渗透动水压力作用下裂隙岩体渗流与应力耦合分析

Analysis of coupled seepage and stress firelds in rock mass by considering hydrodynamic seepage pressure

针对裂隙岩体的渗透水压力使岩体应力产生非常大变化,同时应力变化也影响裂隙岩体渗透性。考虑岩体渗流和应力耦合分析是研究地下水活动规律的首要问题。当岩体以裂隙为主,且其分布较密集时,可将岩体系统看作等效连续多相介质体系。运用等效连续介质理论,建立了等效连续岩体渗流与应力耦合分析的数学模型,充分考虑了渗透水压力和裂隙的存在对岩体应力及孔隙裂隙水压力变化产生的影响。给出了渗流场与应力场耦合分析的工程算例。

Permeable pressure in fractured rock mass indeed changes stress in rock,at the same time the change has influence on permeability of fractured rock mass.Coupling analysis of seepage and stress is the main problem to researching groundwater floating laws.When the fracrues is the main character and distribution is intensive,the rock is considered as equivalent continuous polyphase medium.With equivalent continuous medium theory,a model of seepage and stress coupling effect in equivalent continuous rock is built and the influence that existence of permeable pressure and fracture has on rock stress and water pressure in pore and fracture is sufficiently considered.In the end,acalculation example of a project for coupling analysis of seepage and stress is given.