不同水位下降速度对浸水土钉墙整体稳定性影响的分析

Analysis of Immersion Stability of Soil Nailing Wall Under Different Water Levels Fall Speed

针对郑州2021年7月份突降特大暴雨,基坑几乎全部被雨水浸泡,抽排水速度对基坑的整体稳定性影响较大,速度过快会导致基坑失稳.本文通过一个实际基坑项目,计算基坑在不同水位下降速度下浸润线的位置,利用瑞典条分法计算基坑整体稳定性.研究表明:基坑内水位下降的过程中,坡体内部水渗出速度滞后于坡外水位下降的速度,会产生指向坡外的渗流力,影响基坑的稳定性.水位速度下降越快,浸润线越陡,基坑稳定性越差.

On July 20-21,2021,Zhengzhou plunged the torrential rain since recorded history.In full water of excavation,the suction drainage speed strongly affecte the overall stability of the excavation.Too fast suction drainage speed will lead to instability of excavation.Through a practical excavation project,this paper calculates the excavation under different water levels fall velocity soakage line position by using the Swedish article points method to calculate the global stability of excavation.Research shows that:in the process of excavation pit water levels falling,slope internal water seepage velocity lags in front of the slope in water level drop speed,pointing outside the slope seepage force which affects the stability of excavation;the faster the water level declines,the steeper the soakage line is steep,and the worse the excavation stability is.