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利用空心圆柱扭剪仪对不同含应力旋转路径条件下黏土的非共轴变形特性开展了研究。试验应力路径包括:主应力方向单纯旋转、主应力方向往复循环旋转以及旋转的同时增加剪应力,分析了主应力系数、剪应力水平、应力旋转方向及其与剪应力耦合作用对黏土非共轴特性的影响。试验结果表明:各类含应力旋转路径都会引起原状黏土相应的变形累积,中主应力系数及剪应力值对应变的开展都有一定的影响。不同主应力方向旋转路径引起的主应变增量方向都与主应力方向存在显著的非共轴现象。排水条件、中主应力系数、循环次数对黏土非共轴特性的影响较小,剪应力值较小时非共轴现象更为显著,主应力旋转方向反向时,非共轴角会随之发生突变,应力旋转路径是决定黏土非共轴变形规律的主要因素。
The research on the non-coaxial deformation of clay under different stress-induced rotational path conditions is carried out by using the hollow cylindrical torsional shear instrument. The experimental stress path includes: the direction of principal stress is simply rotated, the direction of principal stress is reciprocatingly rotated and rotated, and the shearing stress is increased. The principal stress coefficient, the level of shear stress, the direction of stress rotation and its coupling with shear stress are analyzed. Effect of characteristics. The experimental results show that all kinds of stress rotation paths will cause the corresponding deformation and deformation of the intact clay, and the middle principal stress coefficient and the shear stress value all have certain influence on the strain development. The principal strain increments induced by different principal stress directions have significant non-coaxial with the principal stress direction. Drainage conditions, middle main stress coefficient and number of cycles have little effect on the non-coaxial characteristics of clay. When the shear stress is small, the non-coaxial phenomenon is more significant. When the main stress rotation direction is reversed, the non-coaxial angle will follow Mutation and stress rotation path are the main factors that determine the non-coaxial deformation of clay.