Nonlinear large deformation approach is adopted in analyzingstability of saltrock cavity and the deformation of the surrounding rock is modeled to explore the effect of inner water pressure and excavating steps on the stability of saltrock cavity.%采用非线性大变形方法分析了岩盐水溶开采溶腔的稳定性，模拟了溶腔围岩的变形状态，研究了内水压力以及开挖步骤对溶腔稳定性的影响，并提出了溶腔顶板极限跨度的计算方法．
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