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文章以刚体极限平衡的随机块体理论及地应力、围岩二次应力的强度理论建立概率极限状态方程，用可靠度理论进行无压水工隧洞围岩稳定分析，所得计算成果符合实际。使无压水工隧洞的完建期和检修期的围岩稳定问题得到较为满意的解决。
Based on the random block theory of rigid body limit equilibrium and the stress theory of the secondary stress of surrounding rock, the article establishes the state equation of probability limit, and uses the reliability theory to analyze the surrounding rock stability of the hydraulic tunnel without pressure. The calculated results are in line with the actual situation. So that the completion of non-pressure hydraulic tunnel construction and maintenance of the stability of rock around the more satisfactory solution.