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Numerical investigation into the failure of a micropile retaining wall
Institution:1. Research Group on Complex Processes in Geo-Systems, The University of Queensland, Brisbane, QLD 4072, Australia;2. Geotechnical Engineering Centre, School of Civil Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;3. Department of Civil Engineering, Federal University of Viçosa, Campus Universitrio, Viçosa, MG 36570-000, Brazil;4. School of Mining Engineering, UNSW Australia, Sydney, Australia;5. Lecturer School of Mathematics and Physics, The University of Queensland, Brisbane, QLD 4072, Australia;1. School of Civil & Environmental Engineering, Tarbiat Modares University of Iran, Iran;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong;1. Univ. Grenoble Alpes, 3SR, CNRS UMR 5521, Domaine Universitaire, BP 53, 38041 Grenoble Cedex 09, France;2. EGIS Geotechnique, 3 rue du Dr Schweitzer, 38180 Seyssins, France;3. LGCIE INSA Lyon, 34 Avenue des Arts, 69621 Villeurbanne Cedex, France;1. College of Civil Engineering, Hebei Institute of Architecture and Civil Engineering, Hebei, Zhangjiakou, China;2. China Railway Design Corporation, Tianjin, China;1. University of Lyon, LTDS, UMR CNRS 5513, École centrale de Lyon, Écully, France;2. Laboratory of Shape Analysis, Ecole Nationale Supérieure d’Architecture de Lyon, Vaulx en Velin Cedex, France;3. Coventry University, Faculty of Engineering, Environment and Computing, School of Energy, Construction and Environment, Centre for Low Impact Buildings, Priory Street, CV1 5FB, United Kingdom
Abstract:The paper presents a numerical investigation on the failure of a micropile wall that collapsed while excavating the adjacent ground. The main objectives are: to estimate the strength parameters of the ground; to perform a sensitivity analysis on the back slope height and to obtain the shape and position of the failure surface. Because of uncertainty of the original strength parameters, a simplified backanalysis using a range of cohesion/friction pairs has been used to estimate the most realistic strength parameters. The analysis shows that failure occurred because overestimation of strength and underestimation of loads.
Keywords:Numerical analysis  FEM  Ground failure  Micropiles  Retaining walls  Back analysis
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