上海交通大学学报(自然版) ›› 2011, Vol. 45 ›› Issue (05): 634-638.

• 交通运输 • 上一篇    下一篇

地裂缝隧道衬砌结构与围岩相互作用机理

邵生俊, 佘芳涛, 郑万坤   

  1. (西安理工大学 岩土工程研究所, 西安 710048)
  • 收稿日期:2010-10-15 出版日期:2011-05-30 发布日期:2011-05-30
  • 基金资助:

    国家自然科学基金项目(10872161),陕西省黄土力学与工程重点实验室基金项目

Analysis on Interaction Mechanism between Tunnel Structure and
Surrounding Soil under Action of Vertical Groundfissure

 SHAO  Sheng-Jun, SHE  Fang-Tao, ZHENG  Wan-Kun   

  1. (Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China)
  • Received:2010-10-15 Online:2011-05-30 Published:2011-05-30

摘要:  针对台凹型活动地裂缝正交区间隧道,通过有限差分数值方法模拟地裂缝区间隧道的开挖施工、分缝衬砌结构与地裂缝上下盘之间相对错动,从地表和衬砌的沉降位移、围岩位移场、围岩土压力以及衬砌结构内力方面分析了隧道结构与围岩的变化特征.结果表明:台凹型活动地裂缝不均匀变形主要发生在上盘内地裂缝一定范围的地层内;分缝衬砌结构端部的拱顶土压力呈现出集中增大和减小的变化特征,上盘内地裂缝附近仰拱底的土压力出现松弛;变形缝两侧衬砌结构的端部出现轴向应力集中现象.分缝衬砌结构一方面能够适应地裂缝错动位移,避免结构内力过大而引起强度破坏;另一方面,能够抑制地层的不均匀沉降变形,使得地裂缝处变形缝两侧衬砌结构的相对位移减小,并改善地裂缝区间隧道的运行条件.

关键词:  , 地裂缝; 台凹型; 地铁隧道; 数值模拟

Abstract:  The displacement input condition was obtained by the sunken settlement distribution character of ground fissure. The excavation construction, lining structure section and largedisplacement of ground fissure passed vertically by a subway tunnel were simulated by the numerical calculation of DFM. The characteristics of tunnels structure and surrounding soil mass were analyzed by strata settlement, lining structure sections displacement, earth pressure on lining structure and its internal forces. The research indicates that in the condition of ground fissure movement with sunken character, settlement deformation happens mainly in the soil mass located above the ground fissure. The vertical earth pressure under the bottom of lining structure located in the soil mass above ground fissure significantly reduces. The axial stress at the end of lining structure sections increases remarkably. On the one hand, the clearance between lining structure sections can adapt the ground fissure movement and avoid the failure of lining structure, on the other hand, the lining structure sections can inhibit the deformation of strata with active ground fissure, and reduce the relative displacement adjacent lining structure sections at fissure. The measure of tunnel with lining structure section would improve the operation conditions of the ground fissure subway tunnel.

Key words: ground fissure, platform concave model, subway tunnel, numerical simulation

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