长壁放顶煤工作面沿空巷道的变形破坏机理

Deformations and failures of goaf-side entries driving adjacent to longwall top coal caving panel

王浩森 ¹何满潮 ²王炯 ²王瑞 ³明灿 ⁴朱道勇 ⁵马资敏⁶

扫码查看

作者信息

1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing 100083,China;NBK Institute of Mining Engineering,University of British Columbia,Vancouver BC V6T 1Z4,Canada;Mining Engineering and Geology College,Xinjiang Institute of Engineering,Urumqi 830023,China
2. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing 100083,China
3. Mining Engineering and Geology College,Xinjiang Institute of Engineering,Urumqi 830023,China
4. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing 100083,China;Department of Earth Sciences,University of Florence,Firenze 50121,Italy
5. College of Water&Architectural Engineering,Shihezi University,Shihezi 832003,China
6. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing 100083,China;School of Resource and Environmental Engineering,Shandong University of Technology,Zibo 255000,China
折叠

摘要

本文利用物理和数值模型研究了长壁放顶煤工作面沿空巷道的变形和破坏机理.物理模型实验表明,长壁放顶煤工作面沿空巷道的变形破坏过程可分为四个阶段:初始变形阶段Ⅰ(相邻工作面后方-47～45 m)、快速变形阶段Ⅱ(45～150 m)、变形稳定阶段Ⅲ(150～240 m)和压实稳定阶段Ⅳ(工作面后方240 m外).值得注意的是,长壁放顶煤工作面沿空巷道围岩的大变形主要发生在快速变形阶段Ⅱ和变形稳定阶段Ⅲ.这主要是由沿空巷道上方的侧向悬臂梁结构旋转下沉过程中产生的应力集中造成的.因此,本文提出了一种创新方法,使用顶板预裂技术来优化巷道顶板结构,控制长壁放顶煤工作面沿空巷道围岩的大变形并自动留巷.数值模拟和现场应用表明,使用顶板预裂自动留巷技术后,长壁放顶煤工作面沿空巷道实体煤帮的支承压力、顶底板变形量和两帮变形量分别降低了6.49%、79.25%和60%.因此,顶板预裂自动留巷技术可以有效控制长壁放顶煤工作面沿空巷道的围岩大变形.本文所提出的长壁放顶煤工作面顶板预裂自动留巷技术可以为厚及特厚煤层综放工作面使用切顶卸压无煤柱自成巷技术提供参考.

Abstract

This paper utilizes physical and numerical model experiments to study the deformation and failure mechanisms of goaf-side entries driving adjacent to longwall top coal caving(GEDLTCC)panel.The physical model experiment reveals that the deformation and failure process of GEDLTCC can be divided into four stages:initial deformation stage Ⅰ(-47 m to 45 m behind the adjacent panel),rapid deformation stage Ⅱ(45 to 150 m),deformation stabilization stage Ⅲ(150 to 240 m)and compaction stabilization stage Ⅳ(beyond 240 m).Notably,large deformation of the GEDLTCC surrounding rock primarily occurs during stages Ⅱ and Ⅲ.This deformation is primarily attributed to the stress concentration resulting from the lateral cantilever beam structure above the goaf-side entry.Therefore,this paper proposed an innovative approach that employs roof pre-splitting technology to optimize the roof structure,thereby controlling the large deformation of GEDLTCC and automatically retaining entry.Numerical simulations and field applications show that after adopting the automatically retained entry by roof pre-splitting(ARERP)technology,the abutment pressure of the integrated coal and the convergence of roof-to-floor and two ribs were reduced by 6.49%,79.25%and 60%,respectively.Therefore,ARERP technology can effectively control the deformation of the GEDLTCC.

关键词

物理模型实验/变形机理/沿空巷道/顶板预裂

Key words

physical model experiment/deformation mechanism/goaf-side entry/roof pre-splitting

引用本文复制引用

基金项目

China Scholarship Council Program(202206430008)

国家自然科学基金(52104139)

State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology/China Universit(SKLGDUEK2132)

Science and Technology Planning of Guizhou Province,China([2020]2Y030)

Science and Technology Planning of Guizhou Province,China([2020]2Y019)

Science and Technology Planning of Guizhou Province,China([2020]3007)

Science and Technology Planning of Guizhou Province,China([2020]3008)

Science and Technology Planning of Guizhou Province,China([2022]011)

Key Research and Development Special Tasks of Xinjiang Uygur Autonomous Region,China(2022B01051)

出版年

2024

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDCSCDEI

影响因子：0.47

ISSN：2095-2899

参考文献量5

段落导航