工程降水引起基坑及土体变形机理、规律及控制策略研究

Research on the Mechanism,Regularity,and Control Strategy of Foundation Pit and Soil Deformation Caused by Engineering Precipitation

为了解决深基坑工程开挖过程中由于工程降水导致的基坑围护结构和土体变形控制难题,本文以山东省济南市某高层小区深基坑工程开挖为研究对象,运用数值仿真模拟的手段建立基坑降水模型,研究工程降水引起基坑和土体变形的机理及瑰丽,并提出相应的控制策略。研究结果表明,对潜水降水时,在基坑内降水结束后,除地表处的土体沉降变形不变外,其余深度范围内的土体变形呈现抛物线的变化趋势;随着深度的增加,基坑土体的沉降不断增加。降水孔间隔和降深均会对围护结构的水平位移产生明显的影响,但降水孔间隔对围护结构的水平位移主要在间隔较小时影响较大,可以通过调整水位的降深和降水孔间隔达到控制后围护结构变形的目的。

In order to solve the problem of controlling the deformation of the foundation pit enclosure structure and soil caused by engineering precipitation during the excavation process of deep foundation pit engineering,this article takes the excavation of a high-rise residential area in Jinan,Shandong Province as the research object,uses numerical simulation to establish a foundation pit dewatering model,studies the mechanism and beauty of foundation pit and soil deformation caused by engineering precipitation,and proposes corresponding control strategies.The research results indicate that for groundwater dewatering,after the completion of dewatering in the foundation pit,except for the unchanged settlement deformation of the soil at the surface,the deformation of the soil at other depths shows a parabolic trend;As the depth increases,the settlement of the foundation pit soil continues to increase.The spacing and depth of precipitation holes will have a significant impact on the horizontal displacement of the retaining structure,but the spacing of precipitation holes mainly has a significant impact on the horizontal displacement of the retaining structure when the spacing is small.The purpose of controlling the deformation of the rear retaining structure can be achieved by adjusting the depth of water level and the spacing of precipitation holes.