Bibliographic Details
| Title: |
特厚煤层综放工作面过复杂构造区开采工艺优化与回撤通道联合支护技术. |
| Alternate Title: |
Surrounding rock stability and dynamic joint support technology for longwall panel through complex structural zones. |
| Authors: |
李杨1,2,3,4 liyangcumtb@163.com, 王楠1 wangnancumtb@163.com, 刘令生5, 张建6, 李海波6, 邹淩雲1, 王承乾1, 宋一飞1, 曹晋龙1 |
| Source: |
Coal Science & Technology (0253-2336). Feb2026, Vol. 54 Issue 2, p163-176. 14p. |
| Subject Terms: |
*Longwall mining, *Structural stability, *Structural geology, *Excavation (Civil engineering), *Coal mining safety, *Stress concentration |
| Geographic Terms: |
Inner Mongolia (China) |
| Abstract (English): |
During coal seam mining, complex geological structures such as faults, weathered zones, and folds often lead to hazards such as collapses and roof falls, threatening production safety and increasing roadway maintenance costs. To provide scientific guidance for the safe and efficient passage of longwall panels through such complex structural zones, this study takes the No. 6106 panel of the Hongshuli-ang Coal Mine in Inner Mongolia as its engineering background. Facing severe coal-rock weathering, difficulty in panel advancement, and instability of surrounding rock, a systematic investigation was carried out. A mining sequence of "inclination adjustment-roadway expos-ure-support withdrawal-panel narrowing" was established and optimized for crossing structural zones, and its key parameters were quantit-atively analyzed based on mechanical stability criteria. The results reveal the dynamic migration of stress concentration in the stope and the deformation characteristics of surrounding rock during the roadway exposure and support withdrawal process, and clarify the distribution law of supporting stress within the gradient coal pillar. As the panel advances, the stope stress concentration gradually shifts from the middle of the face to the structural-zone coal pillar; the surrounding rock stress concentration zone migrates from the panel side toward the structural-zone side, showing a spatial transfer trend from the lower left to the upper right. Surrounding rock stability varies significantly across advancement stages: when approaching the withdrawal roadway, stress and deformation increase markedly, roof subsidence be-comes pronounced, and load-bearing capacity declines sharply, requiring targeted reinforcement. Based on the mechanical response char-acteristics of surrounding rock at each stage, a stage-specific dynamic joint support system was proposed using a "bolt-mesh-cable" sup-port mode in the early exposure phase, followed by the sequential implementation of "single beam with three props single beam with four props localized reinforcement support" as the face advances. Field application and monitoring results demonstrate that the proposed support scheme effectively controls surrounding rock deformation, improves roadway stability, reduces maintenance costs, and mitigates failure risks, providing reliable theoretical and technical support for the safe and efficient extraction of ultra-thick coal seam longwall pan-els through complex structural zones. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
在煤层开采过程中, 断层、风化带和褶皱等复杂地质构造区常导致塌陷和冒顶等灾害, 威胁 采场安全并增加巷道维护成本。为科学指导工作面安全高效通过复杂构造区, 以内蒙古红树梁煤矿 6106 工作面为工程背景, 针对采面内遇复杂构造区煤岩风化严重, 工作面无法正常推进、围岩难以控制等难题展开了系统的研究。构建并优化了一种"调斜—揭露-支架回撤-缩面"的过构造区开采工艺路径, 并基于力学稳定性判据对其关键参数进行了定量分析。研究揭示了在工作面揭露回撤通道过程中采场应力集中的动态迁移规律以及巷道围岩的变形特性, 并系统分析了渐变煤柱内支承应力分布特征, 结果表明: 随工作面的推进, 采场应力集中由工作面中部向构造区煤柱逐步迁移; 巷道围岩应力集中区域由工作面側 (左下角方向) 向构造区侧 (右上角方向) 迁移, 并呈现沿该方位的空间转移趋势; 巷道围岩的稳定性在不同推进阶段存在显著差异, 随着工作面逐渐接近回撤通道, 围岩应力和变形增大, 顶板下沉明显, 围岩承载能力显著下降, 需针对性强化支护措施。基于巷道围岩在各阶段的力学响应特性, 针对性地提出了工作面揭露回撤通道前期采用"锚一网—索"支护模式, 并随工作面推进逐步实施"一梁三柱→一梁四柱→局部补强支护"的动态联合支护技术。现场应用和监测结果显示, 该支护方案有效控制了围岩变形, 提升了巷道稳定性, 降低了维护成本及破坏风险, 为特厚煤层综放工作面穿越复杂构造区的安全高效开采提供了可靠的理论支撑与技术指导。 [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
