不同应力状态下盐岩的损伤恢复

为了研究不同应力状态下盐岩的损伤恢复，实验对单向、双向和三轴3种应力状态下损伤盐岩试件进行了恢复对比实验。旨在探寻力学作用下岩盐损伤恢复的宏观现象。实验结果表明：由于应变硬化的存在，利用弹性模量评价盐岩这类软岩的损伤恢复是具有局限性的；盐岩极限强度、盐岩到达极限强度所需能量与能量比值能良好反应应力作用状态下盐岩损伤恢复的变化情况；适当增加围压对损伤盐岩试件的恢复有促进作用,三相应力相同的条件下的初始轴压对损伤恢复却具有一定的抑制作用。因而，在盐腔稳定性维护过程中，最佳的数据系统应在考虑盐腔可控应力与地应力间的关系下建立。

Damage recovery of salt rock under different stress states

Experiments on the damaged recovery of salt rock samples under uniaxial,biaxial and triaxial stress states have been conducted to study what influences the stress states exert on the damage recovery of the samples.The aim of the experiments is to find out the macro-phenomena of the recovery of damaged salt rocks under the effects of mechanics.The results of the experiments are as follow:firstly,because of the strain hardening,there is a limitation in the application of elastic modulus to evaluate salt rock;secondly,the ultimate strength of salt rock,the energy required for salt rock to reach ultimate strength and the energy ratio can reflect the recovery of damaged salt rock samples under different stress states;thirdly,the confining pressure can promote recovery,while the axial pressure under identical triaxial compression will cause a greater damage.The study proposes that the relationship between the controllable stress and crustal stress of salt cavity should be taken into account for establishing an optimized data system during the maintenance of salt cavity stability.