非达西渗流与变渗透系数下的大变形固结分析  

Analysis of large-strain consolidation with non-Darcy flow and variable permeability coefficient

作　　者：李刚[1,2] 张金利[1,2] 杨庆[1,2] 蒋明镜[3] 

机构地区：[1]大连理工大学土木工程学院,辽宁大连116024 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [3]同济大学地下建筑与工程系,上海200092

出　　处：《中南大学学报（自然科学版）》2016年第3期977-983,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41572252)~~

摘　　要：基于大变形固结理论,考虑非Darcy渗流与渗透系数变化的耦合作用,建立平面固结问题的控制方程与有限元方程。采用所编制的计算程序,对某一黏性土体固结过程进行数值计算。通过变动参数,探讨非Darcy渗流与渗透系数变化的影响。研究结果表明:固结初期,渗透系数变化可引起浅部土层超孔压消散滞后,固结中后期,整个土层均存在超孔压滞后现象,且随参数αc的增大而更加明显。参数m对固结过程的影响与参数αc相似,而参数iL的影响则相对较小。当考虑参数αc与m共同影响时,固结度降低与超孔压滞后更加显著。The finite element equations and governing equations of plane consolidation were deduced with non-Darcy flow and variable permeability coefficient based on large-strain consolidation theory. The consolidation process of clay foundation was analyzed by the program developed by the finite element equations. The influence of non-Darcy flow and variable permeability coefficient on consolidation was studied by parameters changing. The results indicate that variable permeability coefficient delays the dissipation of excess pore water pressure in shallow soil layers in the early stage of consolidation, and then the phenomenon exists in the whole soil layers in the middle and later stage. The effect on consolidation is more obvious with the increase of αc. The influence of m on consolidation process is the same as αc, whereas iL is smaller than them. The decrease of degree of consolidation and the lag of excess pore water pressure are more obvious when the influence of αc and m in the meantime is considered.

关 键 词：大变形 非DARCY渗流 变渗透系数 固结度 超孔压 

分 类 号：TU43[建筑科学—岩土工程]