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为了解水溶造腔过程中盐腔围岩在应力-溶解耦合作用下的溶解损伤机制,利用高温三轴盐岩溶解特性试验机,开展了复杂卸荷条件下(即卸围压的同时增加轴压)不同卤水流量对盐岩的溶解损伤特征研究。研究发现,盐岩的应力和溶解作用相互影响,共同决定盐岩试件在卸荷溶解过程中的变化特征。表现为:卸荷过程中偏应力越大,盐岩溶出速率越大,而且出水口卤水浓度随卸荷溶解时间呈现显著的二次函数关系;盐岩在溶解作用下其力学强度降低,变形能力不断增强,而且流量越大,变化趋势越明显。通过对盐岩卸荷溶解过程中有效溶解面积构成的分析,建立了盐岩卸荷溶解作用下的有效溶解面积模型,分别得到了各有效溶解面积随溶解时间和应力水平的变化方程,并在此基础上构建了盐岩卸荷溶解损伤演化方程,为进一步开展盐岩的损伤-溶解机制研究提供了理论和试验基础。
In order to understand the mechanism of dissolution and damage of surrounding rock of salt chamber under the action of stress-dissolution coupling during the process of water-soluble cavity-forming, the high-temperature triaxial rock salt dissolution test machine was used to carry out the experiments under complicated unloading conditions Dissolution Damage Characteristics of Salt Rock by Different Brine Flows. It is found that the stress and dissolution of salt rock interact with each other to determine the changing characteristics of salt rock specimen during unloading and dissolution. The results show that the greater the deviatoric stress is, the higher the dissolution rate of salt rock is, and the concentration of brine in outlet is significantly quadratic function with the time of unloading dissolution. The mechanical strength of salt rock decreases under the action of dissolution, and the deformation capacity Continue to increase, and the greater the traffic, the more obvious the trend of change. Based on the analysis of the effective dissolution area during unloading and dissolution of salt rock, the effective dissolution area model of salt rock under unloading and dissolution was established, and the equations of variation of each effective dissolution area with dissolution time and stress level were obtained respectively. Based on this, the evolution equation of unloading dissolution damage of rock salt was constructed, which provided the theoretical and experimental basis for further research on the damage-dissolution mechanism of salt rock.