基于管土作用模型的极限滑坡位移预测

Prediction of Limit Landslide Displacement Based on Pipe-soil Interaction Model

滑坡作为典型地质灾害之一,严重威胁埋地管道的安全运行。若能准确预测管道所能承受的极限滑坡位移,则可结合先进的滑坡监测技术对管道失效事故进行有效预判。有鉴于此,首先建立并验证了基于非线性接触的管土作用模型,之后对模型参数及边界条件设置进行了讨论,最后基于形成的模拟方法研究了应力/应变准则下极限滑坡位移预测方法。结果表明:两侧设置无限边界的非线性接触管土作用模型更适用于真实滑坡工况下管道力学响应分析,可实现土体与管道大变形及管土分离的有效模拟,并可用于基于应力及应变准则的极限滑坡位移预测。本文为山区管道的安全设计及滑坡事故的防控提供了有效的技术手段。

As one of the typical geological hazard,landslide seriously threatens the safe operation of buried pipelines.If the limit landslide displacement that the pipeline can bear can be accurately predicted,the pipeline failure accident can be effectively predicted combined with advanced landslide monitoring technology.In view of this,firstly,a pipe-soil interaction model with nonlinear contact was established and verified.Then,the effects of model parameters and boundary conditions on simulation results were discussed.Finally,the prediction method of the limit landslide displacement for stress/strain criterion is researched.The conclusions are as follows.The nonlinear contact pipe-soil interaction model with infinite boundaries on both sides is more suitable for the mechanical response analysis of pipeline under real landslide conditions.Using this model,the large deformation and separation of pipeline and soil can be effective simulated by that model,the limit landslide displacement based on stress and strain criteria can also be predicted.This paper provides an effective technical means for the safety design of pipelines in mountainous areas and the prevention and control of landslide accidents.