摘要
岩土材料在主应力轴旋转作用下会产生无法忽视的塑性体变以及不可逆剪应变,为探讨主应力轴旋转作用产生变形的根源,对主应力轴旋转过程进行分解,主应力轴在物理空间中转动步骤可分解为绕任意三个XYZ轴的自旋转相叠加的过程,分析单元体在物理空间中围绕单轴旋转过程,建立物理空间中主应力轴旋转角与莫尔圆中剪正应力比反正切值的关系。利用所提的考虑主应力轴旋转的增量模型,对于纯主应力轴旋转在循环加载以及正反旋转加载作用下的变形以及三轴压缩进行模拟,模拟结果表明,所提模型可有效的用于模拟主应力轴旋转作用下岩土材料的变形预测。
The unignorable volume plastic strain and irreversible shear strain would be produced due to the rotation of the principle stress axes. The process of rotation of principle stress axes is decomposed in order to explore the causes of the rotation of the principle stress axes. The step for rotation of principle stress axes is divided into a process that the superposition of self rotation to XYZ axes in physical space. The relationship between rotation angle of principle stress axes and arctangent value of ratio between shear stress and normal stress in Mohr's circle is established. The rotation process around single axes for cubical unit is analyzed in physical space. The pure rotation of principle stress axes in cyclic loading condition and round-trip loading condition and conventional triaxial compression condition are modeled by using the proposed incremental model. The simulation result has been shown that it is effective to use the proposed model to predict the deformation of geomaterials under rotation of principle stress axes condition.
作者
万征
康富中
赵晓光
郭金雪
WAN Zheng;KANG Fuzhong;ZHAO Xiaoguang;GUO Jinxue(China Academy of Building Research,Research Institute of Base and Foundation,Beijing 100013,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第A02期4308-4319,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金项目(11402260)~~
关键词
土力学
主应力轴旋转
塑性体变
莫尔圆
循环加载
三轴压缩
soil mechanics
rotation of the principle stress axes
volume plastic strain
Mohr's circle
cyclicloading
triaxial compression
