摘要
针对综采工作面侧向支承压力引起动压巷道围岩大变形的现象,以潞安矿区五阳煤矿综采工作面运输巷为工程背景,通过现场调研、地质力学参数测试、理论分析、数值模拟、工业性试验等多种手段,提出了基于强力支护和水力压裂卸压的动压巷道“支卸”双效围岩控制技术。采用数值模拟软件分析了基本顶水力压裂卸压对采空区悬顶结构和动压巷道围岩应力分布的影响。模拟结果显示,水力压裂切顶可以减小顶板悬臂长度、降低综采工作面侧向支承压力的影响范围和程度。在顶板水力压裂卸压机理基础上,进一步研究了动压巷道强力支护作用机理,通过将水力压裂技术和强力锚杆锚索支护技术进行有机结合,提出了针对动压巷道的“支卸”双效围岩控制理论和支护设计原则。在五阳煤矿7609运输巷对“支卸”双效围岩控制理论开展了工业试验,现场实测数据显示,压裂段巷道顶底板位移量和两帮位移量比非压裂段分别减小53%和71%。“支卸”组合工程技术措施在提高支护系统强度和刚度的同时,降低了巷道围岩压力,可有效控制动压巷道的围岩变形。
In view of large-scale deformation of the surrounding rocks in dynamic-pressure roadways caused by the lateral abutment pressure in the working face,taking the transportation roadway of a certain working face in the Lu’an Mining Area as the engineering background,through various means such as on-site investigation,geomechanical parameter testing,theoretical analysis,numerical simulation,and industrial tests,a“support-relief”dual strata control technology for dynamic-pressure roadways based on strong supporting and hydraulic fracturing pressure relief is proposed.The numerical simulation software is used to analyze the influence of the hydraulic fracturing pressure relief of the main roof on the suspended-roof in the goaf and the stress distribution of the surrounding rock in the dynamic-pressure roadway.The simulation results show that the roof cutting by hydraulic fracturing can reduce the overhanging length of the roof and decrease the influence range and degree of the lateral abutment pressure in the working face.Based on the mechanism of the hydraulic fracturing pressure relief of the roof,the action mechanism of the strong supporting in the dynamic-pressure roadway is further studied.By organically combining the hydraulic fracturing technology and the strong bolt-cable support technology,the“support-relief”dual strata control theory and the support design principles for dynamic-pressure roadways are proposed.An industrial test of the theory is carried out in the Wuyang coal mine 7609 transportation roadway.The on-site measured data show that the roof-floor displacement and the two-side displacement of the roadway in the fracturing section are reduced by 53%and 71%respectively compared with those in the non-fracturing section.The“support-relief”combined engineering technical measures can reduce the surrounding-rock pressure of the roadway while improving the strength and stiffness of the support system,and can effectively control the deformation of the surround rocks in dynamic-pressure roadways.
作者
覃杰
方树林
QIN Jie;FANG Shulin(China Coal Research Institute,Chaoyang,Beijing 100013,China;Tiandi Science and Technology Co,Ltd.,Chaoyang,Beijing 100013,China;CCTEG Coal Mining Research Institute Co.,Ltd.,Chaoyang,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization,Chaoyang,Beijing 100013,China)
出处
《中国煤炭》
北大核心
2025年第8期35-46,共12页
China Coal
基金
国家自然科学基金面上项目(51874175)。
关键词
动压巷道
水力压裂
侧向支承压力
顶板悬臂长度
强力支护
dynamic-pressure roadway
hydraulic fracturing
lateral abutment pressure
overhanging length of the roof
strong supporting
作者简介
覃杰(1986-),男,湖南常德人,硕士,高级工程师,主要从事煤矿工程设计和数字矿山的技术开发工作。E-mail:nyxydotcom@126.com。
