合肥膨胀土地区深基坑深层土体位移监测分析

The Deep Foundation Soil Displacement Monitoring in Hefei Expansive Soil Area

为了对合肥南站地铁换乘站深基坑桩锚支护体系深层土体位移进行监测,共安装33个测斜孔,从中选择代表监测点TX54以及TX56进行数值分析,得出随着基坑深度的增加,深层土体水平位移累积量不断减小,通常在基坑顶部产生的水平位移量最大;水平位移变化率不断减小,最终趋于0mm/d。通过数值分析,同一深度处,水平位移累积量随时间的变化呈对数函数变化。

In order to monitor the deep foundation pile and anchor soil displacement of the subway transfer station,in Hefei South Railway Station 33 inclinometer holes have been installed.This paper chooses representative monitoring points TX54 and TX56to do numerical analysis,and concludes that with the depth of the pit increasing,the deep soil horizontal displacement accumulation decreases.Usually at the top of the pit,there exists the maximum horizontal displacement.The horizontal displacement change rate continues to decrease,eventually tends to 0mm/d.Through numerical analysis,it is found that the cumulative horizontal displacement varies at the relation of logarithm function with time in the same soil depth.