卵石地层基坑工程地下水回灌应用及研究  

Application and research of groundwater recharge in pebble formation foundation pit engineering

作　　者：贺诗选 李涛涛 张波 He Shixuan;Li Taotao;Zhang Bo(Beijing Aidi Geological Engineering Technology Co.,Ltd.,Beijing 100144,China)

机构地区：[1]北京爱地地质工程技术有限公司,北京100144

出　　处：《山西建筑》2025年第8期73-78,共6页Shanxi Architecture

摘　　要：以北京市丰台区某基坑支护及地下水控制工程为依托开展回灌试验,实现了抽排水100%的回灌,单井回灌速率最大为8400 m^(3)/d,群井回灌速率即基坑疏干水量最大为31824 m^(3)/d,验证了在深厚卵石层中进行水资源保护型回灌的可行性。单井回灌试验结果表明设计回灌速率应以现场试验为准,其试验值远小于理论计算值。气动潜孔锤工艺相比泥浆护壁旋挖工艺更适合回灌井的施工,采用这种工艺的回灌井相比类似工程回灌速率更高。回灌区和基坑周边水位有较大幅度的变动,远离回灌区和基坑的区域水位变化很小,回灌区朝基坑方向的水力梯度最大,表明这是地下水流回基坑的主要通道,流场图以回灌区和基坑为中心、水流线均形成封闭和循环,地下水控制设计时需考虑这种影响。Research tests based on a foundation pit and groundwater control project in Fengtai District,Beijing,a recharge test was carried out to achieve 100%recharge of pumping water.The maximum recharge rate for a single well was 8400 m^(3)/d,and the maximum recharge rate for a group of wells,i.e.the maximum amount of water drained from the foundation pit,was 31824 m^(3)/d.This verified the feasibility of water resource protection recharge in deep gravel layers.The results of the single well recharge test indicate that the design recharge rate should be based on on-site testing,and the experimental values are much lower than the theoretical calculated values.The pneumatic DTH process is more suitable for the construction of recharge wells compared to the mud wall protection rotary excavation process,and the rate of recharge wells using this process is higher than that of similar projects.There is a significant fluctuation in the water level around the return irrigation area and foundation pit,while the water level changes very little in areas far away from the return irrigation area and foundation pit.The hydraulic gradient of the return irrigation area towards the foundation pit is the largest,indicating that this is the main channel for groundwater flow back to the foundation pit.The flow field diagram is centered around the return irrigation area and foundation pit,and the water flow lines form a closed and circulating system.This influence needs to be considered in the design of groundwater control.

关 键 词：卵石层 基坑工程 地下水控制 水资源保护 地下水回灌 地下水流场 

分 类 号：TU463[建筑科学—结构工程]