P波作用下埋地管道的相互作用动力分析

Dynamic analysis of interactive underground pipes impacted by P-waves

建立了波动理论计算公式,给出了地下管道在平面P波作用下动力响应问题的解析近似解答。对地下多管道体系的动力相互作用进行了分析。结果表明:当埋地管道之间的距离较近时,管道之间的波往复反射作用增强,相互作用明显,动应力集中具有显著的放大效应;随着管道中心距离的增加,动应力集中峰值振荡逐渐平稳;当中心距达到约100倍的管道内径时,相互作用消失,结果退化为单个管道的结果。

Dynamic responses of underground pipes were analyzed by wave theory formula. The analytical solution was obtained to study the interaction between pipes impacted by incident P-waves. It is shown from the computed results that the peak values of dynamic stress concentration are magnified greatly at close distances by to-and-fro wave reflections and calm down with farther distances of pipes. When the center distances are greater than nearly 100 times the inner radius of the pipe, the interaction between pipes is disappeared and the results degenerate to single pipe.