發(fā)布時間：2018-10-08 19:45

【摘要】：本文以同生精通興旺煤礦實際地質(zhì)條件和前期生產(chǎn)情況為研究背景，采用現(xiàn)場調(diào)研和實踐、理論分析以及數(shù)值計算分析等方法對下部煤層房柱式開采條件下上覆巖層的活動規(guī)律進行了研究，并在此基礎(chǔ)上分析上部煤層受下部煤層房柱式開采的采動影響程度，論證上行開采的可行性。 為全面分析下部煤層不同的房柱式開采對上覆巖層活動規(guī)律的影響，在結(jié)合煤礦實際生產(chǎn)情況的基礎(chǔ)上，論文運用正交分析原理，考慮到采寬、留寬等主要因素對煤柱穩(wěn)定程度以及上覆巖層活動變形的影響，數(shù)值模擬采留比、采寬兩因素影響下12號煤層的房柱式開采，在此基礎(chǔ)上對上部9號煤層采用分步開挖進行數(shù)值模擬，研究下部煤層房柱式開采以及上行開采上部煤層過程中，采留比、采寬等因素對房柱式煤柱及其上覆巖層活動變形的影響。論文的主要研究結(jié)果如下： 1.當(dāng)采留比在1/2到2范圍內(nèi)時，采寬保持不變，采留比越大，應(yīng)力越容易在煤柱上集中，煤柱的穩(wěn)定性越差，采留比不變，采寬越大（所留煤柱越寬），煤柱的穩(wěn)定性越好，承壓能力強。上部煤層回采過程中，二次采動的影響會進一步影響煤柱的穩(wěn)定性，受到超前支撐壓力的作用，處于極限穩(wěn)定狀態(tài)的煤柱容易失穩(wěn)垮落。 2.下部煤層房柱式開采后應(yīng)力形成“增壓區(qū)”和“卸壓區(qū)”的交替分布，使上覆巖層產(chǎn)生不同程度的活動變形；當(dāng)采留比在1/2到2范圍內(nèi)時，采寬保持不變，采留比越小，應(yīng)力交替式分布越明顯，采寬內(nèi)越容易形成波浪，，采寬越大，波浪越明顯。受超前支撐壓力的影響，上部煤層二次采動會進一步加劇交替式分布，波浪進一步向上發(fā)展。 3.經(jīng)過理論分析和數(shù)值模擬計算，同生精通興旺煤礦9號煤層處于下部煤層開采后的裂隙帶，在平衡巖層之上，能夠形成平衡巖層結(jié)構(gòu)而不發(fā)生臺階錯動，可在12號煤層房柱式采空區(qū)的上部上行開采9號煤層。
[Abstract]:In this paper, based on the background of the study on the actual geological conditions and early production conditions of the flourishing coal mine, the field investigation and practice are adopted in this paper. Theoretical analysis and numerical analysis are used to study the activity of overlying strata under the condition of roof pillar mining in the lower coal seam, and on the basis of this, the influence of roof pillar mining on the upper coal seam is analyzed. The feasibility of upstream mining is demonstrated. In order to analyze the influence of different roof pillar mining in the lower coal seam on the activity law of overburden strata, based on the actual production situation of coal mine, the paper applies the principle of orthogonal analysis to consider the mining width. The influence of main factors, such as retaining width, on the stability of coal pillar and the active deformation of overlying strata, the numerical simulation of mining and retention ratio, and the influence of two factors, such as mining width, on the roof pillar mining of coal seam 12, are discussed. On the basis of this, numerical simulation is carried out on the upper 9 coal seam by step excavation, and the mining and retention ratio in the upper coal seam is studied in the lower coal seam, the roof pillar mining and the upper coal seam up mining. The influence of mining width and other factors on the deformation of roof pillar and its overlying strata. The main research results are as follows: 1. When the mining retention ratio is in the range of 1 / 2 to 2, the mining width remains constant, and the larger the mining retention ratio, the easier the stress is to concentrate on the coal pillar, the worse the stability of the pillar, the less stable the pillar, the wider the mining width (the wider the coal pillar is left), the better the stability of the pillar is. Strong bearing capacity. In the mining process of upper coal seam, the influence of secondary mining will further affect the stability of coal pillar, which is affected by the leading supporting pressure, and the pillar in the state of ultimate stability is easy to collapse. 2. After the roof pillar mining in the lower coal seam, the stress forms alternating distribution between the "pressurized zone" and the "pressure relief zone", which causes the overburden strata to produce varying degrees of active deformation, and when the mining / retention ratio is within 1 / 2 to 2, the mining width remains unchanged and the mining / retention ratio is smaller. The more obvious the stress alternating distribution is, the easier the wave is in the wide mining, and the larger the mining width is, the more obvious the wave is. Under the influence of leading support pressure, the secondary mining of upper coal seam will further aggravate the alternating distribution and further develop the wave. 3. Through theoretical analysis and numerical simulation calculation, the fracture zone of No. 9 coal seam in Xingxing Coal Mine after mining in the lower coal seam can be formed on the balance rock layer without the staggered step. Coal seam No. 9 can be mined in the upper part of the roof pillar goaf of No. 12 coal seam.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD823

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本文編號：2258041