深部回采矿柱失稳的尖点突变理论分析及宽度优化

发布时间：2018-06-04 19:14

本文选题：矿柱 + 稳定性　；参考：《中国安全生产科学技术》2017年07期

【摘要】：为正确估算矿柱承受载荷,运用普氏理论分析矿柱承载机理,指出矿柱承受载荷为上覆岩层拱形塑性区的重力,计算出矿柱体系中单个矿柱承受的平均载荷。建立矿柱失稳的尖点突变模型,推导出矿柱能量方程,分析矿柱失稳力学机制,根据矿柱失稳的充分条件和必要条件得出矿柱极限宽度值的计算方法,并分析主要因素对矿柱宽度极限值的影响规律。通过工程实例验证矿柱宽度计算方法的有效性和适用性。研究结果表明:影响矿柱宽度的主要因素包括开采深度、采场宽度和矿柱高度;以冬瓜山铜矿为例,矿柱宽度的理论计算值应大于3.63 m,数值分析选取矿柱宽度为4 m时,矿柱处于稳定状态.现场工业试验表明,宽度为4 m的矿柱稳定性较好。
[Abstract]:In order to estimate the bearing load of ore pillar correctly, the bearing mechanism of ore pillar is analyzed by using Plain's theory. It is pointed out that the bearing load of ore pillar is the gravity of arch plastic zone of overlying rock stratum, and the average load of single pillar in pillar system is calculated. The cusp catastrophe model of pillar instability is established, the energy equation of ore pillar is deduced, the mechanics mechanism of pillar instability is analyzed, and the calculation method of the limit width of pillar is obtained according to the sufficient condition and necessary condition of pillar instability. The influence of main factors on the limit value of pillar width is analyzed. The effectiveness and applicability of the calculation method of pillar width are verified by an engineering example. The results show that the main factors affecting the pillar width include mining depth, stope width and pillar height, and taking Dongguashan Copper Mine as an example, the theoretical calculation value of pillar width should be greater than 3.63 m, and when the pillar width is 4 m in numerical analysis, The pillar is in a stable state. The field test shows that the pillar with width of 4 m is stable.
【作者单位】：中南大学资源与安全工程学院;
【基金】：新疆维吾尔族自治区自然科学基金项目(201233146-2)
【分类号】：TD32;TD862.1

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