【摘要】：孟加拉國(guó)Barakupuria煤礦(簡(jiǎn)稱(chēng)孟巴礦)井田范圍內(nèi)地表覆蓋有100余米厚的強(qiáng)含水松散層UDT,覆巖中除了LDT相對(duì)隔水層外,基本不存在隔水巖層,為了礦井生產(chǎn)安全,不但開(kāi)采覆巖導(dǎo)水裂縫帶不能波及UDT含水層,而且要保證LDT隔水層的完整隔水性。本文在分析孟巴礦地質(zhì)采礦條件特殊性的基礎(chǔ)上,應(yīng)用理論分析計(jì)算、數(shù)值模擬計(jì)算分析、現(xiàn)場(chǎng)探測(cè)分析等綜合方法,對(duì)孟巴礦強(qiáng)含水松散層下協(xié)調(diào)減損開(kāi)采技術(shù)進(jìn)行了深入研究,給出了適合孟巴礦地質(zhì)采礦條件的協(xié)調(diào)減損開(kāi)采方法。通過(guò)對(duì)孟巴礦井田地質(zhì)采礦條件分析,確定了UDT強(qiáng)含水松散層是威脅礦井安全開(kāi)采的主要含水層,協(xié)調(diào)開(kāi)采控制導(dǎo)水裂縫帶不破壞LDT隔水性能是孟巴礦水體下采煤的關(guān)鍵技術(shù)。其次通過(guò)理論分析,解釋了協(xié)調(diào)減損開(kāi)采的理論含義與減損原理,給出邊界協(xié)調(diào)錯(cuò)距布置,能夠分(次)段破壞釋放Ⅵ煤頂板砂巖,有效控制開(kāi)采覆巖導(dǎo)水裂縫帶發(fā)育高度,減小開(kāi)采邊界變形疊加,降低LDT相對(duì)隔水層變形破壞程度,減輕沖擊礦壓災(zāi)害威脅程度。結(jié)合地表沉陷觀測(cè)資料,應(yīng)用概率積分法確定礦井分層邊界協(xié)調(diào)錯(cuò)距的計(jì)算方法。通過(guò)數(shù)值模擬結(jié)果表明,分層協(xié)調(diào)錯(cuò)距布置對(duì)于減小邊界與煤柱的應(yīng)力集中有明顯的作用,能夠有效減輕沖擊礦壓災(zāi)害強(qiáng)度,可以保證導(dǎo)水裂縫帶不波及LDT相對(duì)隔水層,保障UDT水體下安全開(kāi)采。地表沉陷觀測(cè)數(shù)據(jù)計(jì)算表明,邊界錯(cuò)距協(xié)調(diào)布置,能夠有效減輕LDT相對(duì)隔水層的變形破壞程度。綜合分析確定孟巴礦強(qiáng)含水松散層下協(xié)調(diào)減損開(kāi)采技術(shù)方案。研究成果為進(jìn)一步深入研究特厚煤層分層開(kāi)采覆巖破壞規(guī)律奠定了基礎(chǔ),對(duì)制定孟加拉國(guó)Barakupuria煤礦水體下采煤綜合協(xié)調(diào)減損方案具有一定的參考應(yīng)用價(jià)值。
[Abstract]:The surface of Barakupuria coal mine in Bangladesh is covered with strong water-bearing loose layer UDT, overlying rock with a thickness of more than 100 meters. There are basically no water-insulating strata except LDT relative water insulation layer. For the sake of mine production safety, not only the mining of overlying water diversion fracture zone can not spread to UDT aquifer, but also the complete water insulation of LDT water insulation layer should be guaranteed. In this paper, based on the analysis of the particularity of geological mining conditions in Mengba Mine, the coordinated impairment mining technology under strong water cut loose layer in Mengba Mine is deeply studied by using the comprehensive methods of theoretical analysis and calculation, numerical simulation analysis and field detection analysis, and the coordinated impairment mining method suitable for the geological mining conditions of Mengba Mine is given. Based on the analysis of geological mining conditions in Mengba mine field, it is determined that UDT strong water cut loose layer is the main aquifer threatening mine safe mining. Coordinated mining control of water diversion fracture zone does not destroy LDT water insulation performance is the key technology of coal mining under water body of Mengba Mine. Secondly, through theoretical analysis, the theoretical meaning and principle of coordinated impairment mining are explained, and the coordinated dislocation arrangement of boundary is given, which can destroy and release VI coal roof sandstone in (secondary) section, effectively control the development height of water diversion fracture zone of overlying rock, reduce the superposition of mining boundary deformation, reduce the deformation and failure degree of LDT relative water insulation layer, and reduce the threat degree of rock burst disaster. Based on the observation data of surface subsidence, the probability integration method is used to determine the calculation method of coordinated dislocation distance of mine delamination boundary. The numerical simulation results show that the layered coordinated dislocation arrangement plays an obvious role in reducing the stress concentration of the boundary and coal pillar, can effectively reduce the intensity of rock burst disaster, can ensure that the water diversion fracture zone does not affect the LDT relative water insulation layer, and ensures the safe mining under UDT water body. The calculation of surface subsidence observation data shows that the coordinated arrangement of boundary dislocation can effectively reduce the deformation and failure degree of LDT relative to water insulation layer. The technical scheme of coordinated impairment mining under strong water cut loose layer in Mengba Mine is determined by comprehensive analysis. The research results lay a foundation for further study on the failure law of overlying rock in ultra-thick coal seam layered mining, and have certain reference and application value for formulating the comprehensive coordinated reduction scheme of coal mining under the water body of Barakupuria coal mine in Bangladesh.
【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】：2016
【分類(lèi)號(hào)】：TD823

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