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在沿空留(掘)巷条件不具备时,设计工作面须留设保护煤柱。通过对屯兰矿综采工作面布置及顶板特性分析,合理选择了窄煤柱巷道锚注联合支护方案,(采取锚索与注浆相结合的方法),达到提高支护效果、提高煤炭回收率、延长矿井服务年限、确保矿井安全生产目的。 相似文献
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王庄煤矿是有着40多年历史的老矿,随着矿井资源的日渐枯竭,煤柱工作面回收成为矿井今后攻克的重点,而在煤柱工作面掘进过程中,必须穿过许多空巷,穿越空巷时如何对空巷进行支护成为研究的重点。 相似文献
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针对大采高综采工作面护巷煤柱留设造成煤炭资源损失的问题,以长平矿大采高综采工作面为研究对象,分析了护巷煤柱的应力分布规律,揭示了小煤柱护巷原理,设计了6 m小煤柱的配套巷道支护方案,并进行现场实测。实践表明:在工作面采动之前,矿井巷道顶底板的变形量基本小于10 mm,在工作面采动过程中,巷道顶底板的最大位移量为450 mm,监测数据表明,小煤柱护巷以及配套的巷道支护方案是可行的。 相似文献
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采用理论分析和现场实测的方法,深入细致地研究了寺河煤矿大采高工作面的合理煤柱尺寸留设问题,达到了确保大采高工作面巷道的支护安全、减少采区的煤柱损失和提高矿井的技术经济效益的目的。 相似文献
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采用窄煤柱沿空送巷大断面锚网索支护的方式,有效地避开了矿井压力高峰区,减少了巷道受矿井压力的影响,不但提高了巷道支护质量,降低了巷道维修量,而且提高了回采率,减少了煤柱的损失,满足了高产高效工作面和安全生产的要求,提高了煤炭资源回收率和经济效益。 相似文献
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麦捷矿属高瓦斯矿井,目前掘进的150206轨道顺槽工作面靠近井田边界,地质构造条件复杂、瓦斯涌出异常,给工作面掘进作业带来较大的安全隐患。综合巷道瓦斯异常涌出量数据、矿井地质报告数据、煤体原始瓦斯含量数据以及采掘接替顺序分析研究发现在高应力和断层的共同作用下,邻近矿井采空区瓦斯通过断层及煤柱向工作面涌出,矿井采取增大供风量、增大保护煤柱宽度、加强支护强度和加强监测监控等针对性措施有效降低了工作面及回风流瓦斯浓度,保证了掘进作业安全。在工作面回采期间建议通过本煤层钻孔预抽、裂隙带钻孔抽采、加大超前支护范围、加强工作面及两巷应力监测和加强工作面端头管理等措施减少回采期间瓦斯涌出,保证回采的安全。 相似文献
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煤矿废弃后地下水位重新回升,并对矿井边界的隔离煤柱产生破坏作用,对邻近生产矿井造成极大的突水威胁。根据矿井间隔离煤柱组成及其所受侧向支撑压力的分析,获得隔离煤柱遭到破坏的最大水压计算公式。通过建立典型废弃矿井理论模型,并进行地下水位回升模拟计算,获得水位变化资料,利用公式获得了此模型中隔离煤柱破坏的临界水位和可能破坏的时间,分析了邻近矿井突水威胁程度。 相似文献
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露天矿边坡失稳的情况多有发生,分析影响边坡失稳的原因,水对露天矿边坡的影响是不可轻视的。防水与排水工作虽然是露天矿山的辅助生产工作,但它却是保证矿山安全和正常生产的先决条件。本论文在总结前人的基础上,将水对露天矿边坡的影响因素做了梳理,分析了水对露天矿边坡的危害,根据不同的边坡岩土体的特点,设置安全可靠有效的防排水措施,主要包括:地表水、地下水防治;抗滑桩、锚杆锚索加固;露天矿采场留设防水矿柱等。与此同时提出采取植被防护边坡的措施。最终分析不同的边坡岩土体特点,采取综合的边坡治理措施,建设安全、绿色、环保的露天矿山。 相似文献
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针对康家湾铅锌金矿大型防水矿柱的赋存条件,从技术经济角度论证了防水矿柱安全开采的可行性,为该矿超前开采防水矿柱提供了参考依据,亦可为类似条件的矿山借鉴。 相似文献
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Conclusions Thus, the completed studies have made it possible to develop a technology and methodology, based on the compensation method,
for measuring the load on the edges of inter-chamber pillars. An experimental-theoretical method has also been proposed for
estimating the residual life of such pillars in excavated sections of potassium mines.
