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），doi:10.16186/j.cnki.1673-9787.2024040051

SHANG S, YU Z L, SUN J，et al. Width optimization and deformation failure characteristics of narrow coal pillar in gob-side entry d riving in thick coal seam［J］.Journal of Henan Polytechnic University（Natural Science），doi:10.16186/j.cnki.1673-9787.2024040051

厚煤层沿空掘巷窄煤柱宽度优化及其变形破坏特征(网络首发)

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] 为了研究厚煤层沿空掘巷合理煤柱宽度及优化后沿空巷道围岩变形破坏特征，[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模拟分析了煤柱宽度分别为8，9，10 m时沿空掘巷围岩应力、位移及塑性区分布特征，确定了9106工作面沿空掘巷合理煤柱留设宽为8 m，同时还模拟分析了8 m煤柱在支护条件下围岩的应力、位移和塑性区分布特征，验证了8 m煤柱在支护方案下的可行性。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三种方案，利用HCZ-2型钻孔应力计、钻孔窥视和DDWJ-2型多点位移计等仪器，监测了煤柱宽度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，分析了沿空掘巷围岩位移变化规律。[结果] 结果表明：侧向支承压力从工作面侧至采空区侧整体呈现由小增大再减小的分布规律；煤柱宽度在0~2.5 m和4.6~8 m时，出现较为明显破碎裂隙和破碎带，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；AA′和BB′两个监测点的巷道两帮最大变形速率均大于顶底板变形速率，且沿空巷道浅部位移量明显大于深部位移量。[结论] 优化的区段煤柱宽度（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

中图分类号：TD353

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

网络首发日期：2025-03-26

Width optimization and deformation failure characteristics of narrow coal pillar in gob-side entry d riving in thick coal seam

SHANG Shuai, YU Zhonglin, SUN Jian,JIA Hao

(School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China)

Abstract: [Objective] To study the reasonable coal pillar width of gob-side entry driving in thick coal seam and the deformation and failure characteristics of surrounding rock of gob-side entry driving after optimization, [Methods] the 9106 working face of Linfen Tianyu Hengsheng Coal Industry of Wanbei Coal and Electricity Group was taken as the engineering background. Based on the theoretical analysis of the reasonable width of coal pillar in gob-side entry driving ranging from 7.03 m to 12.44 m, FLAC3D was used to simulate and analyze the distribution characteristics of stress displacement and plastic zone of surrounding rock of gob-side entry driving when the width of coal pillar was 8 m, 9 m, and 10 m respectively. The reasonable coal pillar width of gob-side entry driving in the 9106 working face was determined to be 8 m. At the same time, the distribution characteristics of stress displacement and plastic zone of surrounding rock of 8 m coal pillar under supporting conditions were simulated and analyzed, and the feasibility of 8 m coal pillar under a supporting scheme was verified. Three schemes of roadway surrounding rock displacement monitoring, roof fracture distribution detection and coal pillar stress distribution monitoring were designed. HCZ-2 borehole stress meter, borehole peeping and DDWJ-2 multi-point displacement meter were used to monitor the distribution law of lateral abutment pressure and the failure characteristics of different positions of coal pillar in the mining process of working face when the width of the coal pillar was 8 m. The displacement variation law of surrounding rock in gob-side entry driving was analyzed. [Results] The results showed that the lateral abutment pressure exhibited a distribution pattern that increased from the working face side to the goaf side and then decreased. In the range of 0 ~ 2.5 m and 4.6 ~ 8 m, there were obvious broken fissures and broken zones in the coal pillar, which was the plastic failure zone of the coal pillar. The coal pillar was in the range of 2.5 ~ 4.6 m, and the integrity was good. This range was the elastic zone of the coal pillar. The maximum deformation rate of the two sides of the roadway at the two monitoring points of AA ' and BB ' was greater than the deformation rate of the roof and floor, and the displacement of the shallow part of the gob-side entry was significantly greater than the deep displacement. [Conclusion] The optimized section coal pillar width ( 8 m ) could realize the safe mining of 9106 working face.

Key words: Gob-side roadway; characteristics of destruction; coal pillar width; supporting pressure; plastic failure zone

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