裂隙岩体有效应力及其工程意义

Effective stress principle of fractured rocks and its engineering application

本文简要介绍了有效应力概念。在线弹性条件和等效应变的假定下,推导出饱水均质各向异性材料有效应力的一般表达式,给出了横观各向同性和正交各向异性两类材料有效应力的计算公式,指出在这两类材料中孔隙水压力具有偏应力效应,有效应力和孔隙压力呈非线性关系。探讨了裂隙岩体有效应力对岩体强度的制约机制,简要论述了各向异性岩体有效应力原理的工程意义。

The development of a concept of the effective stress was concisely introduced. Under the linearly elastic assumptions and equivalent strains superposition principle, a general equation of the anisotropic effective stress was derived for saturated material and especially for transversely-isotropic and orthoanisotropic rocks. The author indicated the deviatory effects of pore pressure existed in both rocks. The relation between pore pressure and effective stress of fractured rocks was nonlinear. Finally, the failure mechanism of saturated fractured rocks was discussed and its application in engineering practice was prospected.