大冶铁矿矿岩接触带巷道支护方案及变形分析研究

发布时间：2018-03-11 16:14

本文选题：大冶铁矿　切入点：矿岩接触带　出处：《武汉科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：矿岩接触带巷道破坏变形严重影响了矿山的正常生产和人员的作业安全,对矿岩接触带巷道需及时有效地进行支护。通过对大冶铁矿矿岩接触带巷道破坏变形特征进行分析,巷道的破坏变形主要由矿岩接触带两侧岩体的变形不协调所导致,需要研究针对其破坏变形特点的支护方案对巷道矿岩接触带巷道进行支护。基于此,通过拉拔试验、理论分析、数值模拟和现场监测等手段,对大冶铁矿矿岩接触带巷道支护方案和巷道变形分析开展了系统的研究。开展了不同锚固长度下玻璃钢锚杆拉拔试验,拉拔试验结果表明玻璃钢锚杆拉拔力随着锚固长度的增加而增加,确定了矿岩接触带巷道玻璃钢锚杆支护的锚固方式为全长锚固;塑性区分析表明玻璃钢锚杆在支护时其锚杆长度应大于1.52m,设计锚杆长度为1.6m、1.7m、1.8m和没有锚杆支护的四种支护方案,对矿岩接触带巷道支护进行数值模拟分析,确定了支护时玻璃钢锚杆的长度为1.7m,锚杆外露长度为0.1m,锚杆锚固长度为1.6m。根据大冶铁矿矿岩接触带巷道破坏变形特征,提出了喷锚网玻璃钢锚杆非对称支护、“X”抗剪支护、非均匀预应力支护和对比方案管缝锚杆支护四种矿岩接触带巷道初选支护方案,建立了基于Euclid距离和灰色关联度的改进TOPSIS理想解法的巷道支护方案综合评价优选模型,确定了喷锚网玻璃钢锚杆非对称支护方案为最优支护方案。最优支护方案的可靠性分析表明矿岩接触带巷道在采用喷锚网玻璃钢锚杆非对称支护方案进行支护时其支护结构的可靠度为0.9005,表明最优支护方案在巷道支护中是安全可靠的。对采用最优支护方案支护的大冶铁矿试验巷道变形进行监测,其变形规律为先快速增大后逐渐平稳;建立了基于灰色神经网络的矿岩接触带巷道变形预测模型,对试验巷道的变形进行了预测研究,预测结果与实际值接近,预测精度较高,由预测结果可知矿岩接触带巷道在支护后期出现的最大变形量在巷道变形允许的范围内,表明喷锚网玻璃钢非对称支护方案具有较好的支护效果。通过大冶铁矿现场试验巷道的支护情况对最优支护方案进行改进。研究确定了喷锚网玻璃钢锚杆非对称支护方案为大冶铁矿矿岩接触带巷道支护方案,该支护方案能有效的控制大冶铁矿矿岩接触带巷道的破坏变形,提高巷道的稳定性,为矿山的安全生产和人员作业安全提供了保障。
[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.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD353.6

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