岩土力学 ›› 2022, Vol. 43 ›› Issue (S1): 521-531.doi: 10.16285/j.rsm.2021.1679

• 岩土工程研究 • 上一篇    下一篇

深井穿尖交岔点突变失稳机制分析及应用

刘小虎1, 2，姚直书1, 2，程桦1, 2，查文华3，吴捷豪1, 2   

  1. 1. 安徽理工大学 土木建筑学院，安徽 淮南 232001；2. 安徽理工大学 矿山地下工程教育部工程研究中心，安徽 淮南 232001； 3. 东华理工大学 土木与建筑工程学院，江西 南昌 330013
  • 收稿日期:2021-10-04 修回日期:2022-02-21 出版日期:2022-06-30 发布日期:2022-07-15
  • 作者简介:刘小虎，男，1986年生，博士，讲师，主要从事矿山巷道支护、地下采矿稳定性等方面研究工作。
  • 基金资助:
    国家自然科学基金面上项目（No.51964002）；安徽理工大学引进人才基金（No.13210028）；安徽理工大学校级资助重点项目（自然科学类）（No.xjzd2020-17）。

Analysis and application of catastrophe instability mechanism of intersection point in a deep roadway

LIU Xiao-hu1, 2, YAO Zhi-shu1, 2, CHENG Hua1, 2, ZHA Wen-hua3, WU Jie-hao1, 2   

  1. 1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, Anhui 232001, China; 2. Research Center of Mine Underground Engineering of Ministry of Education, Anhui University of Science & Technology, Huainan, Anhui 232001, China; 3. School of Civil and Architectural Engineering, East China University of Technology, Nanchang, Jiangxi 330013, China
  • Received:2021-10-04 Revised:2022-02-21 Online:2022-06-30 Published:2022-07-15
  • Supported by:
    This work was supported by the General Program of National Natural Science Foundation of China(51964002), the Talent Introduction Fund of Anhui University of Science and Technology of China(13210028) and the Key Projects Supported by Anhui University of Science and Technology of China(xjzd2020-17).

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摘要：

深部煤炭开采中软岩巷道围岩支护问题，尤其是软岩交岔巷道围岩稳定性长期深受关注。由交岔点变形破坏内在原因分析得出，其顶板与三角区岩柱支撑体系是交岔点失稳破坏的薄弱点。基于“等效跨度”概念并结合突变理论建立交岔点顶板−岩柱系统简化受力的尖点突变模型，获得交岔点尖点突变方程及系统失稳破坏的充要判定条件。分析了工程地质因素（埋深H、岩柱弹性模量E）、巷道交岔点结构参数（交岔角度q、巷道高度h）及支护参数a对交岔点稳定性影响。得出q、E、a与控制参数v的非线性关系存在曲率变化拐点。当q＜35º，E＜16 GPa时，控制参数v对各个因素的敏感度顺序为q＞E＞ a＞h＞H，即当围岩较软弱时交岔点稳定性受岩柱强度影响较为强烈，交岔点设计角度不宜小于35º。当q≥35º，E≥16 GPa时，敏感度顺序为h＞H＞q＞a＞E，即当岩柱强度较高时交岔点稳定性受结构参数影响较大。结合丁集矿深井软岩工程实例，采用理论分析指导交岔点设计参数优化。矿压监测数据表明，优化支护设计有效地控制了西三轨回联巷交岔点围岩变形，验证了理论推导方法的正确性。

关键词: 深部巷道工程, 穿尖交岔点, 尖点突变模型, 敏感性分析, 工程应用

Abstract:

The problem of surrounding rock support of soft rock roadway in deep coal mining, especially the stability of surrounding rock of soft rock intersection roadway, has been concerned for a long time. From the analysis of the internal causes of the deformation and failure of the intersection, it is concluded that the roof and the rock pillar support system in the triangle area are the weak points of the instability and failure of the intersection. Based on the concept of ‘equivalent span’ and catastrophe theory, a cusp catastrophe model of the roof rock-column system at the intersection is established and the cusp catastrophe equation at the intersection and the necessary and sufficient judgment conditions for the instability and failure of the system are obtained. The effects of engineering geological factors (buried depth H and elastic modulus of rock column E), structural parameters of roadway intersection (intersection angle q and roadway height h) and support design parameters a on the stability of intersection are analyzed. It is concluded that the non-linear relationship between q, E, a and the control parameter v has a curvature change inflection point. When q <35º and E<16 GPa, the sensitivity order of control parameters to various factors is: q >E>a>h>H, that is, when the rock column is weak, the stability of the intersection is strongly affected by the strength of the rock column, and the design angle of the intersection should not be less than 35º. When q≥35º and E≥16 GPa, the order of sensitivity is: h>H>q >a>E, that is, when the strength of surrounding rock is high, the stability of intersection is significantly affected by structural parameters. Combined with the example of deep well soft rock engineering in Dingji mine, theoretical analysis is used to guide the optimization of design parameters of intersection. The ground pressure monitoring data show that the optimized support design effectively controls the surrounding rock deformation at the intersection of the west third track back link roadway, and verifies the correctness of the theoretical derivation.

Key words: deep roadway engineering, intersection point, cusp catastrophe model, sensitivity analysis, engineering application

中图分类号: TD32
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