紧邻地铁隧道上软下硬地层超深基坑施工变形控制  

Deformation Control of Ultra-Deep Foundation Adjacent to Metro Tunnel in Upper Soft and Lower Hard Strata

作　　者：张跃明 李松晏 钟久强 余金 朱碧堂 Zhang Yueming;Li Songyan;Zhong Jiuqiang;Yu Jin;Zhu Bitang(Guangzhou Metro Design&Research Institute Co.Ltd.,Guangzhou 510010,China;The First Construction Co.Ltd.of China Forth Construction Bureau,Guangzhou 510800,China;Zhejiang Provincial Transportation Planning Design Co.Ltd.,Hangzhou 310031,China;Department of Architectural Engineering,Jiangxi Water Resources Institute,Nanchang 330013,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广东广州510010 [2]中建四局第一建筑工程有限公司,广东广州510800 [3]浙江省交通规划设计研究院有限公司,浙江杭州310031 [4]江西水利职业学院建筑工程系,江西南昌330013 [5]华东交通大学土木建筑学院,江西南昌330013

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第1期61-68,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(41972291,52020105003)。

摘　　要：以紧邻深圳地铁线11号线某超深基坑工程为例,介绍上软下硬地层基坑支护结构施工和开挖过程中采取的变形控制技术,包括双重护槽和三机联动地下连续墙施工技术、坑底破碎带交替双液注浆技术、钢筋混凝土支撑轴力伺服技术等,并通过三维精细化数值模拟与监测数据的对比分析,验证上述施工技术的有效性。在此基础上探讨了基坑内支撑预加轴力影响下最大侧向变形/开挖深度关系曲线,分析其对既有地铁隧道的保护效果。Taking an ultra-deep foundation pit project adjacent to Shenzhen Metro Line 11 as an example,this paper introduced the deformation control technology adopted during the construction and excavation of the foundation pit support structure of the upper soft and lower hard strata,including the construction technology of double guard trough and three-machine linkage underground continuous wall,the alternating double liquid grouting technology of the crushing belt at the bottom of the pit,and the axial force servo technology of reinforced concrete support.Through the comparative analysis of three-dimensional refined numerical simulation and monitoring data,the effectiveness of the above construction technology was verified.On this basis,the relationship curve of maximum lateral deformation/excavation depth under the influence of pre-applied axial force in the foundation pit was discussed,and its protective effect on the existing subway tunnel was analyzed.

关 键 词：地铁隧道 超深基坑 上软下硬地层 变形控制技术 

分 类 号：U455[建筑科学—桥梁与隧道工程]