震前主应力轴的旋转。
主应力轴正向旋转较逆向旋转产生的孔压小；
The pore water pressure under positive rotation of principal stress axes is smaller than that under inverse rotation.
以此为基础，结合空心圆柱仪的加载特点，给出了室内模拟主应力轴旋转的加载方法。
On the base of loading properties of hollow cylinder apparatus, loading method to simulating the principal stress axes rotation in laboratory tests is given.
考虑主应力轴偏转角循环加载的饱和软黏土显式模型可更为有效地预测路基长期沉降。
The explicit model is validated based on undrained cyclic test data. It will be more effective to calculate the long-term settlement of subgrade under traffic loading with the proposed explicit model.
给出荷载移动线正下方和荷载移动线外土单元应力的时程曲线、应力路径、主应力轴方向变化曲线。
The time-history curve of stress, stress path and curves of the principal stress axes rotation of soil element under and beside the load moving line are presented.
为了研究三个主应力不同情况下的土体强度和变形特性，需要进行复杂的真三轴试验研究，本文主要研究内容如下。
In order to study the pressure features and deformation features of soil under three different major stresses, complicated truly triaxial test are needed.
研究表明，多轴应力状态下NEPE固体推进剂强度与应力相关，八面体剪应力随平均主应力的增加呈非线性增加；NEPE推进剂的破坏强度随拉伸速率的增加而提高。
The results show that strength of NEPE solid propellant under multi-axis stress state is related to strain; octahedral shear stress nonlinearly increases with the average main stress.
为探讨岩石的强度理论和中间主应力效应，进行了红砂岩真三轴压力试验。
The true triaxial pressure experiment for red sand rock is conducted for the purpose of investigation into the strength theory of rock and the effect of intermediate main stress.
弄清受荷单元的主应力主应变关系是认识各向异性变形性状的有效方法，而真三轴试验是必要的手段。
A valid method to make the anisotropic deformation behavior of load bearing unit clear is to research principal stress and principal strain relationship, and true triaxial test is a necessary means.
在此基础上，分析了双轴拉-压极限强度随冻融循环次数的变化规律，并在主应力空间和八面体应力空间建立了同时考虑冻融循环次数和拉压比的破坏准则。
On this basis, the failure criterion of concrete simultaneously considering the freeze-thaw cycle and tension-compression ratio in principle stress space and octahedral space is established.
在此基础上，分析了双轴拉-压极限强度随冻融循环次数的变化规律，并在主应力空间和八面体应力空间建立了同时考虑冻融循环次数和拉压比的破坏准则。
On this basis, the failure criterion of concrete simultaneously considering the freeze-thaw cycle and tension-compression ratio in principle stress space and octahedral space is established.
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