中缅油气管道贵州段沿线滑坡变形特征及成因

Characteristics and causes of landslide deformation along Guizhou Section of Myanmar–China Oil and Gas Pipelines

中缅油气管道贵州段沿线地势起伏大、地貌形态复杂多样,复杂地质条件下发育了多种地质灾害,其中滑坡灾害对油气管道的安全危害极大。基于中缅油气管道贵州段沿线自然地理、地质环境、区域构造地貌以及降雨特征,对管道途经区域的滑坡变形及其成因进行了剖析,并对沿线低地层倾角典型坡体的演化过程进行了物理模拟。研究结果表明:中缅油气管道贵州段沿线发育的滑坡类别主要为土质滑坡与顺层岩质滑坡,地貌倾角变化较大,人类工程活动、强降雨作用等是触发滑坡事故的主要诱因;低地层倾角的坡体变形演化模式以蠕滑-拉裂与蠕滑-拉裂-崩塌模式为主。加强管道沿线的滑坡监测与预警,可为中缅油气管道贵州段的安全平稳运行提供重要的地质信息。(图12,表3,参29)

The area along Guizhou Section of Myanmar-China Oil and Gas Pipelines is very undulating in terrain with complex and diverse surface morphology, where many kinds of geological disasters are developed under the complicated geological conditions. In particular, the landslide disasters have great safety hazard to the oil and gas pipelines. Herein, the landslide deformation in the areas where the pipelines pass by and corresponding causes were analyzed based on the characteristics of Guizhou Section of Myanmar-China Oil and Gas Pipeline,including the physical geography, geological environment, regional tectonic landform and rainfall. Meanwhile, physical simulation was performed for the evolution process of typical slopes with small dip angle along the pipelines. According to the research results, the landslides developed along Guizhou Section of Myanmar-China Oil and Gas Pipelines are mainly classified into soil landslide and bedded rock landslide, where the dip angle varies greatly;human engineering activities and heavy rainfalls are the main factors inducing landslide.The slope deformation with small dip angle is mainly evolved in the patterns of creeping-cracking and creep-cracking-collapse. Therefore,strengthening the landslide monitoring and early warning along the pipelines could provide important geological information for the stable operation of Guizhou Section of Myanmar-China Oil and Gas Pipelines.(12 Figures, 3 Tables, 29 References)