煤炭技术

为提升开采效率并避免传统充填方式的应力集中问题，探索切顶卸压无煤柱自成巷技术在中厚煤层中的应用。以晋华宫矿8501工作面为例，通过理论分析、数值模拟与现场监测，制定“补、切、护、支”沿空留巷方案。重点模拟不同切顶高度与角度下的围岩应力与顶板位移，结果显示，优化后的切顶参数能促进顶板垮落填充采空区，阻断应力传导，优化巷道应力环境，保障巷道稳定，为中厚煤层开采提供科学依据。

In order to improve the mining efficiency and avoid the stress concentration problem of the traditional filling method, explore the application of cutting top and relieve pressure no pillars self-forming technology in medium-thick coal seams. Taking 8501 working face in Jinhuagong mine as an example, the "filling, cutting, protecting and supporting" scheme is formulated through theoretical analysis, numerical simulation and on-site monitoring of the gob-side entry rataining. The focuses on simulating the surrounding rock stress and roof displacement under different heights and angles of roof cutting, and the results show that the optimized roof cutting parameters can promote the roof collapse to fill the hollow area, block stress conduction, optimize the stress environment of the roadway, and ensure the stability of the roadway, which provides a scientific basis for the mining of medium-thickness coal seams.