土工基础

›› 2019, Vol. 33 ›› Issue (4): 495-499.

• 工程实录 • 上一篇    下一篇

穿越破碎带的隧道围岩数值模拟及稳定性评价

王建   

  1. （武汉鑫地岩土工程技术有限公司，武汉 430000）
  • 收稿日期:2019-07-04 修回日期:2019-07-11 出版日期:2019-08-20 发布日期:2019-08-16
  • 作者简介:王 建（1986-），男，硕士，工程师，研究方向为岩土勘察、边坡及基坑设计。

Numerical Simulation and Stability Evaluation of a Tunnel Through Fracturing Rock Mass Zone

WANG Jian   

  1. (Wuhan Xindi Geotechnical Engineering Co. Ltd., Wuhan 430000)
  • Received:2019-07-04 Revised:2019-07-11 Online:2019-08-20 Published:2019-08-16

摘要： 结合西南地区已建的瑶寨隧道，利用连续介质分析方法(FLAC3D)，针对不同支护手段及开挖工况，对穿越破碎带的瑶寨隧道不同范围的隧道围岩岩体进行数值模拟。同时对比隧道施工过程中的位移监测数据，分析评价破碎带对围岩稳定性的影响，为采取合适的围岩支护方式提供依据。结果表明：破碎带的存在直接影响隧道在破碎带及周边一定范围的围岩稳定性，特别是破碎带附近拱顶、拱肩的主应力出现应力集中现象最为显著。因此在这些地方需加强围岩监测及掌子面超前地质预报，特别在应力集中的区域，加强初支及二衬强度，有效维护隧道安全。

关键词: 破碎带, 围岩稳定性, 数值模拟

Abstract: This paper presents a case history of numerical simulations of a completed Yaozhai tunnel through the fracturing rock zone construction process. The numerical analysis derived deformation values are compared with the monitoring measured values in the different construction process. The influence of fractured rock mass zone on the tunnel stability was also evaluated and recommendations for the appropriate tunnel supporting method were also provided throughout these evaluations. The results indicate that, the presence of the fracturing rock mass zone indeed has an adverse effect on the stability of the rock mass surrounding the tunnel. Especially, stress concentrations were identified at crest and shoulder of the tunnel. Therefore, these locations should be closely monitored, and the geological predictions should be performed at the excavation area. Both initial and secondary liners should be strengthened for the construction and operation safety of the tunnel.

Key words: fracturing rock zone, stability of rock mass, numerical simulations