标准砂小应变特性的应力路径三轴试验研究

通过应力路径三轴试验，将标准砂样分别K0固结和等向固结到平均球应力150 kPa，在p-q平面内沿0o，45o，90o，135o，180o，225o，270o，315o应力路径方向进行16组试样的应力应变关系试验研究，对当前应力路径、前期应力路径、应力路径旋转条件下1 %范围内剪应变和体积应变规律进行了对比分析。由试验曲线整理得到的剪切模量和体积模量随应力路径变化规律与已有的Bothkennar黏土试验结果类似。

Small-strain behaviour of standard sand by stress path controlled triaxial tests

By stress path controlled triaxial tests,the stress-strain curves of 16 standard sand specimens,which were tested along directions 0o,45o,90o,135o,180o,225o,270o,315o in p-q plane after isotropic and K0 consolidation to a same mean effective stress 150kPa,are presented.The shear and volumetric strains less than 1 % are compared by considering effects of recent stress path,historic stress path and stress path rotation.The change laws of shear and volumetric moduli of standard sand tests with the direction of stress path are found to be similar with the reported test results of Bothkennar clay.