本文關鍵詞： 動壓巷道 錨桿支護 圍巖穩(wěn)定性 大變形　出處：《安徽理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：煤炭是我國的主要能源,隨著煤炭的不斷開采,開采深度不斷增加,煤巷支護技術就越發(fā)顯得重要。本課題以黃陵二號煤礦409輔助運輸巷和407回風巷開展的典型動壓巷道具體成果為基礎,形成針對黃陵二礦采動巷道的合理支護技術體系。黃陵二號煤礦工作面采用“一面三巷”的巷道布置方式,分別為膠帶巷、回風巷和輔助運輸巷,其中輔助運輸巷與膠帶巷之間以30m煤柱相隔,輔助運輸巷在本工作面回采結束后,還將作為鄰近的下一工作面回風巷繼續(xù)使用。由于受到多次采動影響,輔助運輸巷在二次復用期間(即作為下一工作面回風巷時)將發(fā)生劇烈變形,尤其是煤幫與底板的變形量最大將超過1000mm,導致巷道斷面急劇收縮,嚴重地影響了工作面的安全高效生產。 目前黃陵礦區(qū)整體支護技術處于普通高強度錨桿支護階段,高強錨桿支護技術對于普通煤巷支護具有一定的適應性,但難以實現(xiàn)大跨度、大斷面、強采動條件下巷道的有效維護。論文針對409輔助運輸巷,強化頂部厚煤層頂板的控制,強化幫部圍巖控制,強化煤柱幫的完整性控制和承載性能。頂板及兩幫采用高強預應力錨帶網(wǎng)索支護,底板用快硬水泥進行加固。409工作面回采結束后,根據(jù)輔助運輸巷的維護狀況和礦壓觀測結果,針對局部大變形區(qū)域進行適當擴刷和二次加固。論文結合407回風巷,采用綜掘機割底,將巷道刷至設計高度。再對巷道圍巖表面進行處理,局部出現(xiàn)巖塊兜網(wǎng)的情況,可將其放掉,再根據(jù)具體情況在該位置補打錨桿索,片幫處應及時補打錨桿。對于已經(jīng)松弛、破斷等失效錨桿,在原位置附近補打單體錨桿或單體錨索。 經(jīng)過計算機數(shù)值模擬分析及實際礦壓觀測,表明支護能夠滿足掘進與回采期間的對巷道變形控制要求,保證了巷道的穩(wěn)定性及正常使用,為工作面的安全高效回采提供了必備條件。
[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.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD353

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