深基坑工程降水技术设计和地面沉降控制措施

On Dewatering Technology Design & Surface Subsidence Control Measures of Deep Foundation Pit Project

通过工程实例,介绍深基坑工程中降水技术的设计、计算方法及地面沉降的控制措施。根据场地工程地质及水文地质条件,计算出基坑涌水量,并设计抽水井;然后根据降水深度要求及土层渗透系数,选择井点降水方法,确定井径、井深、单井涌水量及井数。对降水引起地面沉降因素进行分析,指出控制地面沉降的措施。对于深基坑的降水技术设计具有重要的指导意义。

Through engineering cases,the design and calculation methods of dewatering technology in deep foundation pit project and control measures for land subsidence are introduced.According to engineering geological and hydro-geological conditions on site,water inflow of foundation pit is calculated and pumping well is designed,then in accordance with the depth required for precipitation and soil permeability coefficient,dewatering method of well point is chosen,also the diameter and depth of the well,water inflow of single well and the number of wells are determined.The factors for surface subsidence caused by dewatering are introduced and control measures of surface subsidence are pointed out,which have an important significance for the dewatering technology design of deep foundation pit.