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利用空心圆柱扭剪仪对原状软黏土开展了系列含主应力方向旋转条件下的试验研究:包括单纯旋转主应力方向、单纯往复旋转主应力方向以及主应力方向旋转的同时增加剪应力等典型应力路径。主要研究应力方向效应对软黏土变形及孔压特性的影响。通过参数对比研究,分析了中主应力系数b、剪应力水平、应力旋转方向及与剪应力耦合作用的影响等。试验结果表明:在主应力大小保持不变的条件下,主应力方向的旋转也会引起软黏土显著的应变和孔压或体应变的累积,中主应力系数对应变和孔压的变化规律均有一定的影响,b=0.5时,试样接近平面应变;b=0.75时,孔压随应力旋转累积最显著。剪应力越大,主应力方向旋转引起的应变和孔压也越显著。应力方向效应和剪切对土体具有叠加耦合作用。
A series of experimental tests were carried out on intact soft clay under the direction of principal stress rotation using a hollow cylindrical torsional shear tester. The experimental results include simple principal direction of rotation, simple direction of principal stress of reciprocating rotation, and typical stress such as shearing stress path. The main research stress direction effect on the deformation of soft clay and pore pressure characteristics. Through the comparative study of parameters, the effects of the middle principal stress coefficient b, the level of shear stress, the direction of stress rotation and the coupling with shear stress are analyzed. The experimental results show that under the condition that the principal stress remains the same, the rotation of the principal stress will also cause the significant strain of soft clay and the accumulation of pore pressure or volume strain. The variation of the principal stress coefficient on the strain and the pore pressure Which has a certain influence. When b = 0.5, the sample is close to the plane strain; when b = 0.75, the pore pressure accumulates most significantly with the stress rotation. The greater the shear stress, the more significant the strain and pore pressure caused by the rotation of the principal stress direction. Stress direction effect and shearing have superposition coupling effect on soil.