淮安高铁站深基坑空间抽水试验及降水方案控制  

Pump Test and Dewatering Control Methods for the Deep Excavation of a High-Speed Railway Station in Huai’an

作　　者：洪迪思 刘兆成 柳信 HONG Disi;LIU Zhaocheng;LIU Xin(Institute of Hydrogeology and Marine Geology,Huai’an 223005;Institute of Geology and Mineral Exploration,Huai’an 223001;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071)

机构地区：[1]江苏省水文地质海洋地质勘查院,江苏淮安223005 [2]淮安市地质矿产勘查院,江苏淮安223001 [3]中国科学院武汉岩土力学研究所,武汉430071

出　　处：《土工基础》2024年第4期607-612,共6页Soil Engineering and Foundation

摘　　要：随着城市深部空间的大规模开发,基坑开挖深度愈来愈深,对受承压水影响的深基坑工程,抽水试验显得尤为重要。以淮安市高铁站枢纽空间某深基坑工程为例,全面概述了抽水试验井的设计、布置、试验方法及成果。之后采用不同计算方法对比和分析了基坑水文地质参数,确定了主要含水层渗透系数、影响半径。最后,根据基坑设定深度内的涌水量,结合基坑特点提出了管井降水方案建议,讨论和预测了降水对周边构筑物和环境的影响:①含水层实际水文参数很难仅依靠室内试验反映,需同时结合抽水试验分析。②厚含水层渗透系数较大时,为避免流砂、管涌等不良水文地质现象,建议采用大口径管井降水。The large-scale development and utilization of the urban underground space has made the excavation depth of foundation pits deeper and deeper.The pump test is particularly important for the deep excavation projects affected by the artesian water.A deep excavation project in the hub space of the Huai’an high-speed railway station is presented as a case history.A comprehensive overview of the design,point arrangements,test methods and results of the pump test wells is presented.After that,the different estimation methods are used to compare and analyze the hydrogeological parameters of the excavated area,and the permeability coefficient and the radius of the influence of the main aquifer are determined.Finally,based on the water influx within the set depth of the excavated area,recommendations for a point well precipitation program are proposed in combination with the characteristics of the excavated area.The impact of the precipitation on the surrounding structures and the environment is discussed and predicted in the paper.

关 键 词：承压水 深基坑 抽水试验 水文参数 降水工程 

分 类 号：TU473[建筑科学—结构工程]