【作者】 刘洪强；

【导师】 张钦礼；

【作者基本信息】 中南大学 ， 安全技术及工程， 2011， 硕士

【摘要】 随着浅部资源的逐渐耗竭,矿产资源开发向深部推进已成必然趋势。随着矿体开采深度的增加,地压活动将越来越频繁,必须采取科学的地压管理和监测手段,确保最大限度地安全回收深部矿产资源。本文针对新桥矿业有限公司(简称新桥矿)地下开采过程中浅部(-180m～-230m中段)未留永久性连续盘区矿柱,15～20万m2的采空区充填质量较差及接项困难等特殊条件,综合采用了理论分析、数值模拟、现场监测等手段,对深部(-230m～-270m中段)充填开采过程中的地压显现规律进行了系统分析和深入研究,取得了如下研究成果：(1)在总结岩体的破坏类型与破坏机理的基础上,从能量守恒角度分析了岩体破坏过程的中能量变化,探讨了影响采空区顶板、矿柱失稳的主要因素及力学机理。(2)运用能量守恒原理和尖点突变理论,建立了采场顶板-矿柱系统的力学模型,通过构建系统的突变势函数,揭示了顶板-矿柱系统突变失稳发生的机理及突变发生的充分条件和必要条件,并以此分析了新桥矿采场稳定性,得出了深部必须留设合理盘区矿柱的结论。(3)利用大型有限元分析软件MIDAS,模拟并分析了新桥矿-270m中段不同盘区矿柱布设方案下的地下采场的应力、位移情况,在兼顾经济效益与采场安全管理的前提下,提出了合理的盘区矿柱布设方案。(4)根据数值模拟结果并结合现场施工经验,设计了新桥矿深部岩体地压监测网。通过对取得位移数据的分析,验证了数值模拟的结果的可靠性,进而预测出地压显现较严重的区域,为采场安全、高效的回采提供了理论依据。更多还原

【Abstract】 With the gradual depletion of the shallow resources, mineral resources development has become the inevitable trend of advancing deep. Rock burst occurs frequently as the mining depth increases and maximize the recovery of mineral resources safely is ensured by the scientific management and ground pressure monitoring.The ground pressure activities in Xinqiao Mining Cooperation Ltd (shortly, XMC) which caused by the shallow sublevel (-180m～-230m) having no permanent continuous panel barrier, the 0.15-0.20 km2 large mined-out area’s being filled poorly and roof-contacted filling difficultly were analyzed and studied in detail, using such means as theoretical analysis, numerical simulation and ground pressure monitoring and aiming at the problem existing in the course of deep filling method (sublevel-230m～-270m). Main researching work and conclusions are summarized as follows:1. Based on fracturing mechanism and types of rock mass failure, the energy variation of rocks in failure process was studied on conversation of energy and the main factors that influenced the stability of the gob roof, the pillar and mechanical mechanism was discussed.2. The mechanical model of pillar and roof system was established, using the energy conservation principle and cusp catastrophe theory, According to the establishment of system potential function, the mechanism and necessary and sufficient conditions of catastrophe instability of pillar and roof system were revealed, and the stability of stope in XMC were analyzed based on it. A conclusion was drawn that the panel barrier would be necessary to be remained.3. Stress and displacement of underground stope in-270m with different design of panel barrier were simulated utilizing the large-scale finite element software MIDAS, and the design of panel barrier were optimized which took both economical benefit and site safety management into account.4. According to the numerical simulation results combined with on-site construction experience, the XMC’s ground pressure monitoring network was designed. The monitoring network was established by putting the taseometer and displacemeter into reasonable place, and the displacement data obtained were analyzed to verify the reliability of the numerical simulation and to predict the ground pressure area which appeared more serious, which provided a basis for the safe and effective mining.更多还原