本文選題：殘煤復(fù)采 + 煤柱寬度�。� 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：護巷煤柱回收是提高礦井柱式體系開采水平及資源回收率的重要途徑。房柱式采煤法工藝簡單,普遍應(yīng)用于陜北地區(qū)的中小型煤礦。因其采出率低,大量的煤炭資源深埋地下,不僅造成資源浪費,還為采空區(qū)自燃提供了條件,是煤礦安全生產(chǎn)的重要隱患。隨著資源整合的推進,眾多礦區(qū)的邊角煤及護巷煤柱回收問題受到了研究學(xué)者和工程技術(shù)人員的廣泛關(guān)注。與傳統(tǒng)的煤層房柱式開采相比,受煤層舊采區(qū)開采的疊加影響,復(fù)合殘采區(qū)煤柱回收時的礦壓顯現(xiàn)特征、采場巖層和煤柱的移動變形、可行性判定方法均有所不同。因此,本文以陜北神府礦區(qū)某煤礦5-2號煤層房柱式開采實際情況為基礎(chǔ),理論計算確定護巷煤柱合理寬度范圍;通過數(shù)值模擬,分析了舊采區(qū)煤柱群的穩(wěn)定性,探討確立復(fù)合殘采區(qū)煤柱群穩(wěn)定性判定依據(jù);根據(jù)采場結(jié)構(gòu)和現(xiàn)有開采條件,確定殘采區(qū)矩形煤柱布置方案;研究了殘采區(qū)不同寬度遺留煤柱回收的問題,得出煤柱群的應(yīng)力、位移以及塑性區(qū)分布規(guī)律,從而確定護巷煤柱寬度,優(yōu)化回收方案。結(jié)果表明:任何單一煤柱穩(wěn)定性理論都具有局限性,根據(jù)極限平衡理論建立數(shù)學(xué)力學(xué)模型,求得煤柱回收的穩(wěn)定寬度在15.6~20.2m范圍內(nèi);結(jié)合經(jīng)驗公式求得護巷煤柱寬度為28.6m,綜合分析得出煤柱合理寬度范圍為15.6~28.6m。鑒于原有采空區(qū)煤柱群整體穩(wěn)定,通過數(shù)值模擬分析了煤柱群穩(wěn)定性的依存條件,并將其中最危險一組煤柱中的應(yīng)力狀態(tài)作為后續(xù)護巷煤柱回收過程中煤柱群穩(wěn)定性判定依據(jù);考慮到煤柱回收過程中的工程因素,設(shè)置了殘采區(qū)采用采6留6的布置方案;4種不同寬度煤柱回收過程中,煤柱群應(yīng)力、位移以及塑性區(qū)范圍隨護巷煤柱寬度的減小呈增大態(tài)勢。計算得出,當護巷煤柱寬度不小于20m時,采場具有良好穩(wěn)定性;當護巷煤柱寬度為16m時,殘采區(qū)煤柱群應(yīng)力集中程度加劇,位移量增大,塑性區(qū)范圍擴展,無法保障煤柱穩(wěn)定性的需求。本文的研究為回收房柱式采空區(qū)遺留煤柱資源、評價采空區(qū)穩(wěn)定性提供了一條新的思路,為解決類似工程問題提供了借鑒性的研究方法,為進一步豐富和深化此類工程問題的研究體系奠定了良好的基礎(chǔ)。
[Abstract]:Pillar recovery is an important way to improve mining level and resource recovery rate of pillar system. The method of house-pillar coal mining is simple and widely used in small and medium coal mines in northern Shaanxi. Because of its low extraction rate and large amount of coal resources buried underground, it not only causes waste of resources, but also provides conditions for spontaneous combustion in goaf, which is an important hidden danger in coal mine safety production. With the development of resource integration, the problem of coal pillar recovery from edge coal and roadway in many mining areas has been paid more and more attention by researchers and engineers. Compared with the traditional coal seam roof pillar mining, under the influence of the superposition of the old coal seam mining area, the characteristics of mine pressure, the movement and deformation of stope and pillar, and the feasibility judgment method are different when the coal pillar is recovered in the compound residual mining area. Therefore, based on the actual situation of a coal mine in Shenfu mining area in northern Shaanxi Province, the reasonable width of coal pillar in roadway is determined by theoretical calculation, and the stability of coal pillar group in old mining area is analyzed by numerical simulation. This paper discusses the basis for determining the stability of coal pillar group in compound residual mining area, determines the layout scheme of rectangular coal pillar in residual mining area according to stope structure and existing mining conditions, studies the problem of recovering coal pillar of different width in residual mining area, and obtains the stress of coal pillar group. The displacement and the distribution of plastic zone can determine the width of coal pillar and optimize the recovery scheme. The results show that any single coal pillar stability theory has its limitations. According to the limit equilibrium theory, the mathematical mechanics model is established, and the stable width of coal pillar recovery is obtained in the range of 15.6m ~ 20.2m; According to the empirical formula, the width of coal pillar in roadway protection is 28.6m, and the reasonable width range of coal pillar is 15.628.6m. In view of the overall stability of the coal pillar group in the original goaf, the dependent conditions for the stability of the coal pillar group are analyzed by numerical simulation, and the stress state in the most dangerous group is taken as the basis for judging the stability of the coal pillar group in the recovery process of the coal pillar in the follow-up roadway. Considering the engineering factors in the process of coal pillar recovery, the stress of coal pillar group in the process of recovery of coal pillar with 4 different widths has been set up in the residual mining area using the layout scheme of mining 6, stay 6 and 4 different widths. The displacement and plastic zone range increase with the decrease of coal pillar width. The results show that the stope has good stability when the width of coal pillar is not less than 20m, and when the width of pillar is 16m, the stress concentration of coal pillar group in residual mining area increases, the displacement increases, and the plastic zone expands. Unable to guarantee the stability of coal pillar. The research in this paper provides a new way of thinking for recovering the remaining coal pillar resources and evaluating the stability of the goaf, and provides a reference research method for solving similar engineering problems. It lays a good foundation for further enriching and deepening the research system of this kind of engineering problems.
【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】：TD82;TD322

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