高瓦斯工作面沿空留巷围岩控制机理及其工程应用
Control Mechanism of Surrounding Rock of Gob-side Entry in a Highly Gassy Working Face and Its Application
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摘要: 针对“U”型通风方式下存在的上隅角及回采巷道瓦斯超限问题,以典型高瓦斯工作面为工程背景,综合理论分析、室内实验、数值模拟、现场实测等方法开展“Y”型通风技术与沿空留巷围岩控制研究。结果表明:基于采空区上覆岩层结构及其运动特征,确定由高预应力锚杆(索),早强、快速增阻、可缩性的充填墙体及高强巷旁支护组成的沿空留巷围岩控制技术;结合矿方具体条件确定充填墙体构筑材料并进行力学特性试验,通过不同墙体宽度下围岩应力位移场分布特征确定合理墙体宽度;提出了沿空留巷支护方案和具体参数,并进行现场工程应用。现场矿压观测结果证明了沿空留巷围岩控制方案的合理性。Abstract: Aiming at the problems of gas transfinite in upper corner and mining entry at highly gassy working face with “U” type layout, a comprehensive method including theory analysis, laboratory test, numerical modeling and field test was implemented. The control mechanism of gob-side entry and Y type ventilation system was tested based on the background of Qiuji Coal Mine. The research results indicated that: based on the movement characteristics of strata in goaf, a comprehensive control measure including high pre-stress bolt/cable, early strength and high resistance and compressive filling body and high resistance support was proposed; based on the specific geological conditions, the component materials of filling body and its mechanical mechanism were determined, a rational width of filling body was deduced by numerical simulation; a support scheme was proposed and applied to the engineering practice. The validity of the control scheme was validated by the field monitoring.
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