特殊土体边坡安全性及加固措施分析

Analysis on the Safety and Reinforcement Measures of Special Soil Slope

为了保证边坡下部隧道施工时边坡的稳定性,依托重庆某浅埋暗挖隧道项目,运用数值模拟的方法建立二维及三维有限元模型,通过计算施工前边坡的安全系数分析其潜在滑移模式,判断边坡的稳定性,同时分析采用高压旋喷桩在边坡上形成注浆加固墙体这一措施对边坡的加固效果。研究结果表明:边坡稳定性是具有一定安全储备的。同时,由于填土黏聚力小,类似于砂土,边坡潜在滑移首先表现为浅层滑动。增设注浆加固墙体后,会改变边坡潜在滑移模式。

In order to ensure the stability of the slope during the construction of the tunnel at the lower part of the slope,this paper establishes two-dimensional and three-dimensional finite element models based on a shallow tunnel project in Chongqing.By calculating the safety factor of the side slope before the construction,the potential slip mode is analyzed,the stability of the side slope is judged,and at the same time,the reinforcement effect of high-pressure jet grouting pile on the slope is analyzed.The results show that the slope stability has certain safety reserve.Meanwhile,due to the small cohesion of the fill,similar to the sand,the potential slip of the slope is first shown as shallow slip.After adding grouting to strengthen the wall,the potential sliding mode of the slope will be changed.