本文選題：淺埋煤層 + 重復(fù)采動(dòng)��； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：隨著陜北侏羅紀(jì)淺埋煤層開采規(guī)模不斷擴(kuò)大,許多礦井開采的淺部煤炭資源逐漸枯竭,煤層開采已經(jīng)轉(zhuǎn)入淺部煤層的下層煤開采。由于開采距離較近,上部煤層采空區(qū)遺留煤柱對(duì)下部回采工作面產(chǎn)生極大的影響,常引發(fā)下部煤層回采工作面出煤柱的過程的動(dòng)壓災(zāi)害,造成壓架事故。本論文針對(duì)近距離淺埋煤層長壁工作面通過房柱采空區(qū)寬煤柱過程中的動(dòng)壓現(xiàn)象和壓架事故的特殊性,結(jié)合陜北集團(tuán)韓家灣煤礦下部煤層賦存狀況,采用物理相似模擬實(shí)驗(yàn)、計(jì)算機(jī)數(shù)值模擬和理論分析等綜合手段,從應(yīng)力場(chǎng)的變化和巖層運(yùn)移的角度分析回采工作面出房柱區(qū)動(dòng)壓機(jī)理分析可能引發(fā)動(dòng)壓事故的原因。揭示了下部煤層回采工作面過煤柱的動(dòng)壓現(xiàn)象的機(jī)理。下部回采工作面出房柱區(qū)的過程中,工作面超前支撐壓力的動(dòng)載作用與煤柱作用下的靜載作用疊加,并始終作用在工作面的前方�；夭蛇^程中引起房柱區(qū)底板下沉,房柱區(qū)遺留煤柱上部關(guān)鍵巖塊回轉(zhuǎn)失穩(wěn),失穩(wěn)的關(guān)鍵巖塊和煤柱上部層巖在Z方向的運(yùn)動(dòng)不再一致,上部覆巖運(yùn)動(dòng)速度較快,其動(dòng)能通過煤柱作用于下部巖層,煤柱上部關(guān)鍵巖塊的動(dòng)能通過煤柱傳遞至下部覆巖內(nèi),這三者疊加作用在回采工作面的前部,形成能量集聚區(qū)。煤柱底板巖層在其上的高集中應(yīng)力作用下巖層承載能力降低。同時(shí),由于工作面推進(jìn)過程中提供的空間及其的擾動(dòng)影響,使得集聚的能量突然釋放至工作面,使得工作面發(fā)生劇烈的動(dòng)壓現(xiàn)象。動(dòng)壓的發(fā)生具有突然性,劇烈性,對(duì)工作面的安全與支護(hù)具有極大的危害性。下部回采工作面通過其上部房柱區(qū)時(shí),必須預(yù)先處理其內(nèi)遺留的煤柱。通過計(jì)算機(jī)模擬實(shí)驗(yàn)分析煤柱寬度是影響其下動(dòng)壓的關(guān)鍵因素,因此提出通過超前預(yù)裂房柱區(qū)內(nèi)未失穩(wěn)的煤柱的手段控制下部回采動(dòng)壓的技術(shù)措施。
[Abstract]:With the expansion of the mining scale of shallow coal seam in Jurassic in Northern Shaanxi, the shallow coal resources of many mines are gradually exhausted, and the coal seam mining has been transferred to the lower coal mining of shallow coal seam. Because of the close mining distance, the coal pillar left over from the goaf of the upper coal seam has a great influence on the lower coal mining face, which often leads to the dynamic pressure disaster in the process of coal pillar extraction in the lower coal seam mining face, resulting in the pressure frame accident. In this paper, according to the phenomenon of dynamic pressure and the particularity of press frame accident in the long wall face of short distance shallow coal seam passing through the wide pillar of roof pillar, combined with the occurrence of coal seam in the lower part of Hanjiawan Coal Mine of Northern Shaanxi Group, the physical similarity simulation experiment is adopted. By means of computer numerical simulation and theoretical analysis, the causes of dynamic pressure accident caused by dynamic pressure in pillar area of mining face are analyzed from the point of view of the change of stress field and the movement of rock layer. This paper reveals the mechanism of dynamic pressure phenomenon of coal pillar in the lower coal seam mining face. In the process of coming out of the pillar area of the lower mining face, the dynamic load action of the leading supporting pressure of the working face is superposed with the static load action under the action of the coal pillar, and it always acts in front of the working face. In the process of mining, the bottom plate of the roof pillar area is sinking, the key rock block left over from the roof pillar area is rotated and unstable, the movement of the key rock block which is unstable is no longer consistent with that of the upper layer rock in the Z direction, and the velocity of the upper overburden rock is relatively fast. The kinetic energy of the coal pillar acts on the lower strata, and the kinetic energy of the key rock blocks above the pillar is transferred to the lower overburden rock through the pillar. These three superpositions act on the front part of the mining face and form an energy accumulation area. Under the action of high concentration stress, the bearing capacity of coal pillar floor is decreased. At the same time, due to the space provided by the working face and its disturbance, the accumulated energy is suddenly released to the working face, which makes the working face violent dynamic pressure phenomenon. The occurrence of dynamic pressure is sudden and violent, which is harmful to the safety and support of working face. When the lower mining face passes through the upper roof pillar area, it must deal with the coal pillar left behind in advance. The width of coal pillar is the key factor to influence the lower dynamic pressure of coal pillar by computer simulation experiment. Therefore, the technical measures of controlling the lower mining dynamic pressure by means of the unsteady pillar in advance pre-split room column area are put forward.
【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)】：TD823.81

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本文編號(hào)：1953305