that comprise ground support systems means that it is impossible to examine all the possible combinations of variables and their potential influence on the observed levels of corrosion and measured corrosion rates. Despite these challenges, the systematic investigation has resulted in new corrosivity classifications for both groundwater and atmospheric driven corrosion processes for various reinforcement and support systems used in the Australian underground mining industry. Previous corrosivity classifications were not found applicable. Furthermore, these new corrosivity classifications are simpler than previous classifications and corrosion rates may be predicted from readily obtained measurements of ground water dissolved oxygen and atmospheric relative humidity. Different types of reinforcement and surface support systems have been rated with respect to their corrosion resistance and estimates have been made for the expected service life for various rates of corrosion.
Bovy, Kristine M. "Effects of human hunting, climate change and tectonic events on waterbirds along the Pacific Northwest coast during the late Holocene /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/6548.
Full textEl, Arja Hiba. "Contribution à la modélisation numérique des excavations profondes." Thesis, Paris Est, 2020. http://www.theses.fr/2020PESC2034.
Full textThe present research work addresses various aspects of the numerical modelling of the displacements induced by deep excavations. The first objective is to define a constitutive model allowing to obtain a good estimation of the settlement behind the retaining wall. A second objective is to contribute to the justification of retaining structures for ultimate limit states according to the format proposed by the Eurocodes.Two constitutive models based on the theory of elastoplasticity with a single mechanism are proposed: "H1 model" and "H2 model" which include respectively an isotropic hardening law and a non-linear kinematic hardening law. The formulations of the two models are presented. Their different parameters are defined from laboratory or in situ tests. The influence of each of these parameters is studied in the case of triaxial tests.Both models are implemented in the CESAR-LCPC finite element calculation code. A numerical analysis of a real excavation project taken from a benchmark prevision exercise with different constitutive models is presented. The results obtained with the H2 model do not significantly improve the results compared to the H1 model. In the following, the discussion focuses on the H1 model. Parametric studies are carried out on this excavation project to identify the parameters that have an influence on the settlement distribution calculated behind the retaining wall. Within the framework of the Grand Paris Express Project, new metro lines are being built. The excavation of the future “Créteil L'Échat” station of line 15 south is chosen as a case study in this thesis. The numerical results obtained with the H1 model are compared with measurements obtained in this station.Regarding the justification for the ultimate limit states of retaining structures, the discussion focuses on the procedure of reduction of the shear properties of soils (c-phi reduction). We seek to clarify to what extent this method can be adapted to complex constitutive models such as the H1 model
Kotheimer, Michael J. "Damage approximation in buildings adjacent to deep excavations." Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1175182826.
Full textLuk, Tat-fai, and 陸達輝. "Case studies on the stability of deep excavations." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226449.
Full textMellies, Gabriele. "TWO CASE STUDIES OF EXCAVATIONS IN FRACTURED ROCK." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26279/26279.pdf.
Full textThe stability of excavations in fractured rock is influenced among others by the structural order inherent in the rock mass. Various analysis tools are available for stability analysis, but the quality of results depends considerably on the available analysis data and the tools used. In this thesis two case studies of excavations in fractured rock are presented that investigate the influence of structural data representation on the stability analysis. The first case study focused on the stability of a rock slope along a road cut near Fleurimont that has experienced wedge failures. The aim was to find out, if the failures could have been predicted, and to evaluate the probability of wedge failures along the slope. Different limit equilibrium wedge analyses were carried out, including a deterministic back-analysis of two wedge failures and a probabilistic analysis of individual wedges. Furthermore a probabilistic joint system analysis was carried out using 3D joint system models generated out of field data. As part of this work the required analysis data was collected on site. The back-analysis results suggested potential instability of the observed wedges, and the probabilistic approaches confirmed the occurrence of wedge failures along the slope, but also indicated the only low probability for these failures. The results demonstrated that a comprehensive data analysis using various analysis tools is required to reach a reliable assessment of the rock behaviour. The second case study discusses the stability of drifts at Agnico Eagle’s LaRonde underground mine that are affected by large deformations due to rock squeezing. The analysis of the observed drift convergence focused on the generation of a series of numerical 2D finite element models, aiming to reproduce failure mechanism and resulting deformations. The in situ foliation was reproduced by explicitly introducing joints into the model. The required structural data was collected on site. As reference data for the model calibration available convergence data was used. The modelling results reached a good agreement with the observations on site. Both observed characteristic deformation profiles as well as measured deformation magnitudes could be adequately reproduced. It could be demonstrated that the applied numerical model is a useful tool to model the complex squeezing ground conditions observed at the mine. More validation experiments should be carried out, but the method can potentially be used to develop better mine development strategies in similar conditions. Both case studies demonstrated the influence of structural data representation on the data analysis. Furthermore it could be shown that the choice of analysis tools influences the obtained results.
