跨断层地下管道破坏的数值模拟

Numerical simulation of underground pipes damage crossing fault

应用非线性有限元分析软件ADINA对跨断层地下管道破坏进行数值模拟．考虑管土相互作用,管道 模型划分为四结点薄壳单元(shell)结构,土体和断层模型划分为三维实体单元(3-D Solid),断层作为有厚 度的特殊材料考虑,管道采用钢管,建立了管土相互作用的有限元分析模型．计算中,分析了地下管道分别 在静载和动载作用下,考虑摩擦和不考虑摩擦下的变形情况,根据模拟结果绘出了管道变形图、应力云图 及应力矢量图等．通过比较不同情况下管道的反应特征,发现跨断层地下管道破坏分析中管土摩擦不容忽 视,并得出几点结论．

The underground pipes damage crossing fault is numerical simulated as the basis of Automatic Dynamic Incremental Nonlinear Analysis (ADINA) . The analysis model is presented under interaction of pipe and soil. The pipe is described into 4 - nodes thin shell element and the soil and fault are modeled as 3 - D Solid. Fault is described into a special material with thickness, while pipe is steel material. Geometric model is established and the distortion of underground pipes is calculated under static load and dynamic load, the friction between pipe and soil is also considered. According to the calculating results, distribution of displacement, effective stress and stress vector on pipe are mapping, and the response of underground pipes is analyzed. It is found that the influence of friction is unassailable. Finally, some advice for engineering construction is proposed.