摘要
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。
Aiming at the current dispute on the existence of non-coaxiality of sands under principal stress axis fixed conditions,a series of drained tests for principal stress axes fixed at various orientations were conducted on Wenhe fine sands with an automated hollow cylinder apparatus. Based on the experimental results,the strength and deformation behavior,especially the non-coaxiality of sands were studied. The results show that the orientation of principal stress has remarkable influence on the shear strength and deformation of anisotropic sands. With the increase of orientation angle of major principal stress,the shear strength of fine sands tends to reduce at first,and then increases gradually. The principal strain increment direction is inconsistent with the principal stress direction in fixed principal stress axes shear tests,and the noncoaxial phenomenon cannot be ignored.
出处
《济南大学学报（自然科学版）》
北大核心
2017年第6期478-484,共7页
Journal of University of Jinan(Science and Technology)
基金
国家自然科学基金项目(51409120)
山东省高等学校优秀中青年骨干教师国际合作培养计划项目
关键词
主应力轴固定
饱和粉细砂
大主应力方向角
非共轴
fixed principal stress axes
fine sands
orientation angle of major principal stress
non-coaxial
