本文選題：綜放工作面 + 支承壓力　； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：龍王溝煤礦位于內(nèi)蒙古自治區(qū)準(zhǔn)格爾煤田中北部,地處鄂爾多斯市準(zhǔn)格爾旗薛家灣鎮(zhèn)境內(nèi),為在建礦井。主采煤層為6號(hào)煤層,傾角為0°~5°,平均埋藏深度354m,可采厚度4.00m~30.10m,平均20m,煤類單一,矸石夾層為0~32,巖性以泥巖為主。頂板主要含砂質(zhì)泥巖及粉砂巖,底板以砂質(zhì)泥巖與泥巖為主。本文以龍王溝煤礦地質(zhì)條件為背景,首先根據(jù)煤層埋深、煤體強(qiáng)度及厚度、節(jié)理裂隙、頂板條件、采放比和放煤口尺寸位置,分析得出6號(hào)煤層頂煤冒放性一般;其次運(yùn)用物理相似材料模擬實(shí)驗(yàn)手段研究得出初采期直接頂隨采隨落,老頂周期來壓步距14m~37m(平均23m),隨著推進(jìn),工作面上位巖層出現(xiàn)“懸臂梁”產(chǎn)生、折斷和“砌體梁”形成、失穩(wěn),及兩種結(jié)構(gòu)交替的現(xiàn)象,這是造成綜放面周期來壓的原因,同時(shí)工作面超前支承壓力增大,峰值在9.2MPa~11.7MPa之間。又通過數(shù)值模擬及理論計(jì)算認(rèn)為,工作面煤壁上方頂板為剪切與拉伸的復(fù)合型破壞,采空區(qū)上方頂板則是拉伸為主的破壞形式,支架工作阻力不應(yīng)低于14633kN;結(jié)果表明:龍王溝礦6號(hào)煤層綜放面支架選用5.0m×2.05m型,額定工作阻力為15000k N(兩柱掩護(hù)式),支護(hù)強(qiáng)度為1.46MPa,額定初撐力為12000kN,平均增載系數(shù)為1.23,可以保證工作面安全推進(jìn)。同時(shí)也為煤層地質(zhì)條件類似的礦井生產(chǎn)實(shí)踐提供了科學(xué)的參考依據(jù)。
[Abstract]:Longwanggou Coal Mine is located in the central and northern part of Zhunger Coalfield in Inner Mongolia Autonomous region, located in Xue Jiawan Town, Zhungeer Banner, Ordos City. The main coal seam is No. 6 coal seam, with a dip angle of 0 擄and 5 擄, an average burial depth of 354m, a mining thickness of 4.00 mb ~ (30.10) m and an average of 20 m. The coal is single, the gangue intercalation is 0.32, and the lithology is dominated by mudstone. The roof is mainly composed of sandy mudstone and siltstone, and the bottom plate is mainly composed of sandy mudstone and mudstone. This paper takes the geological conditions of Longwanggou coal mine as the background. Firstly, according to the coal seam burial depth, coal body strength and thickness, joint fissure, roof condition, mining caving ratio and coal caving mouth size position, it is concluded that the caving ability of coal seam No. 6 is general. Secondly, by using the physical similar material simulation experiment method, it is concluded that the direct roof follows with the mining in the initial mining period, and the pressure step distance of the main roof cycle is 14 m or 37 m (average 23 m / m). With the advance, "cantilever beam" appears in the upper strata of the working face, and the formation of the "masonry beam" and the "cantilever beam" occur. Instability and alternating structure are the causes of periodic pressure of fully mechanized top coal caving face. At the same time the bearing pressure increases and the peak value is between 9.2MPa~11.7MPa. Through numerical simulation and theoretical calculation, it is concluded that the square roof on the coal face wall is the composite failure of shear and tension, and the roof above the goaf is the main failure form of tension. The working resistance of the support should not be lower than 14633kN.The results show that the support of fully mechanized caving face of No. 6 coal seam in Longwanggou Coal Mine is 5.0m 脳 2.05m. The rated working resistance is 15000kN (cover type of two columns, support strength is 1.46MPa, rated initial support force is 12000kN, average load increasing coefficient is 1.23), which can ensure safe advance of working face. At the same time, it also provides a scientific reference for coal mine production practice with similar geological conditions.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD323

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1 陸明心,郝海金,吳健;綜放開采上位巖層的平衡結(jié)構(gòu)及其對(duì)采場(chǎng)礦壓顯現(xiàn)的影響[J];煤炭學(xué)報(bào);2002年06期

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本文編號(hào)：1815458