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坚硬基本顶切顶沿空留巷的矿压显现与失稳机理

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坚硬基本顶切顶沿空留巷围岩破坏的科学控制是无煤柱开采安全高效的关键。本文综合运用现场实测、理论分析和工业试验，明晰了坚硬基本顶切顶沿空留巷的矿压显现与失稳机理。现场实测分析了切顶巷道围岩破坏、顶板塑性区发育和锚杆(索)受载的特征，结果表明巷道围岩呈现不对称破坏，巷道一次成巷阶段时和巷道二次复用阶段时的靠近切顶帮的顶底最大收敛值分别为458 mm和1120 mm。顶板离层、竖向裂隙和环向裂隙是顶板破坏的显著标志。巷道矿压显现阶段可分为巷道一次成巷阶段、巷道初次使用阶段和巷道二次复用阶段。切顶巷道围岩破坏与矿压显现阶段紧密相关。切顶关键块体运动、复杂应力环境和支护方案不匹配是巷道围岩失稳的三个主要原因。据此，提出了基于分区域和分阶段的切顶巷道围岩动态控制方案。工程实践结果表明围岩动态控制方案有效控制了围岩破坏，实现了巷道长期安全，为类似生产地质条件的切顶沿空留巷围岩科学控制提供了有益借鉴。
Ground response and failure mechanism of gob-side entry by roof cutting with hard main roof
This study is the result of long-term efforts of the authors'team to assess ground response of gob-side entry by roof cutting(GSERC)with hard main roof,aiming at scientific control for GSERC deformation.A comprehensive field measurement program was conducted to determine entry deformation,roof fracture zone,and anchor bolt(cable)loading.The results indicate that GSERC deformation presents asymmetric characteristics.The maximum convergence near roof cutting side is 458 mm during the primary use process and 1120 mm during the secondary reuse process.The entry deformation is closely associated with the primary development stage,primary use stage,and secondary reuse stage.The key block movement of roof cutting structure,a complex stress environment,and a mismatch in the supporting design scheme are the failure mechanism of GSERC.A controlling ideology for mining states,including regional and stage divisions,was proposed.Both dynamic and permanent support schemes have been implemented in the field.Engineering practice results indicate that the new support scheme can efficiently ensure long-term entry safety and could be a reliable approach for other engineering practices.

gob-side entry by roof cuttingground responsefailure mechanismfollowing mining states controlhard main roof

朱恒忠、许磊、文志杰

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State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 102209,China

State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China

School of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China

School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China

School of Mining,Guizhou University,Guiyang 550025,China

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沿空切顶留巷 矿压显现 失稳机理 围岩破坏动态控制 坚硬基本顶

Open Fund of State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,ChinaNational Natural Science Foundation of China

WPUKFJJ2019-1951974317

2024

10.1007/s11771-024-5695-3

中南大学学报(英文版)
中南大学

中南大学学报(英文版)

CSTPCDEI
影响因子：0.47
ISSN：2095-2899
年,卷(期)：2024.31(7)