有压引水隧洞温度应力的三维有限元分析

结合有压引水隧洞工程实例,提出基于Workbench仿真平台建立围岩和衬砌的整体有限元模型,模拟对应工况下的材料性质、地质和环境条件.并分析该模型在有、无温度应力的条件下,衬砌的应力和应变分布情况及相应的极值.研究结果表明:衬砌底部内侧出现拉应力最大值,拉应力较为集中分布在底部与顶部,衬砌两侧出现压应力最大值.计算结果显示,温度降低产生的拉应力对衬砌结构稳定性的影响较大,在设计衬砌和配筋时需充分考虑.

3D Finite Element Analysis of the Temperature Stress of the Diversion Pressure Tunnel

The temperature stress of the hydraulic tunnel is hard to calculate under the complex geological conditions,by using 3D finite element method this paper calculated the temperature stress of the diversion pressure tunnel lining produced by temperature change.Combining with the project example of the diversion pressure tunnel,based on the ANSYS workbench simulation platform this paper developed a whole finite element model of surrounding rock and lining to simulate the corresponding material properties,geological and environmental conditions.Analyzing the distribution and the corresponding extremum of stress and strain of the lining of the model with and without temperature-stress.The results prove that:the inside lining of the bottom produces the maximum value of tensile stress,tensile stress is concentrated distribution in the bottom and top,on both sides of the lining produce the maximum value of stress.Those calculations demonstrate that tensile stress caused by temperature decreasing greatly influences the stability of lining structure,so we should fully considered this issue in the design of lining and reinforcement.