土工基础

›› 2017, Vol. 31 ›› Issue (5): 628-632.

• 工程实录 • 上一篇    下一篇

不同车道数偏压浅埋隧道的稳定性对比分析

刘治军 1，朱苦竹 1,2，王 阳 1   

  1. （1.桂林理工大学土木与建筑工程学院，广西桂林 541004；2.广西岩土力学与工程重点实验室，广西桂林 541004）
  • 收稿日期:2016-11-13 修回日期:2016-11-25 出版日期:2017-10-20 发布日期:2017-10-29
  • 作者简介:刘治军（1989-），男，硕士，研究方向为隧道及地下工程。
  • 基金资助:

    国家自然科学基金（41102202）

Stability Evaluations of Shallow Buried Highway Tunnels under Unbalanced Geostress with Different Traffic Lanes

LIU Zhijun1, ZHU Kuzhu1,2 , WANG Yang1   

  1. (1.College of Civil and Architectural Engineering, Guilin University of Technology, Guilin,541004;
    2.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin,541004)
  • Received:2016-11-13 Revised:2016-11-25 Online:2017-10-20 Published:2017-10-29

摘要： 偏压浅埋隧道受力特殊，所处工程地质环境复杂，荷载与抗力不明确。隧道车道数的不同使隧道围岩受力、位移产生了变化，在偏压浅埋情况下更加复杂。以广东龙头山隧道工程为背景，在相同偏压浅埋条件下选取单个隧道研究，对二车道、三车道、四车道的公路隧道用FLAC3D软件进行数值模拟对比分析，研究不同车道数隧道的开挖对围岩稳定性的影响。结果表明：隧道围岩竖向与横向位移随车道数的增加而增加；隧道两侧围岩受到的压应力和拱顶、拱底围岩受到的拉应力都是车道数越多受力越大；三种隧道的塑性区都到达了地表，形状大致相似，且车道数越少受影响区域越小；综合应力、位移、塑性区、变形来看，三车道隧道受偏压影响最大，二车道相对最为安全。

关键词: 隧道工程, 车道数, 浅埋偏压, 塑性区

Abstract: The shallow buried tunnels under unbalanced geostresses in complex geological conditions exist uncertainties. Different traffic lanes in the highway tunnel will result in the change of stress and strain states in the rock mass. This paper presents the parametric studies of two through four traffic lanes of shallow burred highway tunnels under the same unbalanced geostresses by using FLAC3D commercial software. The effect of traffic lanes on the stability of rock mass during the tunnel excavation. The results indicate that, with the increase of traffic lanes in the tunnel, both the vertical and horizontal deflections in the rock mass increase. The pressures at the both sides, crest and bottom of the excavated tunnels are increasing with the increase of traffic lanes. The plastic zones in the rock mass of tunnels with all three different traffic lanes have extended to the ground surface with similar shapes. Tunnels with less traffic lanes are more stable with a smaller plastic zone. From the stress, strain plastic zone and deformation in the surrounding rock mass point of view, tunnels with three traffic lanes under the unbalanced geostresses will have a least performance and the tunnels with two lanes perform better.

Key words: Tunneling Engineering, Traffic Lanes, ShallowBuried Tunnel with Unbalanced Geostresses, Plastic Zones