碎石排水通道对挡墙稳定性的影响研究

Study on the Influence of Gravel Drainage Channel on the Stability of Retaining Wall

为提升挡墙后侧排水效果,保证挡墙稳定性、安全性,文中提出在挡墙内部布设横、竖向碎石排水通道的方案,并通过数值模型模拟分析了布设排水通道对挡墙稳定性的影响。结果表明,在挡土墙内侧设置横向、横向+竖向排水通道,均能在一定程度上增强挡墙稳定性,尤其是横向+竖向排水通道下挡墙稳定性更高;横、竖向通道间距越小,排水能力越强,挡墙稳定性越高;土体指标a越大,挡墙稳定性越高,当a>50时,稳定性基本保持不变;指标n越大,稳定性越低,且当n>5时,稳定性基本不再发生变化;碎石渗透系数越大,挡墙稳定性越高。

In order to improve the drainage effect of the rear side of the retaining wall and ensure the stability and safety of the retaining wall,a scheme of laying horizontal and vertical gravel drainage channels inside the retaining wall was proposed in this paper,and the influence of laying drainage channels on the stability of the retaining wall was analyzed by numerical model simulation.The results show that both lateral and lateral+vertical drainage channels can enhance the stability of retaining wall to a certain extent,especially the stability of retaining wall under lateral+vertical drainage channels.And the smaller the distance between horizontal and vertical channels,the stronger the drainage capacity and the higher the stability of retaining wall;The larger the soil index a is,the higher the stability of the retaining wall is.When a>50,the stability basically remains unchanged.The larger the index n is,the lower the stability is,and when n>5,the stability basically no longer changes.The higher the permeability coefficient of crushed stone,the higher the stability of retaining wall.