南京地铁某深基坑围护缺陷加固处理及降水技术研究  

Study on reinforcement treatment of enclosure defects and descending technology of a deep foundation pit in Nanjing subway

作　　者：卢姚 白博宇 李青青 关鹏[3,4] LU Yao;BAI Bo-yu;LI Qing-qing;GUAN Peng(Shanghai Tunnel Engineering Co.,LTD.,Nanjing 210000,China;Wuhan Zhongdi Hengda Technology Co.,LTD.,Wuhan 430074,China;China University of Geosciences(Wuhan),Wuhan 430074,China;Engineering Research Center of Rock-Soil Drilling&Excavation and Protection,Ministry of Education,Wuhan 430074,China)

机构地区：[1]上海隧道工程有限公司,江苏南京210000 [2]武汉中地恒达科技有限公司,湖北武汉430074 [3]中国地质大学(武汉),湖北武汉430074 [4]岩土钻掘与防护教育部工程研究中心,湖北武汉430074

出　　处：《地下水》2024年第4期21-23,38,共4页Ground water

基　　金：地铁深基坑围护结构缺陷加固处理及降水技术研究(202212),岩土钻掘与防护教育部工程研究中心开放研究基金(202311)。

摘　　要：基坑围护结构在工程建设中起着挡土、稳固坑底以及截水的作用,保证施工周边环境的安全以及工程施工的安全。以南京地铁某深基坑围护结构缺陷加固工程为研究对象,针工程所在地其特殊复杂地质条件,结合区域勘察报告,设计采用MJS满堂加固+轻型井点降水方案对结构进行加固处理,以MJS工法桩形成的水泥加固土置换原状土,从而起到隔水和提高加固区域土体稳定性的作用。加固结果表明,本设计方案施工效果显著,施工过程中未出现失稳、突水涌水及渗漏等情况。本研究对类似基坑工程围护缺陷加固处理具有一定参考价值。Pit enclosure structure in engineering construction plays a role in retaining soil,stabilizing the bottom of the pit and intercepting water to ensure the safety of the construction surrounding environment and the safety of engineering construction.Nanjing metro a deep foundation pit enclosure structure defects reinforcement project as the object of study,needle project site its special complex geological conditions,combined with regional survey report,the design of the MJS full Hall reinforcement+light well point precipitation programme for structural reinforcement treatment to MJS work piles formed by the cement reinforcement soil replacement of the original soil,so as to play a role in isolating the water and improve the stability of the soil in the reinforced area.Reinforcement results show that the construction effect of this design scheme is remarkable,and there is no instability,sudden water surge and leakage during the construction process.This study has some reference value for the reinforcement treatment of enclosure defects in similar pit projects.

关 键 词：基坑 围护结构 加固处理 MJS工法 轻型井点降水 

分 类 号：P641.2[天文地球—地质矿产勘探] TU46[天文地球—地质学]