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利用自主改造的、大主应力与小主应力方向由刚性加压板加载、中主应力方向由围压室液压加载的自动控制刚柔复合真三轴仪,对上海原状软土进行同一π面上不同洛德角真三轴固结排水剪切试验。原状土样通过分块抽样法获取,共进行了5组不同洛德角(0°、15°、30°、45°和60°)排水剪切试验。试验结果显示,上海原状软土抗剪强度、屈服和破坏点位置随洛德角的增大而减小,体积变化量先增大后减小。三向应力状态下上海软土的破坏强度接近空间滑移面(SMP)破坏准则。
Using self-reformation, the main stress and the direction of the small main stress by the rigid pressure plate load, the direction of the main stress by the confining pressure chamber hydraulically loaded rigid-flexible complex triaxial apparatus, the original undisturbed soft soil in Shanghai for the same pi Different true rhode solid three-axis consolidation drainage test. The undisturbed soil samples were obtained by the block sampling method. A total of five sets of drainage shear tests with different degrees of Rhodes (0 °, 15 °, 30 °, 45 ° and 60 °) were carried out. The experimental results show that the shear strength, yield point and failure point of Shanghai undisturbed soft clay decrease with the increase of Rhodes angle, while the volume change increases first and then decreases. The failure strength of Shanghai soft soil in the three-dimensional stress state is close to the failure criterion of the space slip surface (SMP).