考虑K_0固结的软土基坑工程三维非线性有限元分析  

Three-dimensional nonlinear finite element analysis of soft soil excavation engineering considering K_0 consolidation

作　　者：陈林靖[1] 戴自航[1] 刘志伟[2] 

机构地区：[1]福州大学岩土工程研究所,福州350108 [2]福建省电力有限公司,福州350003

出　　处：《岩土力学》2011年第12期3796-3804,共9页Rock and Soil Mechanics

基　　金：福建省自然科学基金重点资助项目(No.D0720001);福州大学科研启动基金资助项目(No.022279)

摘　　要：为考虑基坑工程的空间效应,土体分别采用K0固结和正常固结试样固结不排水(CU)试验得到的Duncan-Chang非线性弹性模型和Mohr-Coulomb理想弹塑性模型,运用ABAQUS软件按照三维实体单元、壳单元、梁单元考虑接触相互作用的耦合有限元法,建立了福州市一典型软土基坑工程整体三维有限元分析模型,对基坑施工的各工况下整个体系的响应进行了数值模拟"目标试验",并与实测结果和二维数值模拟结果进行了比较,结果表明,采用K0固结试样CU试验参数的Duncan-Chang模型对该基坑进行的三维非线性数值模拟分析方法是较为可靠的,较之Mohr-Coulomb理想弹塑性模型和二维有限元分析,其结果的优势是明显的,是值得推崇和具有较好应用价值的方法。In order to consider spatial effect of excavation engineering,Duncan-Chang nonlinear elastic model and Mohr-Coulomb ideal elastoplastic model attained by K0 consolidation and normal consolidation samples with CU tests are adopted;and the whole 3D finite element analysis of soft soil excavation engineering in Fuzhou city using 3D solid elements,shell elements and beam elements considering contact interactions is built which applies ABAQUS software.The response of the whole system during the construction of the foundation pit is done by numerical simulation ＂object tests＂;and it is compared with the field measurements and 2D numerical simulation results.It is shown that compared with Mohr-Coulomb ideal elastoplastic model and 2D results,the results from 3D numerical simulation analysis using Duncan-Chang constitutive model parameters attained by K0 consolidation samples with CU tests are more reliable.It has distinct advantages and possesses of tremendous popularization and application value.

关 键 词：基坑 空间效应 K0固结 三维非线性有限元分析 DUNCAN-CHANG模型 

分 类 号：TU447[建筑科学—岩土工程]