Momigliano, Nicoletta. "MM 1A pottery from Evans' excavations at Knossos." Thesis, University College London (University of London), 1989. http://discovery.ucl.ac.uk/10048638/.
Full textLE, LU NOURRI CHANTAL. "Contribution clinique a l'etude des grandes excavations innees." Angers, 1990. http://www.theses.fr/1990ANGE1119.
Full textMellies, Gabriele, and Gabriele Mellies. "Two case studies of excavations in fractured rock." Master's thesis, Université Laval, 2009. http://hdl.handle.net/20.500.11794/21030.
Full textLa stabilité des excavations dans les roches fracturées est influencée, entre autres, par le régime structural, qui est inhérent à la roche. Divers outils sont disponibles pour les analyses de stabilité, mais la qualité des résultats dépend considérablement des données d’entrée disponibles et des outils utilisés. Dans ce mémoire, deux études de cas sont présentées, qui étudient l'influence de la représentation de données structurales sur l'analyse de stabilité. La première étude de cas traite de la stabilité d'une pente de roche le long d'une route près de Fleurimont, qui a subi des effondrements de dièdre. L’objectif était de découvrir si les effondrements pourraient avoir été prédits et d'évaluer la probabilité de la rupture de dièdre le long de la pente. Plusieurs analyses d'équilibre limite ont été effectuées, y compris une analyse déterministe rétrospective de deux ruptures de dièdres, et une analyse probabiliste des dièdres individuels. De plus, une analyse probabiliste de système de joints a été effectuée en utilisant les modèles 3D de système de joints, qui ont été générés avec des données de terrain. Les données nécessaires pour les analyses ont été recueillies sur place. Les résultats d’analyse rétrospective ont indiqué l'instabilité potentielle des dièdres observés, et les approches probabilistes ont confirmé l'occurrence des effondrements de dièdre le long de la pente, mais ils ont également démontré que la probabilité d'effondrements semblables est faible. Les résultats ont démontré qu'une analyse de données exhaustive en utilisant plusieurs outils d'analyse est requise pour obtenir une évaluation fiable du comportement de la roche. La deuxième étude de cas discute de la stabilité des galeries à la mine souterraine LaRonde de l'Agnico Eagle, qui sont concernées par de grandes déformations à cause de la convergence des parois. L'analyse de la convergence observée s'est concentrée sur la génération d'une série de modèles numériques 2D selon la méthode des éléments finis, visant à reproduire le mécanisme d'effondrement et les déformations résultantes. La foliation in situ a été reproduite par des joints, qui ont été introduits explicitement dans le modèle. Les données structurales requises ont été rassemblées sur place. Les modèles ont été calibrés avec les données de convergence disponibles. Les résultats de modélisation numérique ont atteint une bonne concordance avec les observations sur place. Les deux profils caractéristiques observés et l’ordre de grandeur des déformations mesurées ont pu être reproduits. Il a été démontré que le modèle numérique appliqué est un outil utile pour modéliser les conditions complexes observées à la mine. Plus d'expériences de validation devraient être effectuées, mais la méthode peut potentiellement être employée pour élaborer de meilleures stratégies pour les travaux de développement minier dans des conditions semblables. Les deux études de cas ont démontré l'influence de la représentation des données structurales sur l'analyse de données. En outre il a été montré que le choix des outils d'analyse influence les résultats obtenus.
The stability of excavations in fractured rock is influenced among others by the structural order inherent in the rock mass. Various analysis tools are available for stability analysis, but the quality of results depends considerably on the available analysis data and the tools used. In this thesis two case studies of excavations in fractured rock are presented that investigate the influence of structural data representation on the stability analysis. The first case study focused on the stability of a rock slope along a road cut near Fleurimont that has experienced wedge failures. The aim was to find out, if the failures could have been predicted, and to evaluate the probability of wedge failures along the slope. Different limit equilibrium wedge analyses were carried out, including a deterministic back-analysis of two wedge failures and a probabilistic analysis of individual wedges. Furthermore a probabilistic joint system analysis was carried out using 3D joint system models generated out of field data. As part of this work the required analysis data was collected on site. The back-analysis results suggested potential instability of the observed wedges, and the probabilistic approaches confirmed the occurrence of wedge failures along the slope, but also indicated the only low probability for these failures. The results demonstrated that a comprehensive data analysis using various analysis tools is required to reach a reliable assessment of the rock behaviour. The second case study discusses the stability of drifts at Agnico Eagle’s LaRonde underground mine that are affected by large deformations due to rock squeezing. The analysis of the observed drift convergence focused on the generation of a series of numerical 2D finite element models, aiming to reproduce failure mechanism and resulting deformations. The in situ foliation was reproduced by explicitly introducing joints into the model. The required structural data was collected on site. As reference data for the model calibration available convergence data was used. The modelling results reached a good agreement with the observations on site. Both observed characteristic deformation profiles as well as measured deformation magnitudes could be adequately reproduced. It could be demonstrated that the applied numerical model is a useful tool to model the complex squeezing ground conditions observed at the mine. More validation experiments should be carried out, but the method can potentially be used to develop better mine development strategies in similar conditions. Both case studies demonstrated the influence of structural data representation on the data analysis. Furthermore it could be shown that the choice of analysis tools influences the obtained results.
