本文選題：淺埋煤層 + 破壞機(jī)理��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：開展陜北地區(qū)淺埋煤層順槽圍巖破壞機(jī)理和頂板穩(wěn)定性分級及支護(hù)技術(shù)研究具有重要的工程應(yīng)用價值。本文以神南礦區(qū)某礦5-2煤順槽支護(hù)工程為依托,采用理論分析、室內(nèi)試驗(yàn)、數(shù)值模擬以及現(xiàn)場實(shí)測相結(jié)合的方式對矩形順槽頂板破壞機(jī)理、頂板穩(wěn)定性分級以及順槽支護(hù)技術(shù)等進(jìn)行了研究。主要工作和結(jié)論有:(1)分析了淺埋煤層矩形順槽頂板破壞形式和影響頂板穩(wěn)定性的主要因素,主要破壞形式有張拉破壞、剪切破壞、局部落石破壞以及復(fù)合破壞。影響順槽頂板穩(wěn)定性的主要因素有地質(zhì)條件、采動影響、地下水、斷面尺寸、埋深以及地應(yīng)力等。在此基礎(chǔ)上建立矩形順槽頂板力學(xué)模型,分析了順槽頂板破壞機(jī)理。(2)結(jié)合順槽頂板穩(wěn)定性主要影響因素,選取了頂板巖樣飽和單軸抗壓強(qiáng)度、煤樣飽和單軸抗壓強(qiáng)度、巖體完整性指標(biāo)、順槽埋深、順槽跨度、順槽高度和采高作為頂板穩(wěn)定性分級的指標(biāo)。針對神南某礦5-2煤工程地質(zhì)條件,將順槽頂板穩(wěn)定性分為Ⅰ級頂板(穩(wěn)定)、Ⅱ級頂板(中等穩(wěn)定)和Ⅲ級頂板(不穩(wěn)定)。根據(jù)懸吊理論和組合梁理論,結(jié)合已掘順槽支護(hù)效果反饋,確定了各級頂板的順槽支護(hù)參數(shù)。(3)對1506工作面順槽頂板煤巖樣進(jìn)行了物理力學(xué)試驗(yàn),得到了煤巖樣在自然與飽水狀態(tài)下的物理力學(xué)參數(shù)。通過層次分析法得到了各指標(biāo)權(quán)值,采用模糊綜合評判法,根據(jù)最大隸屬度原則判定1506工作面膠運(yùn)順槽和輔運(yùn)順槽頂板穩(wěn)定性等級為Ⅰ級(穩(wěn)定頂板),需采�、窦夗敯逯ёo(hù)參數(shù)進(jìn)行支護(hù)。由現(xiàn)場實(shí)測數(shù)據(jù)分析可知,1506工作面順槽掘進(jìn)和工作面回采期間順槽變形量較小,錨桿最大受力30.2kN,順槽支護(hù)效果較好,滿足工作面安全回采需求。(4)采用有限差分軟件FLAC~(3D)對5-2煤順槽各級頂板支護(hù)效果進(jìn)行了模擬,結(jié)果表明,Ⅰ、Ⅱ、Ⅲ級頂板在掘進(jìn)和回采期間順槽變形和塑性區(qū)范圍均較小,滿足順槽支護(hù)要求。本文研究淺埋煤層矩形順槽頂板破壞機(jī)理和頂板穩(wěn)定性分級及支護(hù)技術(shù),可為該地區(qū)其他礦順槽支護(hù)工作提供參考。
[Abstract]:It is of great value to study the failure mechanism, roof stability classification and supporting technology of shallow coal seams in northern Shaanxi. In this paper, based on the supporting engineering of 5-2 coal seam in Shennan mining area, the failure mechanism of rectangular roof along the slot is analyzed by theoretical analysis, laboratory test, numerical simulation and field measurement. The classification of roof stability and the technique of supporting along grooves are studied. The main work and conclusion are as follows: (1) analyzing the failure form of shallow coal seam rectangular trench roof and the main factors affecting roof stability, the main failure forms are tensioning failure, shearing failure, local rock falling failure and composite failure. The main factors affecting the stability of the roof along the channel are geological conditions, mining effects, groundwater, cross-section size, depth of burial and in-situ stress. On this basis, the mechanical model of rectangular slotted roof is established, and the failure mechanism of shunt roof is analyzed. Combined with the main influencing factors of the stability of the down-grooved roof, the saturated uniaxial compressive strength of roof rock sample and the saturated uniaxial compressive strength of coal sample are selected. The indexes of rock integrity, buried depth, span, height and mining height are the indexes of roof stability classification. According to the engineering geological conditions of 5-2 coal in Shennan coal mine, the stability of the shun trough roof is divided into class 鈪，

本文編號：1841438