地下埋藏式压力钢管非线性有限元分析

将罚函数应用于地下埋藏式压力钢管的非线性有限元强度分析 ,考虑了回填混凝土和围岩的弹塑性、初始地应力以及开挖支护引起的二次应力的影响 ,将更充分地发挥压力钢管的实际承载能力 ;考虑内水压力作用下钢衬的弯曲和剪切效应 ,对大直径管的应力将更接近于实际应力状态

Nonlinear finite element analysis of steel penstock embedded in rock

Steel penstocks embedded in rock are being widely used in middle and large scale hydroelectric projects, whose scales are getting larger and larger. The value of HD exceeds the value set by the Code,and the method suggested by the Code can not embody the real load bearing capability of the materials under the internal water pressure. So it can not meet the need of construction of modern hydroelectric projects. In this paper, the authors take into account for the elastic and plastic behavior of filled concrete and surrounding rock, consider the effects of initial geostress and secondary geostress caused by excavation and supports, and the bending and shear effects of steel lining subject to internal water pressure, apply the penalty function in the strength analysis and develop a nonlinear finite element method program. With the program, the authors analyze a project example and get some useful conclusions for the project design.