复合式格栅加筋陡坡数值分析

Numerical analysis of composite reinforced soil steep slope

重庆某滨江防洪护岸综合整治工程,为减少环境影响和尽快恢复生态环境,适应三峡蓄水后的施工条件,提出了低桩承台+两级格栅加筋陡坡的结构方案。针对该工程的新型结构方案,运用有限元方法,对低桩承台内力和变形、两级格栅加筋陡坡的格栅拉力和坡面变形等进行了分析,并结合强度折减法分析了复合陡坡的整体稳定性。结果表明,由于土工格栅的拖拽作用,低桩承台的内力和变形比未加筋陡坡分别减少了1/4和1/2,坡顶的沉降减少了1/3,坡面的侧向变形减少了1/2,陡坡格栅加筋的综合效用明显。数值计算分析为工程建设方案的确定提供了较完整的计算基础,可供类似工程参考。

In one embankment construction in Chongqing Binjiang road,a new structure combining low pile cap with two step geogrid reinforced steep slope above has been proposed,in order to reduce the environmental impact,restore the environment and adapt to the new construction condition.The internal force and displacement of low pile cap,the deformation of the slope,and the tension（together with the distribution） of the geogrid are analyzed by the finite element method.Additionally,the slope stability is analyzed by the strength degradation FEM.The results show that the internal force and displacement of the low pile cap reduce 1/4 and 1/2 respectively,the slope settlement reduces 1/3,and the lateral displacement reduces 1/2.Obviously,the reinforcing effect is remarkable.The analysis provides valuable references for similar engineering.