煤巷弱胶结顶板稳定性分析与变形控制技术

doi:10.16285/j.rsm.2021.0286

岩土力学 ›› 2022, Vol. 43 ›› Issue (S2): 382-391.doi: 10.16285/j.rsm.2021.0286

煤巷弱胶结顶板稳定性分析与变形控制技术

余伟健^{1, 2}，李可^{1, 3}，刘泽¹，郭涵潇¹，安百富¹，王平^{1, 2}

1. 湖南科技大学资源环境与安全工程学院，湖南湘潭 411201；2. 湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室，湖南湘潭 411201；3. 贵州理工学院矿业工程学院，贵州贵阳 550003

收稿日期:2021-02-26 修回日期:2021-05-31 出版日期:2022-10-10 发布日期:2022-10-09
通讯作者: 李可，男，1986年生，博士研究生，副教授，主要从事深部岩石力学与围岩控制等方面研究和教学工作。E-mail: 20120016@git.edu.cn E-mail: ywjlah@163.com
作者简介:余伟健，男，1978年生，博士，教授，博士生导师，主要从事深部岩石力学与围岩控制等方面研究和教学工作。
基金资助:
国家自然科学基金资助项目（No.51974117，No.52174076）；湖南省自然科学基金项目（No.2020JJ4027）；贵州省科技计划项目（黔科合基础-ZK[2022]一般176）。

Stability analysis and deformation control technology for weakly cemented roof of coal roadway

YU Wei-jian^{1, 2}, LI Ke^{1, 3}, LIU Ze¹, GUO Han-xiao¹, AN Bai-fu¹, WANG Ping^{1, 2}

1. School of Resource & Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; 2. Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; 3. College of Mining, Guizhou Institute of Technology, Guiyang, Guizhou 550003, China

Received:2021-02-26 Revised:2021-05-31 Online:2022-10-10 Published:2022-10-09
Supported by:
This work was supported by the National Science Foundation of China (51974117, 52174076), the Natural Science Foundation of Hunan Province (2020JJ4027) and the Science and Technology Planning Foundation of Guizhou Province (QKHJC-ZK[2022]YB176).

摘要/Abstract

摘要： 煤层顶板为弱胶结岩体时稳定性差，常在煤炭回采过程中或巷道掘进时发生大变形或失稳等现象，维护难度较大。针对煤巷弱胶结粉砂岩顶板力学特征与变形控制等问题，以广西林场煤矿煤巷弱胶结粉砂岩顶板支护工程为工程背景，采用现场调研、实验室试验、理论分析等方法进行研究。通过现场调研，发现研究巷道有顶板岩层自承能力差、受水环境影响、支护结构失效率高、底板受水影响底鼓量大、受采动影响等特征；顶板岩石点荷载试验表明，其单轴抗压强度仅为1.9～ 2.3 MPa，采用电镜扫描发现，弱胶结粉砂岩以粗粒矿物为骨架；在普氏理论的基础上，推导了巷道顶板和两帮承压极限表达式，提出了提高巷道围岩整体强度和承载能力、确定合理的锚杆支护参数、顶板设计锚索加强支护等弱胶结巷道围岩控制要点。依据试验分析与理论研究成果，提出了以注浆加固为基础，锚杆和锚索联合支护的控制方案，并在林场煤矿进行了工业性试验。现场监测数据表明，设计的支护方案可以有效地控制煤巷弱胶结粉砂岩顶板变形。

关键词: 回采巷道, 弱胶结顶板, 围岩稳定性, 注浆加固, 联合支护技术

Abstract: The weakly cemented rock mass makes poor stability. Large deformation often occurs during coal mining or roadway excavation, which brings maintenance difficulties. To address the problems of the mechanical characteristics and deformation control of the surrounding rock of the weakly cemented siltstone, we performed the field survey, laboratory tests, theoretical analysis by selecting Linchang coalmine in Guangxi Province of China as the engineering background. On-site investigations show that the roof rock layer of roadway has poor self-supporting ability, high failure rate of supporting structure due to water effect; large floor heave occurs affected by water and mining. The point load test indicates that the uniaxial compressive strength is only 1.9−2.3 MPa. Scanning with an electron microscope reveals that the weakly cemented siltstone is based on coarse-grained minerals. According to Protodyakonov’s pressure arch theory, we derived the equations of ultimate bearing capacity of roof and two sides and put forward the key points of weakly cemented roadway surrounding rock control, including improving the overall strength and bearing capacity of roadway surrounding rock, determining reasonable bolt support parameters, designing roof anchor cable to strengthen support. Based on the results of experimental analysis and theoretical research, we proposed a control plan based on grouting reinforcement, combined with bolts and cables, and carried out industrial tests in Linchang coalmine. The monitoring data show that the designed support scheme can effectively control the deformation of the weakly cemented siltstone roadway.

Key words: mining roadway, weakly cemented roof, surrounding rock stability, grouting reinforcement, combined support technology

中图分类号:

TD353

余伟健, 李可, 刘泽, 郭涵潇, 安百富, 王平, . 煤巷弱胶结顶板稳定性分析与变形控制技术[J]. 岩土力学, 2022, 43(S2): 382-391.

YU Wei-jian, LI Ke, LIU Ze, GUO Han-xiao, AN Bai-fu, WANG Ping, . Stability analysis and deformation control technology for weakly cemented roof of coal roadway[J]. Rock and Soil Mechanics, 2022, 43(S2): 382-391.

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煤巷弱胶结顶板稳定性分析与变形控制技术

Stability analysis and deformation control technology for weakly cemented roof of coal roadway

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