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

作　　者：李鹏[1,2] 刘建[2] 李国和[1] 朱杰兵[3] 刘尚各[2] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300251 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]长江科学院水利部岩土力学与工程实验室,武汉430010

出　　处：《岩土力学》2011年第2期380-386,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.40672192;No.40772193);国家自然科学基金重点项目(No.50539090);国家重点基础研究发展计划(No.2009CB724603)

摘　　要：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.

关 键 词：砂岩 水化学作用 抗剪强度 黏聚力 内摩擦角 化学动力学 

分 类 号：TU452[建筑科学—岩土工程]