多排微型桩边坡加固的效果分析

微型桩因放坡空间小、侧向刚度大等特点被广泛应用在边坡治理中。本文运用ABAQUS软件模拟多排微型桩,分析土层条件以及桩排数对微型桩加固效果的影响。研究结果表明:微型桩在滑坡推力的作用下其主要破坏模式是抗弯破坏,最大剪力发生在滑面附近,滑面处第1、第2、第3排桩最大剪力比值约为1∶(0. 64～0. 88)∶(0. 48～0. 75);边坡滑体岩土强度越高,微型桩群与桩间土体整体移动趋势越强,各排桩之间位移差距越小;在软弱地层条件下仅设置竖向排桩加固效果不明显,未能较好地发挥其抗滑作用。

Effect Analysis of Slope Reinforcement with Multi-row Micropiles

Micropiles are widely used in slope treatment because of their small slope space and large lateral stiffness.In this paper,ABA Q US software was used to simulate multi-row micropiles,and the inf luence of soil conditions and the number of pile rows on the reinforcement effect of micropiles was analyzed.The results show that the main failure mode of micropiles is bending failure under the action of landslide thrust,the maximum shear force occurs near the sliding surface,the maximum shear ratio at the sliding surface of the f irst ,second and third row of piles is about 1 ∶(0.64~0.88)∶(0.48~0.75).The higher the rock and soil strength of slope sliding body,the stronger the soil overall movement trend between micropile group and piles and the smaller the displacement gap between rows of piles is under the condition of weak stratum.The reinforcement effect of setting vertical row piles only is not obvious,and the anti-sliding effect of vertical row piles is not well developed.