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.
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