土工基础

土工基础 ›› 2021, Vol. 35 ›› Issue (6): 723-727.

• 专题论述 • 上一篇    下一篇

基于数值模拟的顶部岩溶隧道围岩稳定性分析

陈春玲1，许 培2   

  1. （1.河南理工大学 资源环境学院，河南焦作 454000；2.中铁二院工程集团有限责任公司，成都 610031）
  • 收稿日期:2021-08-21 修回日期:2021-09-08 出版日期:2021-12-30 发布日期:2021-12-24
  • 作者简介:陈春玲（1996-），女，硕士研究生，主要研究方向为工程地质、水文地质。

Numerical Stability Analysis of Rock Mass at the Crest of a Tunnel

CHEN Chunling1， XU Pei2   

  1. (1.School of Resources and Environment, Henan Polytechnic University, Jiaozuo 45400；
    2.China Railway Eryuan Engineering Group Co. Ltd., Chengdu 610031)
  • Received:2021-08-21 Revised:2021-09-08 Online:2021-12-30 Published:2021-12-24

摘要： 隐伏溶洞对隧道安全施工具有重要影响，以某隧道为例，采用FLAC3D研究不同直径、距离下的顶部溶洞对隧道围岩稳定性的影响。结果表明：隧道发生突水、涌水的安全距离约为6 m，隧道周边变形主要是以竖向位移量为主。当溶洞与隧道的距离大于2~3倍溶洞半径范围时，对隧道的影响将会减弱。两者之间距离每增加2 m，其塑性区体积约减少15.3%~12.4%，而在分界以外塑性区体积约减少8.5%~6.7%。经过统计分析，得出拱顶沉降位移与溶洞大小分布之间的线性规律，对类似工程施工具有一定的借鉴意义。

关键词: 岩溶, 隧道, 围岩稳定性, 数值模拟

Abstract: Hidden caves have an important impact on the safety of the tunnel excavation. The FLAC3D software was used to investigate the influence of karst rock cavities with different diameters and distance to the tunnel crest on the rock mass surrounding the tunnel. The results show that the safe distance of the karst rock cavity to the tunnel from the groundwater intrusion is about 6 meters, and the deformation around the tunnel due to the rock cavity is mainly in the vertical displacement. When the distance between the cavity and the tunnel is greater than 2 to 3 times the radius of the karst cavity, the influence on the tunnel will be weakened. When the distance between the two increases by every 2 meters, the volume of the plastic zone φ decreases to approximately 15.3%~12.4%, while the volume of the plastic zone outside the boundary decreases approximately 8.5%~6.7%. After these statistical analyses, the linear relationship between the settlement and displacement of the tunnel crest and the size distribution of the karst rock cavity is obtained, which provides references for the design and construction of similar projects.

Key words: karst rock, tunnel, rock mass stability, numerical simulation

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