西安科技大学学报2026，Vol.46Issue(2)：354-364,11.DOI:10.13800/j.cnki.xakjdxxb.2026.0211
近距离煤层群下行开采遗留煤柱下巷道布置优化与支护技术
Optimization of roadway layout and support technology under residual coal pillars for the downward mining in close-distance coal seam groups
摘要
Abstract
To address the challenges in roadway layout of close-distance coal seam groups,particularly the stress concentration from residual coal pillars in upper goafs during downward mining and the sur-rounding rock control under complex conditions of large burial depth and intercalated gangue,a com-bined approach of numerical simulation of multi-face dynamic excavation considering gangue influence and on-site engineering verification was adopted.A three-dimensional coupled model of"upper coal pillar-gangue intercalation-lower roadway"was established,and multiple layout scenarios were de-signed,including inner-offset,0 m offset,and outer-offset(with a gradient of 10～60 m).The stress transfer paths and surrounding rock deformation laws were analyzed,an optimized support technical scheme was proposed,and industrial tests were conducted.The results indicate that:Affected by the ob-struction of the gangue in the 4#coal seam,the stress in the floor of the remaining 26 m upper coal pil-lar attenuates within the gangue layer,forming a"stress buffer zone",and the stress concentration factor directly below the coal pillar decreases to 1.8.The floor stress exhibits a spatial distribution character-istic of"high concentration directly under the coal pillar-sub-high in the middle of the gob-low stress at the boundary".The maximum damage depth of the goaf floor reaches 20.29 m.When the outer offset is 40 m,the peak vertical stress of the roadway roof and floor decreases by 42％,and the convergence of the roof-floor and two sides reduces to 0.04 m and 0.276 m,respectively,which is superior to the lay-outs of inner-offset and 0 m offset.The integrated technical path of"dynamic regulation of spatial offset distance collaborative optimization of support structure"combined with the joint support system further reduces the roof-floor deformation by 60％and the two-side deformation by 17.9％.Meanwhile,the relative errors between the measured values and simulated values of roadway deformation,surrounding rock stress,and support force are all≤7％.The optimized scheme reduces the roadway maintenance cost by 28％,and no surrounding rock instability phenomena such as rib spalling or roof collapse oc-cur.The research results can provide reference for the reasonable layout and precise support of lower roadways in close-distance coal seam groups.关键词
近距离煤层/夹矸影响/应力集中/动态开挖模拟/非对称分布Key words
close-distance coal seam/gangue intercalation effect/stress concentration/dynamic excava-tion simulation/asymmetric distribution分类
矿业与冶金引用本文复制引用
孙锐..近距离煤层群下行开采遗留煤柱下巷道布置优化与支护技术[J].西安科技大学学报,2026,46(2):354-364,11.基金项目
国家自然科学基金项目(52274150) （52274150）
天地科技股份有限公司科技创新创业资金专项项目(2023-2-TD-ZD001) （2023-2-TD-ZD001）
