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本文依据力学原理分析了地下工程洞体形成前后岩体内应力、应变特征，总结出松弛断裂型和底鼓突破型两类突水的力学条件。并提出了集中力在岩体内形成应力的静态液压分布原理。
Based on mechanics principle, this paper analyzes the stress and strain characteristics of rock masses before and after the formation of underground engineering cavities, and summarizes the mechanical conditions of two types of water inrush faults and bottom drum breakthrough. The principle of static hydraulic distribution of stress concentration in rock mass is put forward.