油气管道铺设对边坡稳定性的影响

摘要

Firstly,the laying mode of the pipeline in the slope body is analyzed,which is divided into two types horizon-tal laying and longitudinal laying.Then,the geotechnical engineering finite element software PLAXIS is used to analyze the safety factor of the slope in different positions of the slope.The results show the following results :Under the condition of horizontal laying,the safety factor of the slope first decreases and then increases when the pipe laying position moves from slope foot to slope body.The safety factor is slightly equal to the safety factor of the natural slope ;Under the condi-tions of longitudinal laying,the slope safety factor is the largest when the angle between pipeline and slope is 0 degree ;when the angle is 15 degree,30 degree,45 degree,the safety factor of slope is smaller than that of natural slope,and its value does not change much ;The pipe laying has little effect on the formation and location of the shear zone when the slope is unstable.The shear strain on the surrounding soil is obviously changed only when the pipe is located in the shear zone.%首先分析了管道在边坡体中的铺设方式,基本分为两类:横向铺设和纵向铺设;然后采用岩土工程有限元软件PLAXIS分析了管道在坡体中不同位置时坡体安全系数的变化规律.结果表明:横向铺设条件下,管道铺设位置由坡脚向坡体内改变时,其边坡的安全系数先减小后增大,增大后的安全系数略等于自然坡体的安全系数;管道在坡体内向坡顶改变时,其安全系数先减小后增大,但在坡顶位置时安全系数又减小;纵向铺设条件下,管道与坡面夹角为0°时边坡安全系数最大;夹角为15° 、30° 、45°时,边坡安全系数均比自然坡体小,同时其值变化不大;管道的铺设对坡体失稳时剪切带的形成和位置影响较小,只有当管道位于剪切带区域内时,管道对周围土体的剪应变有明显的改变.