渗透与水化学作用之受力岩体的破坏机理

Analysis on Mechanism of Permeation and Hydrochemical Action Resulting in Failure of loaded Rock Mass

运用水文地球化学理论、突变理论和伪张力法分析了受力岩体系统在地下水流体渗透和水化学综合作用下的破坏机理，给出了渗透作用下受压岩石宏观破裂判据．结果表明，渗透作用加剧了受力岩体裂隙相互作用，导致微裂隙扩展及其相互作用发生变化，从而改变裂隙较易聚集的方向；水化学作用使岩体强度降低，其生成的粘土矿物使裂隙扩展张力加大；这两方面的综合作用使得岩体破坏、条件更易满足．

The mechanism of permeation and hydrochemical action resulting in failure of loaded rock mass has heen analysed by hydrogeochemical and catastrophic theory, as well as the method of pseudotraction. The criteria that can predict the orientation of the fracture of the macro failure under permeation were derived. lt is found that the permeation may aggravate the interaction and coalescence between cracks in rocks under the compression and may change the orientation on the fracture. The rock strength can be lowdered by the hydrochemical action and the tensile stress of the propagation of cracks will be increased owing to clay minerals. The condition of the fracture in rocks will be satisfied more easily as a result of the synthetic of permeation and hydrochemical action. In view of the above mentioned, some problems of slope instability are discussed.