考虑工程降水作用的基坑渗流场影响分析——以南昌某深基坑工程为例  

Analysis of Seepage Field Influence of Foundation Pit Considering Engineering Dewatering——A Case Study of a Deep Foundation Pit Project in Nanchang

作　　者：黄明辉 HUANG Minghui(College of Architectural Engineering,Zhoukou Vocational and Technical College,Zhoukou 466000,Henan,China)

机构地区：[1]周口职业技术学院建筑工程学院,河南周口466000

出　　处：《汕头大学学报（自然科学版）》2021年第2期29-40,共12页Journal of Shantou University：Natural Science Edition

摘　　要：为研究工程降水作用下的深基坑渗流场变化规律,本文以南昌某深基坑工程为例,以降水时间函数、单井与群井降水形式、基坑降水位置、止水帷幕构造为影响因素,应用有限元分析软件Midas gts nx,研究工程降水作用下的深基坑渗流场变化规律.研究表明:1)抽水状态下,孔隙水压力变化梯度在降水井附近变化较大,孔压等值线呈现出非连续分布;2)群井降水下,孔压影响范围与地表土层沉降幅度增大,呈现明显的叠加效应;3)孔隙水压力沿止水帷幕两侧变化明显,止水帷幕可较大程度地增加地下水渗流路径,有效阻隔基坑两侧水层交流.In order to study the variation of seepage field in deep foundation pit under the action of engineering precipitation,taking a deep foundation pit project in Nanchang as an example,the influences of dewatering time function,dewatering form of single and group wells,dewatering position of foundation pit,and structure of water-stop curtain on seepage field distribution were analyzed by using finite element software Midas gts nx,the variation law of seepage field in deep foundation pit under the action of engineering precipitation is studied in this paper.The results show that:1)under pumping condition,the variation gradient of pore water pressure changes greatly around the dewatering well,and the pore pressure contours show a discontinuous distribution;2)Under group well dewatering,the influence range of pore pressure and the subsidence range of surface soil layer increase,showing obvious superposition effect.3)The pore water pressure changes significantly along both sides of the water-stopping curtain,which can increase the seepage path of groundwater to a greater extent and effectively prevent the exchange between the two sides of the foundation pit.

关 键 词：渗流场 孔隙水压力 深基坑 止水帷幕 

分 类 号：TU46[建筑科学—结构工程]