西安科技大学学报2023，Vol.43Issue(6)：1063-1070,8.DOI:10.13800/j.cnki.xakjdxxb.2023.0604
坚硬顶板回采巷道矿压显现规律及煤柱优化
Mine pressure behavior law and coal pillar optimization in hard roof mining roadway
摘要
Abstract
In order to study the reasonable roadway pillar width under the condition of shallow buried deep hard thick roof,the response characteristics of surrounding rock stress during the whole mining process of the working face were analyzed based on the field measured data,and the evolution law of coal pillar stress distribution was studied.A two-dimensional discrete element model with different coal pillar widths was established by using numerical simulation software,and the distribution law of sur-rounding rock stress and plastic zone under different coal pillar widths was discussed.The results show that the lateral suspension of the coal pillar is the main reason for the strong stress response of the sur-rounding rock of the tunnel.The rock strata at different layers of the 124～405.6 m lagging working face roof move strongly,and the force of the anchor rod and cable near the coal pillar side roof changes greatly,with a maximum amplitude of 54 kN.When the lagging working face distance is greater than 405.6 m,the force of the anchor rod and cable tends to be stable basically.The deformation of the sur-rounding rock of the tunnel is mainly caused by floor heave,and the amount of floor heave accounts for over 95％of the displacement of the top and bottom floors.The stress distribution of the coal pillar ex-hibits a"single peak"distribution feature,with peak stress distribution within the range of 8～14 m.Theoretical calculations have shown that the critical width of the coal pillar is 17.6 m;Numerical simu-lation shows that when the width of the coal pillar is 18 m,the distribution of stress and plastic zone in the coal pillar can meet the requirements of maintaining tunnel stability.Theoretical calculation and nu-merical simulation comprehensive analysis have determined a reasonable coal pillar width of 18 m un-der similar conditions.Based on the distribution characteristics of the roof strata,the support and unloa-ding collaborative control technology has been proposed to further optimize the width of the coal pillar.关键词
坚硬厚顶板/动压巷道/煤柱优化/采动应力Key words
hard and thick roof/dynamic pressure roadway/coal pillar optimization/mining-induced stress分类
矿业与冶金引用本文复制引用
华照来,程利兴,任建超,冯裕堂,刘茂福,汪占领..坚硬顶板回采巷道矿压显现规律及煤柱优化[J].西安科技大学学报,2023,43(6):1063-1070,8.基金项目
国家自然科学基金项目(52274123) （52274123）
中煤科工开采研究院有限公司青年基金项目(KCYJY-2023-QN-04) （KCYJY-2023-QN-04）
中煤科工开采研究院有限公司科技创新基金项目(KCYJY-2023-MS-07) （KCYJY-2023-MS-07）
