切顶条件下综放沿空留巷充填体承载特征及合理宽度研究被引量：15

Study on the bearing characteristics and reasonable width of the backfilling body for gob-side entry in fully-mechanized top-coal caving face under the roof cutting condition

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摘要超前工作面致裂顶板卸压配合巷旁充填的留巷方式,是解决综放工作面留巷难的有效途径之一,而巷旁充填体参数合理化设计是该留巷方式成功的关键。构建切顶高度范围内采空区等效承载本构关系,推导切顶条件下综放沿空留巷充填体支护阻力表达式,结合赵家寨矿12209工作面沿空留巷的工程地质条件,计算充填体合理宽度和变形量范围。基于对切顶高度范围内采空区承载本构关系的数值反演,揭示充填体承载特征并确定充填体合理宽度值。研究结果表明:采空区断裂岩层与矸石经历由接触到逐渐压实的过程中,采空区压缩位移不断增大,充填体支护作用不断减小;理论计算得到充填体最小宽度为1.95 m;随着工作面推进,充填体承载力呈先急剧增长、再快速增长、最后稳定3个阶段变化,并与采空区矸石承载特征保持协调关系;确定赵家寨矿12209综放工作面充填体合理宽度为2.2 m,工程实践表明,巷道围岩稳定性较好,实现了对该类巷道围岩稳定性控制。 Roadway retaining technology of roadside backfilling combined with roof cutting working face in advance is one of the effective ways to solve the difficulty of retaining roadway in fully-mechanizedcoal mining with top-coal caving,and the rational design of roadside backfilling body’sparameters is the key to the success of this roadway retaining method. The whole equivalent bearing constitutiverelation of goaf in cutting roof height is established in this paper. Based on this constitutive relation,the support resistance of the backfilling body is deduced. Combined with the 12209 longwall engineergeological conditions of Zhaojiazhai colliery,the reasonable width and deformation range of thebackfilling body are calculated. Based on the numerical inversion of the goaf’s bearing constitutive relationshipwithin the range of top cutting height,the bearing characteristics of the backfilling body are revealedand the reasonable width is determined. The research shows that the compression displacement increasesin the goaf and the support action of the backfilling body decreases in the dynamic process fromcontact to gradual compaction between the upper fault strata and the collapsed gangue in the goaf. Thetheoretical calculation shows that the minimum width of the backfilling body is 1. 95 m. With theadvance of the working face,the bearing capacity of the backfilling body increases sharply at first,thenincreases rapidly,and finally stabilizes in three stages,and maintains a coordinated relationship with thebearing characteristics of gangue in the goaf. The optimal width of the backfilling body is determined tobe 2. 2 m in the 12209 fully-mechanized caving face of Zhaojiazhai colliery. The engineering practiceshows that the surrounding rock stability of gob-side entry retaining performs well,and the aim of surrounding rock stability control is realized for this kind of roadway.

作者冯超刘少伟张小东张英姜彦军李永恩 FENG Chao;LIU Shaowei;ZHANG Xiaodong;ZHANG Ying;JIANG Yanjun;LI Yong’en(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;School of Architecture and Civil Engineering,Anyang Institute of Technology,Anyang,Henan 455000,China;State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization,Jiaozuo,Henan 454000,China;Zhongyun International Engineering Co Ltd,Zhengzhou,Henan 450007,China;Xinzheng Coal Electricity Zhengzhou Coal Industry Group,Zhengzhou,Henan 451184,China;Department of Coal Management,Shenhua Guoneng Group Co Ltd,Beijing 100033,China)