Behaviour of large post-liquefaction deformation in saturated sand-gravel composites  

作　　者：潘华 陈国兴 孙田 刘汉龙 

机构地区：[1]Institute of Geotechnical Engineering,Nanjing University of Technology [2]Geotechnical Research Institute,Hohai University

出　　处：《Journal of Central South University》2012年第2期547-552,共6页中南大学学报（英文版）

基　　金：Project(90715018)supported by the National Natural Science Foundation of China;Project(200808022)supported by the Special Fund for the Commonweal Indusry of China;Project(08KJA560001)supported by the Key Basic Research Program of Natural Science of University in Jiangsu Province;Project(CX10B_170Z)supported by the Postgraduate Scientific Innovation Program in Jiangsu Province,China

摘　　要：The laboratory tests on the post-liquefaction deformation of saturated sand-gravel composites were performed to investigate the characteristics of stress-strain relation and the dissipation of pore water pressure by the hollow cylinder apparatus. It is found that the stress-strain response and the dissipation process of pore water pressure are composed of three stages, including the low intensive strength stage, the superlinear strength recovery stage and the sublinear strength recovery stage, and the demarcation points of the curve of pore water pressure are lag behind those of the stress-strain response. The comparison results of the behaviour of large post-liquefaction deformation between saturated sand-gravel composites and Nanjing fine sand show that the low intensive strength stage and the superlinear strength recovery stage of saturated sand-gravel composites are shorter while the sublinear strength recovery stage is longer. A stress-strain model and a dissipation model of excess pore water pressure of liquefied sand-gravel composites are established, in which the initial confining pressure and the relative density can be considered synthetically. And it is found that the predicted results by the two models are in good agreement with experimental data.The laboratory tests on the post-liquefaction deformation of saturated sand-gravel composites were performed to investigate the characteristics of stress-strain relation and the dissipation of pore water pressure by the hollow cylinder apparatus. It is found that the stress-strain response and the dissipation process of pore water pressure are composed of three stages, including the low intensive strength stage, the superlinear strength recovery stage and the sublinear strength recovery stage, and the demarcation points of the curve of pore water pressure are lag behind those of the stress-strain response. The comparison results of the behaviour of large post-liquefaction deformation between saturated sand-gravel composites and Nanjing fine sand show that the low intensive strength stage and the superlinear strength recovery stage of saturated sand-gravel composites are shorter while the sublinear strength recovery stage is longer. A stress-strain model and a dissipation model of excess pore water pressure of liquefied sand-gravel composites are established, in which the initial confining pressure and the relative density can be considered synthetically. And it is found that the predicted results by the two models are in good agreement with experimental data.

关 键 词：saturated sand-gravel composites post-liquefaction deformation stress-strain relation dissipation model： pore water pressure 

分 类 号：TU52[建筑科学—建筑技术科学]