本文選題：大冶鐵礦　切入點：礦巖接觸帶　出處：《武漢科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：礦巖接觸帶巷道破壞變形嚴(yán)重影響了礦山的正常生產(chǎn)和人員的作業(yè)安全,對礦巖接觸帶巷道需及時有效地進(jìn)行支護(hù)。通過對大冶鐵礦礦巖接觸帶巷道破壞變形特征進(jìn)行分析,巷道的破壞變形主要由礦巖接觸帶兩側(cè)巖體的變形不協(xié)調(diào)所導(dǎo)致,需要研究針對其破壞變形特點的支護(hù)方案對巷道礦巖接觸帶巷道進(jìn)行支護(hù)。基于此,通過拉拔試驗、理論分析、數(shù)值模擬和現(xiàn)場監(jiān)測等手段,對大冶鐵礦礦巖接觸帶巷道支護(hù)方案和巷道變形分析開展了系統(tǒng)的研究。開展了不同錨固長度下玻璃鋼錨桿拉拔試驗,拉拔試驗結(jié)果表明玻璃鋼錨桿拉拔力隨著錨固長度的增加而增加,確定了礦巖接觸帶巷道玻璃鋼錨桿支護(hù)的錨固方式為全長錨固;塑性區(qū)分析表明玻璃鋼錨桿在支護(hù)時其錨桿長度應(yīng)大于1.52m,設(shè)計錨桿長度為1.6m、1.7m、1.8m和沒有錨桿支護(hù)的四種支護(hù)方案,對礦巖接觸帶巷道支護(hù)進(jìn)行數(shù)值模擬分析,確定了支護(hù)時玻璃鋼錨桿的長度為1.7m,錨桿外露長度為0.1m,錨桿錨固長度為1.6m。根據(jù)大冶鐵礦礦巖接觸帶巷道破壞變形特征,提出了噴錨網(wǎng)玻璃鋼錨桿非對稱支護(hù)、“X”抗剪支護(hù)、非均勻預(yù)應(yīng)力支護(hù)和對比方案管縫錨桿支護(hù)四種礦巖接觸帶巷道初選支護(hù)方案,建立了基于Euclid距離和灰色關(guān)聯(lián)度的改進(jìn)TOPSIS理想解法的巷道支護(hù)方案綜合評價優(yōu)選模型,確定了噴錨網(wǎng)玻璃鋼錨桿非對稱支護(hù)方案為最優(yōu)支護(hù)方案。最優(yōu)支護(hù)方案的可靠性分析表明礦巖接觸帶巷道在采用噴錨網(wǎng)玻璃鋼錨桿非對稱支護(hù)方案進(jìn)行支護(hù)時其支護(hù)結(jié)構(gòu)的可靠度為0.9005,表明最優(yōu)支護(hù)方案在巷道支護(hù)中是安全可靠的。對采用最優(yōu)支護(hù)方案支護(hù)的大冶鐵礦試驗巷道變形進(jìn)行監(jiān)測,其變形規(guī)律為先快速增大后逐漸平穩(wěn);建立了基于灰色神經(jīng)網(wǎng)絡(luò)的礦巖接觸帶巷道變形預(yù)測模型,對試驗巷道的變形進(jìn)行了預(yù)測研究,預(yù)測結(jié)果與實際值接近,預(yù)測精度較高,由預(yù)測結(jié)果可知礦巖接觸帶巷道在支護(hù)后期出現(xiàn)的最大變形量在巷道變形允許的范圍內(nèi),表明噴錨網(wǎng)玻璃鋼非對稱支護(hù)方案具有較好的支護(hù)效果。通過大冶鐵礦現(xiàn)場試驗巷道的支護(hù)情況對最優(yōu)支護(hù)方案進(jìn)行改進(jìn)。研究確定了噴錨網(wǎng)玻璃鋼錨桿非對稱支護(hù)方案為大冶鐵礦礦巖接觸帶巷道支護(hù)方案,該支護(hù)方案能有效的控制大冶鐵礦礦巖接觸帶巷道的破壞變形,提高巷道的穩(wěn)定性,為礦山的安全生產(chǎn)和人員作業(yè)安全提供了保障。
[Abstract]:The damage and deformation of roadway in contact zone of ore and rock have seriously affected the normal production of mine and the work safety of personnel. The roadway of contact zone of ore and rock should be supported in time and effectively. The characteristics of damage and deformation of roadway in contact zone of ore and rock in Daye Iron Mine are analyzed. The failure deformation of roadway is mainly caused by the disharmony of rock deformation on both sides of the contact zone of ore and rock. It is necessary to study the supporting scheme for the roadway in the contact zone of mine and rock according to its characteristics of failure and deformation. Based on this, the roadway is supported by drawing test. By means of theoretical analysis, numerical simulation and field monitoring, the supporting scheme and deformation analysis of roadway in contact zone of ore and rock in Daye Iron Mine are systematically studied. The drawing test of FRP bolt with different anchoring lengths is carried out. The results of drawing test show that the pulling force of FRP bolt increases with the increase of anchoring length. The analysis of plastic zone shows that the length of bolt should be more than 1.52m, the length of bolt should be 1.6m, 1.7mand 1.8m, and four kinds of supporting schemes without bolt support should be designed. The numerical simulation analysis of roadway support in contact belt of mine and rock is carried out. It is determined that the length of FRP bolt is 1.7 m, the length of bolt exposed is 0.1 m, and the length of anchor bolt is 1.6 m. According to the characteristics of roadway failure and deformation in contact zone of ore rock in Daye Iron Mine, this paper puts forward the asymmetric support of FRP bolt with shotcrete-bolting net, and the "X" shearing support. Non-uniform Prestressed support and contrast schemes four primary support schemes for rock contact zone roadway with pipe joint and bolt support are presented. An optimal comprehensive evaluation model of roadway support scheme based on Euclid distance and grey correlation degree is established, which is based on an improved TOPSIS ideal solution. The unsymmetrical support scheme of shotcrete-bolting net FRP bolt is determined as the optimal supporting scheme. The reliability analysis of the optimal support scheme shows that the unsymmetrical support scheme of shotcrete-bolting net FRP bolt is used in the roadway of contact zone of ore and rock. The reliability of the supporting structure is 0.9005, which indicates that the optimal support scheme is safe and reliable in the roadway support. The deformation of the experimental roadway in Daye Iron Mine with the optimal support scheme is monitored. The deformation law of the roadway increases rapidly first and then becomes steady gradually, the prediction model of roadway deformation in contact zone of ore and rock based on grey neural network is established, and the prediction results of roadway deformation are close to the actual value, and the prediction accuracy is high. The prediction results show that the maximum deformation of the roadway in the late supporting period is within the allowable range of the roadway deformation. The results show that the asymmetrical support scheme of shotcrete anchor mesh glass fiber reinforced plastic (FRP) has a better supporting effect, the optimum support scheme is improved by the supporting condition of field test roadway in Daye Iron Mine, and the asymmetric support scheme of shotcrete anchor net FRP bolt is determined. The supporting scheme is the roadway support scheme of contact zone between ore and rock in Daye Iron Mine. This support scheme can effectively control the damage and deformation of the roadway in the contact zone of ore and rock in Daye Iron Mine, improve the stability of the roadway, and provide a guarantee for the safety of mine production and personnel operation.
【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TD353.6

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