富水砂层盾构始发遇困地段降水技术研究  

Research on the Dewatering Technology in Trapped Area of Shield Launching Shaft for Water-rich Sand Stratum

作　　者：熊仲明[1] 覃泽宏 张自光 蔡虹 XIONG Zhongmin;QIN Zehong;ZHANG Ziguang;CAI Hong(Xi'an University of Architecture and Technology,Xi'an,Shaanxi 710000,China;Anhui Key Laboratory of Architectural Structure and Underground Engineering,Anhui University of Architecture,Hefei,Anhui 230601,China;China Tiesiju Civil Engineering Group,Hefei,Anhui 230041,China)

机构地区：[1]西安建筑科技大学,西安710000 [2]安徽建筑大学建筑结构与地下工程安徽省重点实验室,合肥230601 [3]中铁四局集团有限公司,合肥230041

出　　处：《铁道工程学报》2022年第1期114-120,共7页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51278395);住建部科学技术基金项目(2016-k5-044);陕西省自然科学基础研究计划重点项目(2018JZ5008)。

摘　　要：研究目的:针对江苏淮安富水砂层地铁盾构始发遇困地段降水技术难题,需对现行规程中的基坑涌水量计算模型进行改进,以得到适合富水砂层地区的盾构井基坑承压水计算方法,并按改进方法设计降水方案。研究结论:(1)针对基坑内承压水降水、基坑外承压水降水两种情况,分别对涌水量计算方法和降水漏斗曲线进行了改进;(2)按改进方法实施的方案达到了预期降水效果,现场实测数据与理论计算、数值模拟结果相符,验证了改进计算方法的合理性;(3)江苏淮安地铁盾构基坑改进方案的有效实施可为类似环境下、带地连墙围护结构的深基坑降水提供借鉴与参考。Research purposes:In view of the technical difficulties of dewatering for trapped shield launching shaft in water-rich sand layer in Huai′an,Jiangsu Province,it is necessary to improve the calculation model of water inrush from foundation pit,to obtain the calculation method of confined water in foundation pit of shield tunneling well in water-rich sand stratum.The dewatering scheme is designed according to the improved method.Research conclusions:(1)In consideration of two situations:confined water dewatering inside/outside foundation pit,the calculation method of water inrush and the dewatering funnel curve are respectively improved.(2)The scheme implemented by the improved method achieves the expected dewatering effect.The field measured data are consistent with the theoretical calculation and numerical simulation results,which verifies the rationality of the improved calculation method.(3)The effective implementation of improvement scheme for shield foundation pit of Huai’an Metro in Jiangsu Province can provide reference for dewatering of deep foundation pit with diaphragm wall enclosure structure in similar environment.

关 键 词：承压水非完整井 基坑降水 地连墙 富水砂层 降水漏斗曲线 

分 类 号：TU463[建筑科学—结构工程]