岩盐溶腔围岩应力分布规律的有限元分析

在有限元数值计算的基础上，分析了岸盐溶腔围岩地应力等值线图以及主应力随深度和水平方向的变化规律，探讨了溶腔顶板跨度、溶腔水压力以及岩盐层埋深等因素对岩盐溶腔围岩地应力分布的影响。研究认为，主应力一般将随深度的增大而增大；离岩盐溶腔的越近，岩盐溶腔对其周围地应力分布的影响程度也随之增大。随着顶板跨度的增加，在岩盐溶腔边界的地应力集中愈明显，且波及的范围愈大；随着溶腔内水压力的逐渐增大，岩盐溶腔围岩内的地应力集中逐渐削弱；随着岩盐层埋深的增大，岩盐溶腔围岩内地应力集中现象愈加明显，且其围岩内的地应力绝对值也将明显增大。

FEM Analysis of Stress Distribution Law in the Rocksalt Cavity's Surrounding Rock

Basic on the FEM numerical analysis, the contour maps stress of rocksalt cavity's surrounding rock and the major principal stress's law changed with the depth and horizontal direction are analyzed. The influencing factors to the distribution of the stress surrounding rocksalt cavity, such as cavity's span, water pressure and the depth of rocksalt layer is also studied. The results show that major principal stress becomes big with the increase of rocksalt's depth. The cavity's influence to the stress's distribution will be clearer with the nearer to the cavity. The stress's centralization will be weaker with the accretion of water pressure in rocksalt's cavity. But the stress's centralization will be stronger, and the stress's value increases.