采用了修正的析因设计方案，对低渗透致密砂岩进行了有效应力方程的实验研究。
Laboratory study on the effective stress of low-permeability sandstone rock was carried out using the modified factorial design program.
本文在定义对数损伤变量和相应的有效应力之后，引入了一种考虑材料内部空穴演变的裂尖损伤演变方程。
After defining a logarithm damage variable and effective stress, we introduce a damage evolution equation at crack tip bytaking into account the physical mechanism of the development ofcavities.
将基于多孔介质的有效应力原理引入流固耦合渗流中，并根据平衡条件得出了应力场方程；
Principle of effective stress in porous media is introduced into fluid-structure coupling theory, then according to the equilibrium condition, the stress equation is established.
运用损伤力学以及断裂力学理论，定义了岩体损伤张量、有效应力张量、损伤应变等，建立了损伤演化方程，从而建立了多裂隙岩体的损伤断裂模型。
Using the theory of damage mechanics and fracture mechanics, the damage tensor, effective stress tensor and damage strain, etc. of rock mass are defined, propagation equation of damage is developed.
基于对多孔介质双重有效应力的研究，重申了多孔介质中任一点处，上述三种应力之间的正确关系，并把相应的数学表达称为多孔介质的应力关系方程。
This study restated proper relations among these three stresses at any locations in porous medium, and called the corresponding mathematical expressions the stress-based equations of porous medium.
基于对多孔介质双重有效应力的研究，重申了多孔介质中任一点处，上述三种应力之间的正确关系，并把相应的数学表达称为多孔介质的应力关系方程。
This study restated proper relations among these three stresses at any locations in porous medium, and called the corresponding mathematical expressions the stress-based equations of porous medium.
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