动压巷道大变形控制与支护技术研究

发布时间：2018-03-01 23:30

本文关键词： 动压巷道锚杆支护围岩稳定性大变形　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：煤炭是我国的主要能源,随着煤炭的不断开采,开采深度不断增加,煤巷支护技术就越发显得重要。本课题以黄陵二号煤矿409辅助运输巷和407回风巷开展的典型动压巷道具体成果为基础,形成针对黄陵二矿采动巷道的合理支护技术体系。黄陵二号煤矿工作面采用“一面三巷”的巷道布置方式,分别为胶带巷、回风巷和辅助运输巷,其中辅助运输巷与胶带巷之间以30m煤柱相隔,辅助运输巷在本工作面回采结束后,还将作为邻近的下一工作面回风巷继续使用。由于受到多次采动影响,辅助运输巷在二次复用期间(即作为下一工作面回风巷时)将发生剧烈变形,尤其是煤帮与底板的变形量最大将超过1000mm,导致巷道断面急剧收缩,严重地影响了工作面的安全高效生产。目前黄陵矿区整体支护技术处于普通高强度锚杆支护阶段,高强锚杆支护技术对于普通煤巷支护具有一定的适应性,但难以实现大跨度、大断面、强采动条件下巷道的有效维护。论文针对409辅助运输巷,强化顶部厚煤层顶板的控制,强化帮部围岩控制,强化煤柱帮的完整性控制和承载性能。顶板及两帮采用高强预应力锚带网索支护,底板用快硬水泥进行加固。409工作面回采结束后,根据辅助运输巷的维护状况和矿压观测结果,针对局部大变形区域进行适当扩刷和二次加固。论文结合407回风巷,采用综掘机割底,将巷道刷至设计高度。再对巷道围岩表面进行处理,局部出现岩块兜网的情况,可将其放掉,再根据具体情况在该位置补打锚杆索,片帮处应及时补打锚杆。对于已经松弛、破断等失效锚杆,在原位置附近补打单体锚杆或单体锚索。经过计算机数值模拟分析及实际矿压观测,表明支护能够满足掘进与回采期间的对巷道变形控制要求,保证了巷道的稳定性及正常使用,为工作面的安全高效回采提供了必备条件。
[Abstract]:Coal is the main source of energy in our country. With the continuous exploitation of coal, the mining depth is increasing. The technology of coal roadway support is becoming more and more important. This subject is based on the concrete achievements of the typical dynamic pressure roadway developed by 409 auxiliary transport lane and 407 return air roadway in Huangling No. 2 Coal Mine. To form a reasonable supporting technology system for mining roadway in Huangling No.2 Coal Mine. Huangling No. 2 coal face adopts "one side and three roadways" roadway layout mode, which are belt roadway, return air roadway and auxiliary transportation roadway, respectively. The auxiliary transport roadway is separated by 30m coal pillar between the belt roadway and the auxiliary transport roadway. After the mining of this working face is finished, the auxiliary transport roadway will continue to be used as the return air roadway of the next adjacent working face. The auxiliary transportation roadway will undergo severe deformation during the second reuse period (that is, as the next working face return air lane), especially the maximum deformation of coal side and floor will exceed 1000mm, which will lead to the sharp contraction of roadway section. Seriously affected the face of the safety and efficiency of production. At present, the whole support technology of Huangling mining area is in the stage of ordinary high strength bolt support. The high strength bolt support technology has certain adaptability to the ordinary coal roadway support, but it is difficult to realize the large span and large section. The effective maintenance of roadway under strong mining conditions. Aiming at 409 auxiliary transportation roadway, this paper strengthens the control of roof of thick coal seam at the top and surrounding rock control of side wall. Strengthening the integrity control and bearing capacity of coal pillar side. The roof and two sides are supported by high strength prestressed anchor with mesh and cable, and the bottom plate is strengthened with quick hard cement after mining, according to the maintenance condition of auxiliary transportation roadway and the result of observation of mine pressure, This paper combines 407 return air roadway, adopts fully-mechanized excavator to cut the bottom of roadway, brushes the roadway to the design height, and then treats the surrounding rock surface of the roadway, and the local situation of rock block draining net appears. It can be released, and then in accordance with the specific situation in the position to fill the anchor cable, the patch should be in time to make up the anchor bolt. For the already relaxed, broken and other failure of the anchor, in the original position in the vicinity of the repair of the single anchor or single anchor cable. Through computer numerical simulation analysis and actual mine pressure observation, it is shown that the support can meet the requirements of roadway deformation control during tunneling and mining, and ensure the stability and normal use of roadway. It provides necessary conditions for safe and efficient mining.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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