本文選題：地表移動變形規(guī)律　切入點：地表觀測　出處：《西安科技大學(xué)》2017年碩士論文

【摘要】：麟游礦區(qū)是陜西繼彬長礦區(qū)后又一個開發(fā)的大型煤炭基地,該礦區(qū)地表為殘塬溝壑梁峁相間地貌,煤層埋藏深、開采厚度大,且覆巖中存在厚硬巖層,其對地表移動變形起著控制作用,當該礦區(qū)進行大范圍綜放開采時,覆巖結(jié)構(gòu)將發(fā)生破壞,可能誘發(fā)強礦壓和地表溝壑區(qū)滑坡災(zāi)害的發(fā)生。因此,開展麟游礦區(qū)綜放開采地表移動變形規(guī)律研究,對麟游礦區(qū)實現(xiàn)安全、綠色、高效開發(fā)具有重要意義。論文以麟游礦區(qū)郭家河煤礦3#煤層I盤區(qū)開采為研究對象,通過分析1303和1305工作面開采地表移動變形觀測數(shù)據(jù)可知:單一工作面開采結(jié)束后,地表下沉量較小,下沉系數(shù)η為0.140,但局部溝壑區(qū)域地表下沉量較大;兩個工作面開采結(jié)束后,下沉系數(shù)η也僅為0.254。針對這一現(xiàn)象,應(yīng)用物理相似材料模擬和數(shù)值模擬對郭家河煤礦綜放開采覆巖運移規(guī)律展開研究,研究表明:(1)郭家河煤礦覆巖中存在高位厚硬巖層,其為研究區(qū)域的關(guān)鍵層;(2)區(qū)段煤柱對覆巖起到一定的支撐作用,當兩個工作面開采結(jié)束后,上覆巖層在區(qū)段煤柱的作用下形成連續(xù)垮落拱,拱形結(jié)構(gòu)對覆巖運移起到了重要控制作用;(3)關(guān)鍵層為高位厚硬巖層,覆巖破壞未波及至關(guān)鍵層,關(guān)鍵層位于彎曲下沉帶,抑制了地表的下沉量;(4)揭示了在接近充分采動條件下,下沉系數(shù)較小的原因;(5)應(yīng)用計算機反演模擬及對溝壑區(qū)坡體自身穩(wěn)定性進行綜合分析,給出了局部溝壑區(qū)域地表下沉系數(shù)增加的原因:由于坡體自身穩(wěn)定差,在采動影響下將產(chǎn)生一定的滑移量,導(dǎo)致下沉系數(shù)略大。研究成果不僅為麟游礦區(qū)綜放開采地表移動變形規(guī)律研究提供了科學(xué)依據(jù),也對該礦區(qū)地面建筑物保護、預(yù)防地表溝壑區(qū)滑坡災(zāi)害的發(fā)生及井下強礦壓的防治等具有一定的指導(dǎo)價值。
[Abstract]:Linyou mining area is another large coal base developed after Binchang mining area in Shaanxi Province. The surface of the mining area is composed of gully ridge and knoll landforms. The coal seam is buried deep, the mining thickness is large, and there are thick hard strata in the overburden rock.It plays an important role in controlling the surface movement and deformation. When a large area of fully mechanized caving mining is carried out in this mining area, the overburden structure will be destroyed, which may induce the occurrence of strong mine pressure and landslide disaster in the gully area.Therefore, it is of great significance for Linyou mining area to carry out research on the law of surface movement and deformation of fully mechanized caving mining in Linyou mining area.This paper takes the coal seam I area mining of Guojiahe coal mine in Linyou mining area as the research object. By analyzing the observation data of surface movement and deformation of mining face 1303 and 1305, it can be seen that after the mining of a single working face is finished, the amount of surface subsidence is relatively small.The subsidence coefficient 畏 is 0.140, but the surface subsidence is larger in the local gully area, and the subsidence coefficient 畏 is only 0.254 after the mining of the two faces.In view of this phenomenon, the overburden migration law of Guojiahe coal mine is studied by using physical similar material simulation and numerical simulation. The study shows that there are high thick hard strata in overburden rock of Guojiahe coal mine.The coal pillar of the section is the key layer in the study area. The coal pillar plays a supporting role to the overburden rock. When the mining of the two working faces is finished, the overlying strata will form a continuous caving arch under the action of the section pillar.The arch structure plays an important role in controlling the overburden rock migration. The key layer is high thick hard rock layer. The overburden failure does not spread to the key layer, and the key layer is located in the bending subsidence zone, which inhibits the subsidence of the surface.By using computer inversion simulation and comprehensive analysis of slope body stability in the gully region, the reasons for the increase of surface subsidence coefficient in local gully region are given: because of the poor stability of slope body itself.Under the influence of mining, a certain amount of slip will be produced and the subsidence coefficient will be slightly larger.The research results not only provide a scientific basis for the study of the law of surface movement and deformation of fully mechanized caving mining in Linyou mining area, but also protect the ground buildings in the mining area.It has certain guiding value to prevent the occurrence of landslide disaster and the prevention of underground strong rock pressure in the gully area.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD325

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