北京平原区工民建工程地下水疏排特征分析

Analysis of groundwater dewatering characteristics in industrial and civil engineering projects in Beijing plain area

为更好地了解工民建工程建设过程中地下水疏排特征,以北京市平原区作为研究区,收集2019-2021年间北京平原区工民建工程基坑开挖深度及排水规模数据,采用帕累托分析、相关性分析等方法,分析基坑开挖深度和排水规模的相关关系和规模特征。研究区工民建工程排水规模大小与所处位置水文地质条件、疏水方案密切相关;基坑开挖深度0~15 m的工程占比76%;排水规模5万m^(3)以上的工程占比14.9%,其地下水疏排量占比却高达96.6%;基坑深度与排水规模无相关性。建议基坑开挖深度超过15 m或排水规模超过5万m^(3)的工程向有管理权限的水行政主管部门备案。

In order to better understand the characteristics of groundwater dewatering in the process of industrial and civil engineering,this paper takes the plain area of Beijing as the research area,collects the data of excavation depth and dewatering scale in the process of industrial and civil engineering in the plain area of Beijing from 2019 to 2021.In addition,this paper analyzes the correlation and scale characteristics of excavation depth and dewatering scale of industrial and civil engineering in the plain area of Beijing by using Pareto and correlation analysis.The dewatering scale of industrial and civil construction projects in the study area is closely related to the hydrogeological conditions and dewatering schemes.The excavation depth of 76%projects was in the range of 0~15 m.The proportion of projects with a dewatering scale of more than 50,000 m^(3) accounted for 14.9%,while the groundwater dewatering was as high as 96.6%.There is no correlation between the depth of foundation pit and the scale of dewatering.It is suggested that projects with excavation depth of more than 15 m or dewatering scale of more than 50,000 m^(3) should be filed with water administrative departments with administrative authority.