摘要
针对深埋软岩巷道揭煤段掘进过程中围岩变形控制的问题,以石垭口煤矿1790回风石门为背景开展研究。首先,依据现场工程地质调查与实测结果分析了巷道揭煤段变形破坏特征;其次,采用理论分析与数值模拟等综合研究手段,揭示了深埋软岩巷道揭煤段大变形破坏机理;第三,基于开挖补偿力学效应和NPR(negative Poisson's ratio)长、短锚索耦合控制机理,提出了以NPR长、短锚索为核心的高预应力恒阻耦合控制技术;最后,通过数值模拟的手段验证了该方案的合理性。研究结果表明:巷道存在围岩变形严重、支护结构破断失效和巷道维护成本高等特征;巷道失稳破坏的根源在于围岩强度低且破碎严重、原支护结构不耦合以及支护强度不足;本文提出全断面“NPR长、短锚索+底角注浆锚杆+反底拱”的控制方案与参数。现场工业性试验中,NPR支护段较普通支护段围岩变形减小300~500 mm,NPR锚索受力最终稳定为340 kN左右。高预应力恒阻耦合支护方案可有效控制深埋软岩巷道揭煤段围岩大变形,为揭煤段围岩安全稳定控制提供了新支护手段。
The study was conducted to address the challenge of controlling rock deformation during the excavation process of deep-buried soft rock roadway in the uncovering coal section,and the 1790 return air stone gate of the Shiyakou Coal Mine was used as the research site.Firstly,the deformation and failure characteristics of the uncovering coal section of the roadway were analyzed and determined through on-site engineering geological investigation and measurement analysis.Secondly,comprehensive research methods were employed,such as theoretical analysis and numerical simulation,to reveal the mechanisms that lead to large deformation and failure of the uncovering coal section in the deep-buried soft rock roadway.Thirdly,a high prestressed constant resistance coupling control technology was proposed,using NPR(negative Poisson's ratio)long and short anchor cables as the core.This technology was developed based on the excavation compensation mechanical effect and the coupling control mechanism of the anchor cable.Finally,the rationality of the proposed scheme was verified through numerical simulation.The results show that the roadway exhibits significant rock deformation,supporting structure failure and high maintenance costs.The instability and failure of the roadway are attributable to low strength and severe fragmentation of the surrounding rock,insufficient support strength,and lack of coupling of the original support structure.The study presents a control scheme and parameters consisting of"NPR long and short anchor cables+bottom corner grouting anchor rods+inverted arch".In the on-site industrial test,the NPR support section decreases the rock deformation of the ordinary support section by 300-500 mm and the final stable force of the NPR anchor cable is approximately 340 kN.The high prestressed constant resistance coupling support scheme can effectively manage the significant deformation of the surrounding rock in deep-buried soft rock roadway,providing a new support method for controlling the surrounding rock in the uncovering coal section.
作者
孙晓明
姜铭
赵文超
缪澄宇
张勇
郭波
SUN Xiaoming;JIANG Ming;ZHAO Wenchao;MIAO Chengyu;ZHANG Yong;GUO Bo(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第6期2282-2297,共16页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51874311,51904306)
中央高校基本科研业务费专项资金资助项目(2022YJSSB03)。
关键词
深埋软岩巷道
揭煤段
高预应力
NPR长、短锚索
开挖补偿力学效应
deep-buried soft rock roadway
uncovering coal section
high prestressed
NPR long and short anchor cable
excavation compensation mechanical effect
