水-岩化学作用下岩体裂纹应力强度因子的计算及分析

水化作用对裂隙岩体的影响主要来自于水压力和化学腐蚀伤两方面的作用.运用地球化学矿物-水反应的溶解动力学,考查水-岩反应化学溶液中不同时间段离子浓度的变化,从理论上探讨化学腐蚀下等效裂纹扩展的定量化分析方法,从而建立水-岩化学作用下等效裂纹扩展的计算公式并计算裂纹尖端应力强度因子.计算表明,水-岩化学作用的存在,对应力强度因子的影响明显,随着水-岩化学作用的不断发展,应力强度因子逐渐增大.

Calculation of Stress Intensity Factor for Crack Under Chemical Corrosive of Water-Rock Interaction

The effects of water pressure and chemical damage on the stress intensity factor of crack in rocks are analyzed.Geochemical kinetics of mineral-water interactions is used to check ion concentration in chemical solution under different periods,and quantitative methods for equivalent crack propagation under chemical corrosive of water-rock interaction are approached.According to conservation of mass,the evolution equation of crack is obtained and chemical corrosive of water-rock interaction is equivalent to effective crack length.The computational formulation of equivalent crack propagation is set up and the stress intensity factor is also calculated.The results show that the influence of water-rock chemical interaction on crack propagation is notable and the stress intensity factor increases with water-rock interaction.