基于滑坡区域的不同土质埋地输气管道安全评价

Safety Evaluation of Buried Gas Pipeline Under Different Soil Properties in Landslide Area

滑坡是威胁埋地管道安全的地质灾害类型之一。随着管道建设的不断发展,管道不可避免的会穿越滑坡频发区域,为了保障管道安全,避免不必要的经济损失,有必要对滑坡作用下的管道进行安全评价。不同土质的滑坡土体对管道造成的影响不尽相同。结合工程实例,选择FLAC 3D有限差分软件,将不同滑坡土质下管道临近屈服强度时模拟得到的滑坡体位移及管道位移进行比较,研究不同滑坡体土质对管道可靠性的影响。结果表明:整个滑坡体的位移量大致沿滑动方向逐渐减小,最大值位于滑床后缘,其中,由于管道的存在,靠近管道上方的滑坡体合位移量相对较小;埋地管道的最大变形出现在管道穿越滑体的中间部位;滑坡土质为黏土情况下的埋地管道最为危险。

Landslide is one of the geological hazards that threaten the safety of buried pipelines.With the continuous development of pipeline constructions,pipelines inevitably pass through landslideprone areas.In order to ensure pipeline safety and avoid unnecessary economic losses,it is necessary to conduct a safety evaluation on pipelines under landslides.Different soil properties of landslide will have different influences on the pipeline.Combined with an engineering example,FLAC 3D finite difference software is used to compare the simulated landslide displacement and pipeline displacement when the pipeline is near yield strength under different landslide soil properties,so as to study the influence of different landslide soil properties on the pipeline reliability.The results show that the displacement of the whole landslide decreases gradually along the sliding direction,and the maximum value is located at the back edge of the sliding bed,and the resultant displacement of the landslide above the pipe is relatively small.The maximum deformation of the buried pipeline appears in the middle part of the pipeline crossing the sliding body.Buried pipes are most dangerous when the landslide soil is clay.