基于修正剑桥模型三轴剪切实验数值模拟  

Numerical Simulation Analysis of Triaxial Test Based on Modified Cam Clay Model

作　　者：夏琼[1] 蒋代军[1] 李建东 XIA Qiong;JIANG Daijun;LI Jiandong(National Experimental Demonstration Center for Civil Engineering Education,Lanzhou Jiaotong University,Lanzhou 730070,China;Civil Engineering School,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程国家级实验教学示范中心,兰州730070 [2]兰州交通大学土木工程学院,兰州730070

出　　处：《实验室研究与探索》2024年第9期97-102,共6页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(42362033)。

摘　　要：为了进一步拓展三轴剪切实验课教学内容,丰富实验教学方法,基于修正剑桥模型,构建三轴固结不排水实验数值模型,采用应力场与渗流场耦合模拟分析CU实验过程;分析CU实验应力路径、塑性体积应变、孔隙水压力的变化规律,推导出破坏时孔压系数公式,以及罗斯柯线归一化方程式。数值模拟实验允许实验参数或土性参数的改变,可以设计更全面的实验工况,得到更丰富的实验数据,再进行实验结果分析,得出的结论更准确。实验教学过程中引入数值模拟实验,可让学生不仅学会实验原理相关理论知识,还能将理论知识应用于实验过程,激发学生的学习兴趣,引导学生从被动学习实验理论知识向主动设计实验方向转变。In order to further expand the teaching content of the triaxial shear test and enrich test teaching methods,based on modified Cam clay model,a numerical model for triaxial consolidated undrained test is constructed,and the CU test process is simulated and analyzed by coupling stress field and seepage field.The rules of stress path,plastic volumetric strain and pore water pressure are analyzed.Both the formula for pore pressure coefficient at failure and Roscoe line normalization equation are reduced.During numerical simulation experiment,changes in experiments or soil parameters are allowed,so more comprehensive test conditions can be designed,more abundant test data can be obtained,and more accurate conclusions can be drawn after analyzing experimental results.If numerical simulation experiment is introduced in experiment teaching process,it can help students not only learn theoretical knowledge related to experimental principles,but also apply theoretical knowledge to the experimental process,and arouse students’interest.Numerical simulation experiment can guide students to shift from learning experimental theory knowledge passively to designing experiments actively.

关 键 词：修正剑桥模型 三轴试验 数值模拟试验 实验教学 

分 类 号：TU43[建筑科学—岩土工程]