The results of full-scale measurements established that the edge regions of interchamber pillars located near the boundary
of a cave-in (region of chamber 103 in our investigation) are in the supercritical state. For a subsidence rate of 1.5 mm/day
at the surface, the residual life of such pillars is estimated to be 7–8 months.
The zone loaded by bearing pressure from the caved-in rock is shifted toward the interior of the goal (regiona of chamber
120). The load factor of the pillars exceeds the allowable value [C]=0.4 specified by standards for “rigid” interchamber pillars
in the mines of the Verknekamsk Potassium Salt Deposit, which accounts for their “compliant” regime of deformation. Thus,
to reduce the strains of the water-protective stratum and prevent water above the deposit from entering the mine, the region
of chamber 120 must be filled.
Mining Institute, Ural Branch of the Russian Academy of Sciences (Perm). Translated from Fiziko-Tekhnicheskie Problemy Razrabotki
Poleznykh Iskopaemykh, No. 1, pp. 18–25, January–February, 1998.
The theoretical part of this investigation was completed with financial support from the Russian Fund for Basic Research,
Grant No. 96-05-64849. 相似文献
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为了减少矿山企业的采矿成本,提高矿山的经济效益,对无底柱分段崩落法的结构参数、多分段放矿等方面进行研究,分析与矿石的回收率和贫化率的关系。探讨以大间距结构参数为理论基础,结合矿山的实际放矿参数,确定正交试验因素,采用室内多分段放矿模型,分别对低贫化放矿和矿山现行截止品位放矿进行了试验,分别分析放矿结构参数与矿石回收率和贫化率的关系。采用计算机PFC~(3D)软件模拟低贫化放矿,将模拟所得数据采用回贫差因素分析方法进行分析,利用ORIGIN软件采用响应面法拟合函数分析回贫差和结构参数的关系,最后分析矿石回贫差与无底柱分段崩落法各结构参数的关系,结果表明提出的该矿山的无底柱分段崩落法结构参数为最优值。 相似文献
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随着开采强度的逐年增加,山西煤炭开采深度不断延伸,矿井地应力不断增大,对围岩的破坏与影响越加突出,给煤矿安全生产和顶板支护产生巨大威胁。研究发现,山西煤矿地应力南北差异较大,但总体地应力方向和山西NNE-NEE的区域现在构造应力场方向一致,部分地区受区域性地质构造的控制和影响较大,发生扭转。山西煤矿矿区水平应力总体上随深度的增加而增加。浅部水平应力的增加速度大于垂直应力,深部与垂直压力逐渐接近。地质构造复杂区、煤岩结构突变带、开采扰动区和不稳定煤柱等煤矿应力集中地带是山西煤矿地应力集中的高危区域,冲击地压发生可能性较大。 相似文献
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《International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts》1986,23(1):41-53
The Uwamuki deposit at Kosaka Mine consists of several stock-shaped ore bodies. The ore grade of the stock is high in the upper part, but decreases with depth. Usually in Kuroko Mines, for full extraction of high grade ores, the “underhand cut and fill mining method with artificial roof” has been adopted, but this involves a high mining cost. So the conventional method is unprofitable for the low grade and large ore bodies, and it has been replaced with the “overhand cut and fill mining method with pillars” utilizing a trackless mining system. In order to average crude ore grade and improve total production, upper high grade and lower poor grade portions have been mined, simultaneously, by the conventional and new method, respectively. Since the new method had never been attempted before in Kuroko mines and the mine pillars become slender with the mining stopes moving upward, several in situ measurements for monitoring of the behaviour of the mine pillars have been carried out. In addition, the interaction between the upper and lower stopes has been analyzed by the elastic FEM; and the support effect of filling has been clarified by non-linear FEM taking strain-softening into consideration. Based on the field measurements and theoretical analyses, one of the stock-shaped ore bodies was successfully stoped. The operating efficiency was improved by a factor of three and a cost reduction of 40% was achieved. 相似文献
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为改进小型石灰石矿地下开采采矿方法,结合新罗矿区22个石灰石地下矿山实际情况,进行了石灰石地下开采采矿方法选择的影响分析。基于新罗矿区小型石灰石地下矿山现状和存在问题,研究分析了如何改进小型石灰石地下矿山的采矿方法。得出结论:只采矿房不回收矿柱,实行一步骤回采,采用矿柱永久支撑法处理空区,是小型石灰石地下矿山很合适的空区处理方法;原采空区应采用“避开”或人工砌筑假柱完善矿柱支撑体系进行处理;改房柱法为留矿法进行采矿,能提高小型石灰石地下矿山回采率,使回采率从30%以内提高到40%~55%。 相似文献