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通过开展围压卸载试验,研究不同三轴应力状态下围压卸载对岩盐试件扩容特征的影响,以及扩容与卸载形式之间的关系。研究发现,(1)围压卸载时岩盐的体积扩容量与偏应力存在较为明显的对数关系;(2)卸载的初始围压对岩盐的扩容影响几乎不存在;轴压增大能够促进岩盐的扩容,使加速扩容点前移,且加速扩容点对应的偏应力与轴压的增加呈线性关系;(3)岩盐的膨胀系数(即横向应变与纵向变形的比值)随着偏应力的增大,呈现先线性增加后指数增加的趋势。
By carrying out the test of confining pressure unloading, the influence of confining pressure unloading on the expansion characteristics of rock salt specimens under different triaxial stress conditions and the relationship between capacity expansion and unloading are studied. The results show that (1) there is a significant logarithmic relationship between volumetric expansion capacity of rock salt and deviatoric stress during unloading of confining pressure; (2) the effect of unloading initial confining pressure on the expansion of rock salt is almost non-existent; increasing axial pressure can promote rock salt (3) The expansion coefficient of rock salt (ie, the ratio of lateral strain and longitudinal deformation) increases with the increase of axial stress Large, showing a linear increase in the first index increased trend.