温州地区厚层软土UU三轴试验与FLAC3D数值模拟  

UU Triaxial Test and FLAC3D Numerical Simulation of Thick Soft Soil in Wenzhou Area

作　　者：赵鑫[1] 张文帅 Zhao Xin;Zhang Wenshuai(School of Civil Engineering,Hebei University of Engineering,Handan 056038,Hebei,China)

机构地区：[1]河北工程大学土木工程学院

出　　处：《岩土工程技术》2019年第6期367-371,共5页Geotechnical Engineering Technique

基　　金：河北社科基金(HB17YJ040);河北工程大学博士基金项目(17129033060)

摘　　要：三轴试验获得的抗剪强度参数是重大项目地勘报告中不可缺少的参数,根据土工试验方法标准对温州地区饱和厚层软土进行UU三轴试验,获得了土的主应力差-轴向应变关系曲线和抗剪强度包络线,求得了土的抗剪强度参数。在试验时存在试样制备困难、剪切效率低以及对试验条件要求较高等一系列问题。因此,基于室内UU三轴试验结果,利用FLAC3D数值分析软件,进行厚层软土UU三轴试验数值模拟试验。结果显示:数值模拟试验与室内试验相比主应力差-轴向应变关系曲线和抗剪强度包络线的变化趋势基本一致,虽然出现黏聚力略大,内摩擦角略小的现象,但均在试验误差范围内。数值模拟试验能够较好地模拟厚层软土的UU三轴试验,获得抗剪强度参数,为土体通过数值模拟试验获得抗剪强度参数提供参考。The shear strength parameters obtained by the triaxial test are indispensable parameters for the geological survey of major projects.According to the geotechnical test method standard,the UU triaxial test was carried out on the saturated thick soft soil in Wenzhou,and the principal stress diffenrence-axial strain relationship curves,the shear strength envelope curves,as well as the shear strength parameters of the soil were obtained.There are a series of problems during the test,such as difficulty in preparation of the sample,low shearing efficiency and high requirements on the test conditions.Therefore,based on the results of UU triaxial test,FLAC3 D numerical analysis software was used to carry out the numerical simulation test for UU triaxial test of thick soft soil.The results show that the variation tendency of the principal stress difference-axial strain curve and the shear strength envelope curve is basically consistent between the numerical simulation test and the laboratory test.Although the phenomenons of slightly higher cohesive force and slightly lower internal friction angle appears,they are all within the range of test error.The numerical simulation test can simulate the UU triaxial test of thick soft soil well,and obtain shear strength parameters,providing references for similar soils to obtain shear strength parameters through numerical simulation test.

关 键 词：厚层软土 UU三轴试验 FLAC3D 数值模拟 

分 类 号：TU43[建筑科学—岩土工程]