毕节市煤矿回采巷道锚网支护研究

发布时间：2018-03-05 06:42

本文选题：回采巷道　切入点：支护方案　出处：《湖南科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：毕节市主要含煤地层为上二叠统龙潭组,绝大多数煤矿煤层直接顶板和直接底板均有较薄的泥岩,老顶和老底以粉砂岩居多,地质条件与黔西县泰来乡境内的A矿相似。本文以毕节市近年来顶板事故频发为背景,以黔西县泰来乡境内的A矿井下回采巷道支护改革取得的成功经验为依托,在充分分析A矿支护改革前后对比、现有锚网支护的基础上提出了锚网支护优于棚式支护,根据现场顶板离层监测数据等资料分析了A矿所采用的支护方案较为合理,在此基础上,利用FLAC3D计算机软件对原锚网支护方案进行了数值模拟,并进行了围岩应力和巷道位移量的分析,通过调整锚杆间排距、数量及长度,得出最优的锚网支护方案。根据A矿井下回采巷道支护改革的工程实践表明,采用锚网支护,明显优于棚式支护。在顶板管理方面,每年节约60万元的巷道维护费;在巷道掘进速度方面,每年多掘进巷道工程量约500m;在安全方面,采用锚网支护后,有效地控制了巷道的变形,掘进和回采期间未发生过冒顶和片帮事故。根据A矿回采巷道顶板离层等方面的数据分析,分析煤矿所采用的支护参数较为合理,能有效控制巷道变形,有效遏制巷道冒顶、片帮事故的发生。采用FLAC3D计算机软件对A矿1903运输巷锚杆支护方案进行数值模拟,得出原支护方案巷道变形量均在安全范畴。通过调整锚杆间排距、长度及数量,利用FLAC3D软件数值模拟分析,得出最佳的巷道支护方案。优化后巷道在顶板、左帮和右帮等方面的支护效果显著。毕节市作为主要产煤市,近年来煤矿企业在毕节工业强市中发挥着重要的作用,但据统计,毕节市范围内仅有1/3的煤矿在回采巷道采用了锚网支护。实践证明,支护效果均较好,实施锚网支护后的煤矿近年来顶板事故基本为零。为有效遏制煤巷顶板事故及片帮事故的发生,确保职工生命财产安全,实现毕节市煤矿高产、高效、健康发展,在煤矿井下回采巷道推广使用锚网支护是必要的。
[Abstract]:The main coal-bearing strata in Bijie city are the Upper Permian Longtan formation. Most coal seams have thin mudstone on the direct roof and the direct floor, and siltstone is the majority of the main roof and bottom. The geological conditions are similar to mine A in Tailai Township, Qianxi County. This paper is based on the frequent roof accidents in recent years in Bijie City and on the successful experience of the underground mining roadway support reform in A Mine in Tailai Township, Qianxi County. On the basis of fully analyzing the contrast before and after the reform of A mine support, the paper puts forward that the bolting net support is superior to the shed type support, and according to the monitoring data of the roof separation layer, the supporting scheme adopted in A mine is more reasonable. On this basis, the original bolt-mesh support scheme is numerically simulated by using FLAC3D computer software, and the surrounding rock stress and roadway displacement are analyzed. According to the engineering practice of mining roadway support reform under mine A, the bolting net support is obviously superior to shed type support. In roof management, 600,000 yuan of roadway maintenance fee is saved every year. In the aspect of roadway driving speed, the amount of roadway engineering is about 500m per year. In safety, the deformation of roadway is effectively controlled by bolting and mesh support. There has been no roof fall or roof accident during excavation and mining. According to the data analysis of roof separation of roadway in A mine, the supporting parameters used in coal mine are reasonable, which can effectively control the deformation of roadway and control the roof fall of roadway. Numerical simulation of bolt support scheme in 1903 transport roadway of A mine is carried out by using FLAC3D software. It is concluded that the deformation of the original support scheme is in the safe category. By adjusting the spacing, length and quantity of bolt, the roadway deformation of the original support scheme is in the safe category. By using the numerical simulation analysis of FLAC3D software, the best roadway support scheme is obtained. The support effect of the optimized roadway is remarkable in the aspects of roof, left side and right side, etc. Bijie City is the main coal producing city. In recent years, coal mining enterprises have played an important role in Bijie industrial strong city, but according to statistics, only 1/3 coal mines in Bijie city have adopted bolt-mesh support in mining roadway. The roof accidents of coal mine after bolting and mesh supporting are basically zero in recent years. In order to effectively curb the occurrence of roof accidents and side accidents in coal roadways, ensure the safety of workers' lives and property, and realize the high yield, high efficiency and healthy development of coal mines in Bijie City, It is necessary to popularize the use of bolting and mesh support in underground mining roadways.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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