采矿与岩层控制工程学报2024，Vol.6Issue(2)：1-12,12.
综放面"双硬"煤层临空煤柱宽度及承载强度校核
Width and bearing strength check of "two hard" coal pillar in fully mechanized caving face
单成方 1尚会杨 1张强 2李亚锋 1刘伟 1黄鹏2
作者信息
- 1. 库车县榆树岭煤矿有限责任公司, 新疆 库车 842000
- 2. 中国矿业大学 矿业工程学院, 江苏 徐州 221116
- 折叠
摘要
Abstract
In coal seams characterized by"two hard"features,the determination of the limit size for protective coal pillars diverges from the standard approach for conventional working faces.This study,using the gob-side entry driving roadway of the 505 working face in Yushuling Coal Mine as a backdrop,first involved testing the mechanical properties of coal and rock samples and their compressive strength across various height-to-diameter ratios to establish peak strength curves.Subsequently,by analyzing the overlying rock structure model and constructing a mechanical model for the coal pillar roof in gob-side entry driving,the study identified the load stress experienced by coal pillars of varying widths.A numerical model for coal pillars with different aspect ratios was developed,yielding an ultimate strength verification formula for these pillars.Upon comparing the load stress and ultimate strength across different coal pillar widths,it was determined that a width of 4 meters for the coal pillar suffices to meet support requirements.Based on these findings,a support technology for gob-side entry driving is proposed.Field monitoring results indicate that with a coal pillar width of 4 meters,the overall deformation of the roadway is minimal,ensuring effective maintenance of roadway stability.The research provides a reference for determining the optimal width of small coal pillars in coal seams with"two hard"charac-teristics.关键词
"双硬"煤层/沿空掘巷/区段煤柱/支承应力/巷道稳定Key words
"two hard" coal seam/gob-side entry driving/section coal pillar/bearing stress/roadway stability分类
矿业与冶金引用本文复制引用
单成方,尚会杨,张强,李亚锋,刘伟,黄鹏..综放面"双硬"煤层临空煤柱宽度及承载强度校核[J].采矿与岩层控制工程学报,2024,6(2):1-12,12.
