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根据围岩和混凝土破坏原理，提出了围岩和混凝土损伤开裂的三维非线性有限元计算方法．给出了混凝土衬砌开裂后裂缝宽度的估算公式，并对实际工程进行了分析计算．探讨了高压岔管受力和破坏的一些基本特性．
According to the principle of the failure of surrounding rock and concrete, a three-dimensional nonlinear finite element method for calculating the damage of surrounding rock and concrete is proposed. The formula of crack width after cracking of concrete lining is given, and the actual engineering is analyzed and calculated. Some basic characteristics of stress and failure in high pressure manifolds are discussed.