富水粉细砂层“先井后隧”施工技术研究  

Study on construction technology of Shaft before Tunnelin water rich silty sand stratum

作　　者：李自力 潘旭东 赵香萍 张志强 廖霖[2] Li Zili;Pan Xudong;Zhao Xiangping

机构地区：[1]中铁十二局集团第二工程有限公司,山西太原030024 [2]太原理工大学矿业工程学院,山西太原030024

出　　处：《现代城市轨道交通》2020年第11期54-60,共7页Modern Urban Transit

基　　金：国家自然科学基金项目(51604183);山西省自然科学基金项目(201703D111027)。

摘　　要：文章结合太原地铁2号线南中环街站—学府街站区间盾构穿越中间风井工程实例,对“先井后隧”施工技术进行阐述,其中重点阐述导台施工和盾构机进出洞工艺;采用Flac3D软件对土压平衡盾构穿越中间风井的支撑结构受力情况以及基坑周边地表沉降进行数值模拟分析,结果表明,在1道混凝土支撑和2道钢支撑的基础上,盾构机过站时左右线洞门新增钢支撑,可以有效地将基坑开挖以及盾构掘进过程中的基坑周边地表沉降控制在允许范围内,从而保证盾构安全、高效、经济地通过中间风井。Based on the project of shield passing through the middle vent-shaft between section of Nanzhonghuan Street station and Xuefu Street station of Taiyuan metro line 2,this paper expounds the construction technology of Shaft before Tunnel,which focuses on the construction of probe platform and the technology of shield entering and leaving the tunnel,using FLAC3D software to calculate the stress of the supporting structure of the earth pressure balance shield passing through the middle vent-shaft and the surface settlement around the foundation pit.The results show that,on the basis of one concrete support and two steel supports,the new steel support at the left and right tunnel portal effectively controls the foundation pit excavation and the surface settlement around the foundation pit in the process of shield tunneling,and ensures that the shield passing the middle vent-shaft safely,effi ciently and cost-effectively.

关 键 词：地铁 盾构过站 先井后隧 施工技术 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]