| 大直径盾构隧道扩挖地铁车站的力学性能研究 |
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| 引用本文： | 丁德云,鲁卫东,杨秀仁,刘维宁,颜 莓.大直径盾构隧道扩挖地铁车站的力学性能研究[J].岩土力学,2010,31(Z2):281-287. |
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| 作者姓名： | 丁德云 鲁卫东 杨秀仁 刘维宁 颜 莓 |
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| 作者单位： | 1. 北京城建设计研究总院有限责任公司，北京 100037；2. 北京交通大学 土木建筑工程学院，北京 100044； 3. 天津市市政工程设计研究院, 天津 300051 |
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| 基金项目： | 北京市科技计划重点项目资助（D0604003040921）。 |
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| 摘 要： | 日益复杂的地铁建设环境使得地铁线路布置困难、施工风险加大，同时对施工方法也提出了更为严格的要求。采用大直径盾构建造地铁单洞双线区间并在盾构隧道基础上小规模扩挖形成车站是解决复杂环境下地铁建设的一种新思路。以北京地铁14号线高家园站为背景，提出了在外径10 m的大直径盾构隧道基础上采用CRD(Cross Diaphragm)法扩挖地铁车站的两种方案，利用“地层-结构”相互作用有限元法模拟了车站扩挖施工过程，研究了结构体系的受力转换规律。结果表明：在扩挖施工中，结构受力转换频繁；结构体系的最大轴向应力位置由管片环转移到初期支护，最大剪应力位置转移到封顶块管片；管片环由受压状态为主转向受剪状态为主，初期支护、中隔板、梁柱及临时支撑以受压状态为主；封顶块管片和顶梁上部翼缘处的应力较大，应对这些位置进行加强处理。
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| 关 键 词： | 大直径盾构隧道 地铁车站 扩挖 CRD法 |
| 收稿时间： | 2010-02-01 |
Study of mechanical performance of metro station constructed by enlarging large diameter shield tunnel |
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| DING De-yun,LU Wei-dong,YANG Xiu-ren,LIU Wei-ning,YAN Mei.Study of mechanical performance of metro station constructed by enlarging large diameter shield tunnel[J].Rock and Soil Mechanics,2010,31(Z2):281-287. |
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| Authors: | DING De-yun LU Wei-dong YANG Xiu-ren LIU Wei-ning YAN Mei |
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| Institution: | 1. Beijing Urban Engineering Design and Research Institute Co., Ltd., Beijing 100037, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 3. Tianjin Municipal Engineering Design and Research Institute, Tianjin 300051, China |
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| Abstract: | A construction method that a running tunnel with two tracks is constructed by large diameter shield machine and moreover a station is built by shallow mining method to enlarge large diameter shield tunnel can be regarded as a new approach to construct metro engineering fast, efficiently, safely and economically; in more and more complicated environment which would lead to difficult layout of metro lines, increasing construction risk and making still stricter demands on construction methods of metro engineering. Taking Gaojiayuan station of Beijing metro line 14 as an engineering background, two schemes for the metro station construction by the CRD (cross diaphragm) shallow mining method to enlarge a large-size shield tunnel with an outer diameter of 10 m are introduced. Two-dimensional finite element models are used to simulate the metro station construction on the basis of the ground-structure interaction. The mechanical performance of the structure of the metro station is obtained. The numerical results show that the structural stress state varies frequently in the process of enlarged excavation. The position of maximum axial stress shifts from the shield segments to the primary lining; and the position of maximum shear stress gradually appears at the key segment. The stress state of the segments shifts from the dominative axial compression to the predominant shear. The primary lining, temporary diaphragms, top and bottom beams and temporary struts are mainly in the compressive status. Compared with other structures, the key segment and top flanges of the top beam are subjected to greater stresses during the construction; furthermore, it is suggested that they should be reinforced. |
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| Keywords: | large diameter shield tunnel metro station enlarged excavation CRD method |
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