The stability of excavations in fractured rock is influenced among others by the structural order inherent in the rock mass. Various analysis tools are available for stability analysis, but the quality of results depends considerably on the available analysis data and the tools used. In this thesis two case studies of excavations in fractured rock are presented that investigate the influence of structural data representation on the stability analysis. The first case study focused on the stability of a rock slope along a road cut near Fleurimont that has experienced wedge failures. The aim was to find out, if the failures could have been predicted, and to evaluate the probability of wedge failures along the slope. Different limit equilibrium wedge analyses were carried out, including a deterministic back-analysis of two wedge failures and a probabilistic analysis of individual wedges. Furthermore a probabilistic joint system analysis was carried out using 3D joint system models generated out of field data. As part of this work the required analysis data was collected on site. The back-analysis results suggested potential instability of the observed wedges, and the probabilistic approaches confirmed the occurrence of wedge failures along the slope, but also indicated the only low probability for these failures. The results demonstrated that a comprehensive data analysis using various analysis tools is required to reach a reliable assessment of the rock behaviour. The second case study discusses the stability of drifts at Agnico Eagle’s LaRonde underground mine that are affected by large deformations due to rock squeezing. The analysis of the observed drift convergence focused on the generation of a series of numerical 2D finite element models, aiming to reproduce failure mechanism and resulting deformations. The in situ foliation was reproduced by explicitly introducing joints into the model. The required structural data was collected on site. As reference data for the model calibration available convergence data was used. The modelling results reached a good agreement with the observations on site. Both observed characteristic deformation profiles as well as measured deformation magnitudes could be adequately reproduced. It could be demonstrated that the applied numerical model is a useful tool to model the complex squeezing ground conditions observed at the mine. More validation experiments should be carried out, but the method can potentially be used to develop better mine development strategies in similar conditions. Both case studies demonstrated the influence of structural data representation on the data analysis. Furthermore it could be shown that the choice of analysis tools influences the obtained results.
Luk, Tat-fai. "Case studies on the stability of deep excavations /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23589486.
Full textXiao, Bo. "Numerical simulation of deep excavations in rock masses." Thesis, The University of Sydney, 1994. https://hdl.handle.net/2123/26842.
Full textHaggerty, Daniel. "A Comparison of Predicted Brace Loads in Temporary Retaining Structures and Observed Brace Loads in Two Full Scale Test Sections." ScholarWorks@UNO, 2003. http://scholarworks.uno.edu/td/51.
Full textBürgi, Christoph. "Cataclastic fault rocks in underground excavations : a geological characterisation /." [S.l.] : [s.n.], 1999. http://library.epfl.ch/theses/?nr=1975.
Full textGumusoglu, M. Cetin. "Analysis of underground excavations in strain softening rock masses." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38339.
Full textGhabraie, Kazem, and n/a. "Exploring topology and shape optimisation techniques in underground excavations." RMIT University. Civil, Environmental and Chemical Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091118.135631.
Full textGómez-Hernández, Jairo. "A model for rock mass bulking around underground excavations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ61269.pdf.
Full textGreen, Erik. "Stability and predicted ground movements of slurry trench excavations." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B30431621.
Full textPanchal, Jignasha. "Minimising ground movements around deep excavations in soft soils." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/21044/.
Full textJen, Lucy C. (Lucy Chin) 1968. "The design and performance of deep excavations in clay." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10017.
Full textHellings, Jan Eise. "The strength and stiffness of soils associated with excavations." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47471.
Full textLi, Yixiang Li. "Numerical modeling of supported excavations considering soil spatial variability." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510322541966921.
Full textZghondi, Jad. "Modélisation avancée des excavations multi-supportées en site urbain." Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0092/these.pdf.
