三轴仪K_(0)系数测量与应力路径试验功能的研发  

Development of K_(0)Coefficient Measurement and Stress Path Test Function of Triaxial Apparatus

作　　者：潘上 刘谨豪 张琪 叶冠林[1] PAN Shang;LIU Jinhao;ZHANG Qi;YE Guanlin(Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《上海交通大学学报》2021年第4期372-379,共8页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(41727802,41630633)资助项目。

摘　　要：上海交通大学自行研制组装的高精度小应变新型三轴仪(以下均简称为新三轴仪)采用了内置轴压三轴室,集成了程序自动控制的应力、应变式加载功能以及线性差动变压器(Linear Variable Differential Transformer,LVDT)测量小应变功能.本文在此基础上进一步进行拓展,使其具备了测量土样K_(0)系数和沿q-p(q为偏应力,p为平均主应力)应力空间任意方向进行应力路径剪切试验的功能.首先简要介绍三轴仪的研发历史,然后对K_(0)系数测量和应力路径试验两大新功能的控制程序算法进行详细说明,接着对上海深部软土进行K_(0)系数测量与应力路径试验并对结果进行简要分析,对新功能的可靠性进行了验证.所研发新三轴仪的经验可为土工仪器设备的研发提供参考.The high accuracy small strain triaxial apparatus(hereinafter inferred to as the new triaxial apparatus)developed and assembled by Shanghai Jiao Tong University adopts a built-in pressure chamber by integrating the stress and strain loading function automatically controlled by the program and the linear variable differential transformer(LVDT)function of measuring small strain.In this paper,the new triaxial apparatus is further expanded.Now it has the function of measuring K_(0)coefficient of undisturbed soil sample and performing stress path loading along any direction of q-p(q is the deviatoric stress and p is the average principal stress)stress space.First,the development history of the new triaxial apparatus is briefly introduced and the control program algorithm of K_(0)coefficient measurement and stress path test for the two new functions are described in detail.Then,the K_(0)coefficient measurement and stress path test for deep soft clay in Shanghai are conducted,and the results are analyzed to verify the reliability of the new functions.The experience of the new triaxial apparatus can provide reference for the development of geotechnical instruments.

关 键 词：三轴仪 静止土压力系数(K_(0)) 应力路径试验 上海深部土 

分 类 号：TU43[建筑科学—岩土工程]