Bofang Coal Mine Branch Company, Shanxi Lanhua Sci-tech Venture Co., Ltd.

伯方煤矿深部煤炭资源开采后,原有应力状态被破坏,导致工作面前方支承应力增大,工作面前方巷道发生明显的变形,严重影响了煤矿安全生产。为此,基于聚能爆破切顶卸压理论对巷道围岩控制进行了数值模拟和应用实践研究,采用“工作面超前切顶”(RCAWC)技术,通过主动降低应力来减弱变形,阐述了RCAWC对采动应力的抵消机制,分析了不同RCAWC高度的承载应力演化规律。随着RCAWC高度的增加,桥台应力显著降低,但随着厚顶板的切断,负相关效应减弱。结果表明,采用RCAWC技术后,巷道变形减小63.6%~75%,保护煤柱尺寸减小约1/3,RCAWC技术在阻止采动应力向巷道传播、减小支承应力程度、最终缓解围岩应力和变形方面具有显著作用。

After the deep mining of coal resources in Bofang Coal Mine, the original stress state is destroyed, resulting in increased support stress in front of the working face and occuring obvious deformation of the roadway in front of the working face, seriously affecting the safety production of the coal mine. To this end, numerical simulation and application practical research are conducted on the control of roadway surrounding rock based on the theory of energy gathering blasting roof cutting and pressure relief. The "working face advanced roof cutting" (RCAWC) technology is adopted to reduce deformation by actively reducing stress. The mechanism of RCAWC to counteract mining stress is expounded, and the evolution law of bearing stress at different heights of RCAWC is analyzed. As the height of the RCAWC increases, the stress on the bridge abutment significantly decreases, but the negative correlation effect weakens with the cutting of the thick roof. The results show that after adopting RCAWC technology, the deformation of the roadway is reduced by 63.6%-75%, and the size of the protective coal pillar is reduced by about 1/3. RCAWC technology has a significant effect on aspects of preventing the propagation of mining stress to the roadway, reducing the degree of supporting stress, and ultimately relieving the stress and deformation of the surrounding rock.