对油气管道斜坡段管土作用改进模型的探讨研究

Discussion on the improved model of pipe-soil interaction in the abrupt slope and landslide section of oil and gas pipeline

目前分析管-土作用采用的模型是通过土弹簧的方式将载荷传递到管道上,土弹簧参数选取的基础是实验室研究,试验场地为平整场地,因此实验室成果对于管土界面模拟和滑波工况拟合可能都不是有效的,而且斜(滑)坡中管道承受的荷载、土弹簧系数应当是随着空间和时间而变化,现行通用法则都忽略了这些因素。本文对地表倾斜时的土弹簧抗力公式进行了推导,建立了斜(滑)坡段改进土弹簧模型,得出了不同地面倾斜角度下各向土弹簧抗力变化规律,对于斜(滑)坡段管-土相互作用计算具有一定的指导意义。

The model used for the interaction between the pipe and the soil is to use a soil spring to transfer the load to the pipe.The basis of the selection of soil spring parameters is based on laboratory test,and the test site is a flat site.Therefore,laboratory results may not be effective for pipe-soil interface simulation and slip-wave conditions.Moreover,the load and soil spring coefficient of the pipeline in the abrupt slope and landslide should vary with space and time,these factors are ignored by current general rules.In this paper,we deduced the soil spring resistance formula when the ground is tilted,and the improved soil spring model of the abrupt slope and landslide section is established,and the variation law of the resistance of the various soil springs under different ground angles is obtained.The improved soil spring model of the abrupt slope and landslide section we have established has certain guiding significance for the calculation of the interaction between the soil and the abrupt slope and landslide section.