Full textThe increasing complexity of deep excavation projects in urban areas and the limitation of the impact of these works on surrounding structures require the assessment of the behavior of these structures. This assessment should consider the calculation methods taking into account a limited knowledge (especially in pre-project phase) of the various parameters of the problem, especially the mechanical parameters of soils mobilized by the excavation process. The objective of this thesis is to assess the appropriateness of different approaches for the calculation of the multi-supported flexible retaining structures. It is based on the comparison of calculation results with those of a series of tests on small scale model and of several instrumented excavations representing a wide range of soil types, number and arrangement of supports and prestressing. The evaluation of the adequacy of computational approaches has necessitated the development of an accurate and thorough method of back analysis based on a number of indicators of errors (relative to the deformation of the wall, efforts in the supports and on the observed ground surface movements). The main objective of this method of back analysis is to determine, for each design approach, the most representative values of soil parameters that can best explain the behavior of the structure. The results show that the constitutive law used in numerical model of the excavation should present at least the level of complexity of the Hardening Soil Model (implemented in the FEM software Plaxis) in order to properly simulate the behavior of the excavation and that the process of back analysis is not relevant if one only considers only the deformation of the wall, but requires information on the loads in the supports
De, Ambrosis Andrew. "Investigation of the facing response of soil nailed excavations." Phd thesis, Department of Civil Engineering, 2004. http://hdl.handle.net/2123/4034.
Full textTitle from title screen (viewed February 12, 2009). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the [Dept. of Civil Engineering], Graduate School of Engineering. Degree awarded 2005; thesis submitted 2004. Includes bibliographical references. Also available in print form.
De, Ambrosis Andrew. "Investigation of the facing response of soil nailed excavations." Connect to full text, 2004. http://ses.library.usyd.edu.au/handle/2123/4034.
Full textTitle from title screen (viewed February 12, 2009). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the [Dept. of Civil Engineering], Graduate School of Engineering. Degree awarded 2005; thesis submitted 2004. Includes bibliographical references. Also available in print form.
Çimen, Görkem. "The excavations of the P-building and the R-bath at Labraunda: Archaeology in the 1950s based on Inge Dahlén's three excavation diaries." Thesis, Uppsala universitet, Antikens kultur och samhällsliv, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324217.
Full textFortin, Louis. "Geoarchaeological Investigations along the Tambo-Ilo Coast of Southern Peru." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/FortinL2008.pdf.
Full textMatkovic, Iva. "Roman settlement of Northern Bruttium : 200 B.C.-A.D. 300 /." *McMaster only, 2001.
Find full textMánica, Malcom Miguel Ángel. "Analysis of underground excavations in argillaceous hard soils : weak rocks." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/663452.
Full textStiff clayey materials, lying in the transition between hard soils and weak rocks, are being currently considered in several countries as possible host medium for deep geological disposal of high active and long-lived nuclear waste. This possibility has led to the construction of underground research laboratories (URL), excavated in these indurated clayey materials, to study their behaviour under real working conditions. Among the very different topics addressed in the URLs, the hydromechanical behaviour of the host rock is the one that most concerns the present research. In situ observations have revealed that excavation operations induce damage around the galleries, in the form of fracture networks, contained within a zone called excavation damaged zone (EDZ). The EDZ has been identified as one of the main aspects affecting the behaviour of the excavations. In this context, the main objective of the present study is the numerical simulation of the hydromechanical behaviour of experimental excavations performed at the Meuse/Haute-Marne URL (France). For this purpose, a constitutive model has been developed to characterise the host formation. The modelling of these stiff argillaceous materials is a quite challenging task. They exhibit soil-like features like considerable plastic strains, rate-dependency, and creep, although they also show characteristics more typical of a rock such as significant softening and localised deformations. In addition, due to their sedimentary origin, they often exhibit anisotropy in properties like stiffness, strength, and permeability. Special attention has been paid to the reproduction of the EDZ and, therefore, to the objective simulation of localised deformations; a nonlocal approach has been employed for the regularisation of the continuum, avoiding the dependence on the employed mesh. The obtained results provide relevant insights into the hydromechanical behaviour of these stiff clayey materials, and they indicate the main aspects affecting the response of the underground excavations. In particular, the relevance of the EDZ has been demonstrated.
Korff, Mandy. "Response of piled buildings to the construction of deep excavations." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244715.
Full textWright, Kristine Elizabeth. "Mortuary patterning, a burial analysis from Northwest Coast archaeological excavations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0013/MQ61518.pdf.
Full textGoh, K. H. "Response of ground and buildings to deep excavations and tunnelling." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599464.
Full textMcNamara, Andrew Martin. "Influence of heave reducing piles on ground movements around excavations." Thesis, City University London, 2001. http://openaccess.city.ac.uk/8280/.
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