基于离散元的不同截面抗滑桩土拱效应分析

Analysis of soil-arching effect of anti-sliding piles with different cross-sections based on DEM

选取典型抗滑桩截面(方形、矩形和圆形),采用离散元(DEM)手段,从细观角度对这三种横截面桩土拱效应的形成发育过程及相关影响因素进行分析研究。结果表明:三种抗滑桩桩后均有土拱效应产生,方形桩跟矩形桩所形成的土拱效应均大致呈半圆弧状,圆形桩的土拱效应则近似马鞍形;矩形桩所能承载的极限荷载最大,方形桩次之,圆形桩最弱;不同的影响因素对同类型的抗滑桩影响规律及程度均存在差异,同一影响因素对不同截面抗滑桩影响规律相同但影响程度不同。

We choose three typical cross - sections of anti - sliding piles （ square, rectangle, circular） to study their soil - arching forming and developing mechanisms and the related influential factors from microscopic perspective based on DEM. The results show that soil - arching effect forms behind the three types of anti - sliding piles, the soil arch of square pile and rectangle pile is semi -circle shape, and the circular pile＇s soil arch is saddle -shaped. The ultimate bearing capacity of rectangle pile is the largest, square pile is the second, and the circular pile is the smallest. Different influential factors have different influences and degrees on the anti - slide piles, while the same factor affects anti - slide piles of different sections in the same law but with different degrees.