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针对目前主应力轴固定单调剪切情况下砂土是否存在非共轴性这一争议,以山东汶河粉细砂为研究对象,采用空心圆柱仪对砂土进行一系列不同大主应力方向角的定轴剪切排水实验,对饱和砂土的强度、应力应变以及非共轴变形特性进行研究。结果表明:大主应力方向角对于砂土的强度特性具有明显的影响,随着大主应力方向角的增大,强度呈现先减小后增大的规律,同时变形表现出明显的各向异性;更为重要的是,在不同大主应力方向角下进行主应力轴固定单调剪切时,主应力方向与主应变增量方向存在明显的非共轴角,这种非共轴现象不可忽略。
In view of the controversy whether there exists non-coaxiality of sand under the condition of monotonous shearing of the principal stress axis, a case study was conducted on a fine column of sand and fine sand in Wenhe, Shandong Province. Axis shear drainage experiment was conducted to study the strength, stress-strain and non-coaxial deformation characteristics of saturated sand. The results show that the main stress direction angle has a significant effect on the strength of sand, and the strength decreases first and then increases with the increase of the principal stress direction angle. At the same time, the deformation shows obvious anisotropy ; More importantly, when the principal stress axis is fixed and monotonically sheared under different principal stress directions, there is a significant non-coaxial angle between the principal stress direction and the principal strain increment direction. This non-coaxial phenomenon can not be ignored .