水化学作用对砂岩抗剪强度特性影响效应研究

Experimental study for shear strength characteristics of sandstone under water-rock interaction effects

开展了不同水化学溶液侵蚀条件下砂岩的抗剪强度试验,分析了水化学作用对砂岩微细观结构的影响效应,探讨了砂岩的水化学损伤机制。在此基础上,分析了水化学作用对砂岩抗剪强度的影响规律。通过引入岩石水化学损伤度,定量表达了砂岩抗剪强度参数随水化学损伤的演化过程,并采用化学动力学方法,模拟在给定水化学环境条件下重庆砂岩损伤度随时间演化过程,进而预测其抗剪强度参数演化规律。所得结果为定量化研究水化学作用对岩石物理力学特性的影响效应及预测与水化学作用相关的岩土工程的安全性和稳定性提供了良好的借鉴作用。

Shear strength tests of sandstone under different hydrochemical environments were carried out.The effect of hydrochemical action on sandstone structure was analyzed from the viewpoint of meso-mechanism;and the mechanism of hydrochemical damage of sandstone was discussed.On this basis,the effect of hydrochemical action on shear strength of sandstone was analyzed;and a variable was introduced to quantitatively express the hydrochemical damage evolution of shear strength parameters.Moreover,the evolution of hydrochemical damage degree of Chongqing sandstone under certain environment was simulated by chemical kinetics method.Based on the simulation,the shear strength parameters can be predicted.The study results can be used as a valuable reference to quantitatively evaluate the hydrochemical corrosion of rock;so as to offer an effective method to estimate the safety and stability of rock engineering under water-rock interaction effects.