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弓长岭井下矿中央区开采急倾斜中厚矿体,随着采深的增大,采准工程出现地压显现的部位增多、规模逐渐增大,进入-280m中段开采后,采准工程的塌冒已经严重影响生产的正常进行。经过调查巷道发生破坏的部位与破坏区岩性变化,查明上盘楔形体围岩的附加力作用是引发回采巷道大规模破坏的主要原因,为此提出卸压开采方案,即在高应力区先回采上分段沿脉进路,为下分段卸掉垂直压力后,再掘进下分段沿脉进路。此外,根据巷道破坏过程与地压显现形式,分析了现用工字钢金属架支护方法的不适应性,提出根据岩性与地应力大小选择树脂锚杆、喷锚网联合支护的改进方案。初步试验表明,改进方案可有效解决上盘沿脉巷道的塌冒难题,并可较好地适应弓长岭井下矿深部矿岩条件,不失为弓矿实用技术。
In the central part of Gongchangling underground mine, the steeply inclined middle-thick ore body is exploited. With the increase of mining depth, the site of ground pressure appearing in the quasi-admitting engineering project increases and the scale gradually increases. After mining in the middle section of -280m, The collapse has seriously affected the normal production. After investigating the site of the damaged roadway and the lithology change of the damaged area, it is found that the additional force of the surrounding rock of the hanging wall wedge body is the main reason causing the large-scale destruction of the mining roadway. Therefore, a scheme of pressure relief mining is proposed, that is, The first mining on the sub-paragraph along the pulse of the road, for the next sub-section off the vertical pressure, and then sub-section along the pulse road. In addition, according to the process of roadway destruction and the appearance of ground pressure, the improper adaptability of existing support method of I-beam metal frame is analyzed. An improved scheme of selecting resin bolt and bolt-anchor combined support according to lithology and in-situ stress is proposed . The preliminary tests show that the improved scheme can effectively solve the problem of collapse of the roadway along the upper plate and can well adapt to the conditions of deep ore rock in the underground pit of Gongchangling, which is a practical technology for bowing.