北京地区黏质粉土三轴试验与分析  

Analysis and triaxial tests of Beijing clay silt

作　　者：侯世伟[1] 路德春[1] 杜修力[1] 许成顺[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《土木工程学报》2010年第S1期548-553,共6页China Civil Engineering Journal

基　　金：国家重点基础研究发展计划项目(2007CB714203);国家自然科学基金(50809001;90715035)

摘　　要：利用北京地铁十号线某段的重塑黏质粉土试样,采用英国GDS的多功能静三轴仪分别进行了固结排水和固结不排水的三轴压缩试验,得到了该种土的应力-应变曲线,并给出了土的抗剪强度指标与模型参数。基于通用有限元软件ABAQUS使用Mohr-Coulomb模型、Druker-Prager模型和修正剑桥模型模拟了土样三轴试验的破坏过程,分析了剪胀特性对土样破坏形式的影响,结果表明修正剑桥模型不能反映土的剪胀特性,而Mohr-Coulomb模型、Druker-Prager模型则过大地考虑了土的剪胀特性;考虑剪胀性的模型计算固结排水情况易出现剪切带,而不能考虑剪胀性的模型计算固结不排水情况易出现剪切带。Clay silt in some section of Beijing subway No.10 is used as reconstituted way,multifunctional triaxial equipment of GDS is used to do CD and CU triaxial test,and then basic intensity index,stress-strain relation and model parameters were got.The Mohr-Coulomb model,Druker-Prager model and Modifed Cam-Clay model of ABAQUS are used to do numerical simulation,including failure process of sample and effect of dilation to sample failure.The results show that Modifed Cam-Clay Model can't be used to simulate dilation,Mohr-Coulomb model and Druker-Prager model consider dilation excessively.The failure mode of model with dilation form shear band firstly in drained condition,while the failure mode of model without dilation form shear band firstly in undrained condition.

关 键 词：黏质粉土 三轴压缩 数值模拟 修正剑桥模型 

分 类 号：TU442[建筑科学—岩土工程] TU411[建筑科学—土工工程]