采掘相向沿空掘巷动态分段围岩控制技术
Dynamic Sectional Control Technology for Surrounding Rock in Gob-side Entry Driving with Opposite Mining Direction
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摘要: 以付村煤矿3上411工作面运输巷掘进期间受3上408工作面采动动压影响为背景，对3上411运输巷迎3上408回采工作面掘进过程进行数值模拟分析。根据应力监测结果将动压影响巷道分为3段，并对其进行动态分段围岩控制：实体煤掘进段采用锚网索梁联合支护，锚索采用平行交错式三花布置方式；动压剧烈影响段在实体煤掘进段的基础上加大支护密度，为了增加锚杆的整体性和整体支护强度，顶板和两帮的锚杆采用φ14 mm钢筋梯连接，锚索采用平行五花式布置方式；采后稳定段受动压影响较小，为加快掘进速度采用锚网喷支护。现场监测表明，3上411运输巷顶底板和两帮位移均小于200 mm，有效地控制了采掘相向动压巷道的围岩变形。Abstract: Taking the transportation roadway of No.3 upper 411 mining face which influenced by the mining activity dynamic pressure of No.3 upper 408 as study background, the numerical simulation of gob-side entry driving process of No.3 upper 411 transportation roadway in the opposite direction of No.3 upper 408 mining face was carried out. According to the stress monitoring results, the dynamic pressure tunnel is divided into three sections, and the dynamic sectional surrounding rock control is carried out: in the solid coal excavation section, bolt + steel mesh + anchor + beam combined support was provided, anchor cabled with parallel staggered three flower arrangement; in the section of strongly influenced dynamic pressure, on the basis of the solid coal excavation section, the support density is increased. In order to increase the integrity and the overall strength of the bolt, and the bolts of roof and two sides are connected by steel ladder with the diameter of 14 mm, anchor cabled with parallel staggered five flower arrangement; the influence of the dynamic pressure on the stable section is small, so bolt mesh shotcrete support is used to speed up the driving speed. Field monitoring verifies that the deformation of the gateway roof and floor as well as two sides of No.3 upper 411transport roadway were all not more than 200 mm, which controls the deformation of the surrounding rock of the dynamic pressure roadway effectively.
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