尚帅,余忠林,孙建,等.厚煤层沿空掘巷窄煤柱宽度优化及其变形破坏特征[J].河南理工大学学报（自然科学版）,2026,45(6):51-61.

Shang S, Yu Z L, Sun J,et al.Optimization of narrow coal pillar width and deformation and failure characteristics of gob-side entries in thick coal seams[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(6):51-61.

厚煤层沿空掘巷窄煤柱宽度优化及其变形破坏特征

尚帅, 余忠林, 孙建, 贾浩

安徽理工大学 矿业工程学院，安徽 淮南 232001

摘要: 目的 为保证厚煤层沿空掘巷安全开采，开展厚煤层沿空掘巷窄煤柱宽度优化及沿空巷道围岩变形破坏特征研究。  方法 以皖北煤电集团临汾天煜恒昇煤业9106工作面为工程背景，在理论分析沿空掘巷煤柱合理留设宽度7.03~12.44 m的基础上，利用FLAC3D模拟分析煤柱宽度分别为8，9，10 m时沿空掘巷围岩应力、位移和塑性区分布特征。设计了巷道围岩位移监测、顶板裂隙分布探测和煤柱应力分布监测3种方案，利用HCZ-2型钻孔应力计、钻孔窥视仪和DDWJ-2型多点位移计等仪器，监测煤柱宽度8 m时工作面回采过程侧向支承压力分布规律与煤柱不同位置的破坏特征，分析沿空掘巷围岩位移变化规律。  结果 结果表明：9106工作面沿空掘巷窄煤柱留设宽度为8 m时，侧向支承压力从工作面侧至采空区侧整体呈现先增大再减小的分布规律；煤柱宽度为0~2.5 m和4.6~8 m时，出现较为明显的破碎裂隙和破碎带，此范围为煤柱塑性破坏区；煤柱宽度为2.5~4.6 m时，整体性较好，此范围为煤柱弹性区；2个监测点处巷道两帮最大变形速率均大于顶底板的，且沿空巷道浅部围岩位移量明显大于深部位移量。  结论 优化后的区段煤柱宽度8 m能够实现9106工作面的安全开采。

关键词:沿空巷道;破坏特征;煤柱宽度;支承压力;塑性破坏区

doi:10.16186/j.cnki.1673-9787.2024040051

基金项目:国家重点研发计划项目（2022YFF1303302）；国家自然科学基金资助项目（51974010）

收稿日期:2024/04/25

修回日期:2025/03/03

出版日期:2026/10/09

Optimization of narrow coal pillar width and deformation and failure characteristics of gob-side entries in thick coal seams

Shang Shuai, Yu Zhonglin, Sun Jian, Jia Hao

School of Mining Engineering， Anhui University of Science & Technology， Huainan 232001， Anhui， China

Abstract: Objectives To ensure safe mining during gob-side entry driving in thick coal seams， this study investigates the optimal coal pillar width and the deformation and failure characteristics of the surrounding rock of gob-side entries.  Methods The 9106 working face of Linfen Tianyu Hengsheng Coal Industry， a subsidiary of Wanbei Coal and Electricity Group， was selected as the engineering case. Based on a theoretical analysis indicating a reasonable coal pillar width of 7.03~12.44 m for gob-side entry driving， FLAC3D was used to simulate the distributions of stress， displacement， and plastic zones in the surrounding rock when the coal pillar widths were 8， 9， and 10 m， respectively. Three monitoring schemes were designed for roadway surrounding rock displacement， roof fracture distribution， and coal pillar stress distribution. HCZ-2 borehole stress meters， borehole imaging， and DDWJ-2 multipoint displacement meters were used to monitor the distribution of lateral abutment pressure and the failure characteristics at different positions within the coal pillar during the mining of the working face when the narrow coal pillar width was 8 m. The deformation characteristics of the surrounding rock of the gob-side entry were also analyzed.  Results The results showed that the lateral abutment pressure generally increased and then decreased from the working-face side toward the goaf side. Obvious fractures and fractured zones occurred within the 0~2.5 m and 4.6~8.0 m ranges of the coal pillar， corresponding to the plastic failure zones， whereas the coal pillar exhibited good integrity within the 2.5~4.6 m range， corresponding to the elastic zone. The maximum deformation rates of the two roadway ribs at the two monitoring points were both greater than those of the roof and floor， and the displacement in the shallow surrounding rock was significantly greater than that in the deeper surrounding rock. Conclusions The optimized section coal pillar width of 8 m can ensure the safe mining of the 9106 working face.

Key words: gob-side entry; failure characteristics; coal pillar width; abutment pressure; plastic failure zone