摘要
针对突出煤层煤巷掘进突出危险性大、不易控制的难题,基于强化煤体结构及卸压增透瓦斯抽采时空协同机制,提出了穿层注浆加固与水力冲孔强弱耦合防突方法。从能量的角度分析了强弱耦合结构防治煤与瓦斯突出机理。借助数值模拟方法研究煤巷掘进时强弱耦合结构煤巷围岩应力响应及变形演化规律,得出强弱耦合措施能够实现应力集中纵深运移及减小煤巷变形的双重目的。进行现场试验发现,对比水力冲孔段,强弱耦合段煤巷围岩两帮变形量和顶板下沉量分别减小58.51%和61.42%;水力冲孔段煤巷两帮破碎程度大于强弱耦合段,且水力冲孔段和强弱耦合段煤巷两帮应力集中区分别在4m和5m左右;采取强弱耦合方案后,煤巷掘进速度提升了15.34%。穿层注浆加固与水力冲孔强弱耦合防突措施可以降低煤层瓦斯含量和压力,增强煤体强度,减少巷道变形,保障煤矿安全生产。
In view of high outburst risk and serious surrounding rock deformation during an excavation of outburst coal seam, a strong-weak coupling anti-outburst method of penetration grouting reinforcement and hydraulic flushing was proposed based on time-space coordination mechanism of strengthening coal and enhancing gas extraction. The anti-outburst mechanism of strong-weak coupling structure was analyzed from energy perspective. Stress response and deformation evolution of coal roadway surrounding rock with strong-weak coupling structure were studied through numerical simulation of coal roadway driving, revealing that strong-weak coupling scheme can realize dual purpose of migrating concentrated stress and reducing coal roadway deformation. The field test finds that compared with hydraulic flushing section, deformation of two sides of coal roadway and roof convergence in strong-weak coupling section decreases by 58.51% and 61.42%, respectively. Fracture degree of two sides in hydraulic flushing section is greater than that in strong-weak coupling section,and stress concentration areas in the two sections are about 4 m and 5 m, respectively. Excavating velocity increases by 15.34% after the application of strong-weak coupling structure. Penetration grouting reinforcement and hydraulic flushing strong-weak coupling anti-outburst measure can decrease gas content and pressure, reinforce coal body, small roadway deformation, and safe coal mine.
作者
郑仰峰
翟成
辛海会
唐伟
孙勇
徐吉钊
ZHENG Yangfeng;ZHAI Cheng;XIN Haihui;TANG Wei;SUN Yong;XU Jizhao(School of Safety Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;National Engineering Research Center for Coal Gas Control,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2021年第6期1269-1280,共12页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2020YFA0711800)
国家杰出青年科学基金项目(51925404)
国家自然科学基金项目(51774278)。
关键词
煤与瓦斯突出
煤巷掘进
强弱耦合模型
数值模拟
现场试验
coal and gas outburst
coal roadway excavation
strong-weak coupling model
numerical simulation
field test
