孔隙水压力对岩石力学参数的影响

The Effect of the Pore Water Pressure on the Rock Mechanics Parameters

多孔多相的岩石介质中,孔隙水压力的变化会引起岩石的变形,其力学参数随之改变,而岩石的力学参数变化反过来会引起渗流场发生改变。本文利用岩石力学参数在其中的作用,推导出孔隙水压力变化时,岩石变形与孔隙度、压缩系数和体积弹性模量间的关系式。通过理论计算与分析表明,在渗流场和变形场的非线性程度不很高,参数关系不是很复杂的情况下,利用岩石力学参数的更新来进行耦合分析的方法,对于近期工程应用行之有效。

In multi-phase porous rock media, the change of pore water pressure will induce the deformation of rocks and the variation of rock mechanics parameters, which, in tum, will change the seepage flow field. Using the rock mechanics param- eters, this paper deduces the relationships of deformation, porosity, coefficients of compressibility and bulk elastic modulus during the variation of the pore water pressure. Theoretical calculation and analysis show that it is effective to use couple anal- ysis by means of renovated rock mechanics parameters when the seepage flow field and deformation field are given.