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隧道建设(中英文) ›› 2019, Vol. 39 ›› Issue (S2): 8-16.DOI: 10.3973/j.issn.2096-4498.2019.S2.002

• 研究与探索 • 上一篇    下一篇

隧道穿越倾斜煤层采空区段施工力学特征分析

张志沛1, 贺阳阳1, *, 梁健刚1, 任建军2, 赵军2, 付刚飞2   

  1. 1. 西安科技大学地质与环境学院, 陕西 西安 710054 2. 中交通力建设股份有限公司, 陕西 西安 710075
  • 收稿日期:2019-09-06 出版日期:2019-12-31 发布日期:2020-04-04
  • 作者简介:张志沛(1961—),男,青海西宁人,2008年毕业于西安科技大学,地质工程专业,博士,教授,主要从事地质工程、岩土力学、采空区勘察治理等研究工作。 E-mail: 584997126@qq.com。 *通信作者: 贺阳阳, E-mail: 563669963@qq.com。
  • 基金资助:
    贵州省交通运输厅科技项目(2015-122-044)

Mechanical Property Analysis of Constructing Tunnel Underlying Inclined Coal Minedout Area

ZHANG Zhipei1 HE Yangyang1 * LIANG Jiangang1 REN Jianjun2 ZHAO Jun2 FU Gangfei2   

  1. (1. College of Geology and Environment Xian University of Science and Technology Xian 710054 Shaanxi China;2. Zhongjiao Tongli Construction Co., Ltd., Xian 710075Shaanxi China)

  • Received:2019-09-06 Online:2019-12-31 Published:2020-04-04

摘要:

为研究隧道穿越倾斜煤层采空区段时,采空区围岩的力学变化对隧道超前加固措施及支护结构的影响,采用Flac 3D软件模拟计算隧道穿越采空区的各施工阶段,分析采空区围岩施工力学特征的动态变化过程及隧道支护结构的受力特征。结果表明: 1)隧道在穿越上覆煤层采空区时,采用超前小导管注浆加固能有效阻止围岩的变形破坏; 2)中隔壁拆除后,初期支护结构承担了大部分围岩应力,拱腰及拱脚部位最小主应力值分别增加了13%41.3%,改善了隧道结构的受力条件; 3)在采空区段锚杆轴力最大值为226 kN,发挥了很好的锚固作用; 4) 隧道穿越下伏煤层采空区时,采用填石注浆的加固改善比例为154.3%,治理措施较为合理。隧道二次衬砌结构的施作更是隧道安全的保障。

关键词: 高速公路隧道, 煤层采空区, 数值模拟, 超前小导管, 力学特征

Abstract: In order to study the influence of mechanical changes of surrounding rock on coalmined areas, Flac 3D is used to simulate different phases of tunnel construction and demonstrate the mechanical variation of surrounding rocks and stress characteristics of support structures. The following results can be concluded that: (1) Grouting reinforcement with leading conduit can prevent surrounding rock deformation when the tunnel constructs underlying coal minedout area. (2) Primary support structure bears most of the surrounding rock stress after removing center diaphragms, and the minimal principle stresses at hance and arch foot section increase 13% and 41.3% respectively, which improves the stress condition of tunnel structure. (3) The bolted in minedout area can provide maximum axial force 226 kN, which anchors effectively. (4) When the coal minedout area underlies the construction tunnel, the method of rock filling and grouting helps to reduce displancement by proportion of 154.3%. Besides, the application of secondary lining structure improves the safety of tunnel construction.

Key words: highway tunnel, coal minedout area, numerical simulation, leading conduit, mechanical property

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