元宝山露天煤矿排土场边坡稳定性FLAC模拟

针对元宝山露天矿排土场边坡出现的不稳定现象,采用了FLAC—拉格郎日显式有限差分法对其进行了详细的分析和研究。通过研究,揭示了滑坡机理,对露天煤矿排土场边坡稳定性作出了客观评价,为露天矿下一步的工作方案、边坡监测方案的制定提供了决策依据,对实际生产有着重要的指导意义。     

Calculating stability of overburden dumps on weak bases

The scope of the discussion covers the issues of open pit mining efficiency and safety with dry overburden dumping over sludge base. The stress analysis of a dump at Kedrovsky Open Pit Mine uses finite element modeling of linearly deformable medium based on geotechnical, surveying and hydromechanical data. The modeling produces the field of displacements of the dump and its base and the distribution of the Mohr–Coulomb strength criterion. The sludge base breakout-hazardous areas are revealed, and the displacements of the growing dump are predicted. The developed model enables operational forecasting of strength loss at dumps.     

推覆体下孤岛综采工作面开采的实践

孤岛采煤一直是煤矿管理工作中的难点。文章介绍了新集二矿推覆体下孤岛工作面开采采用高强度锚杆、沿空送巷、化学注浆加固和边刷边安装等新技术、新工艺的成功经验。旨在为类似条件下的孤岛工作面开采提供参考。     

平朔安太堡露天矿斜坡内排方案研究

安太堡露天矿过背斜向下延深,顺坡内排无法跟进,内排空间不足,外排运距远,运输设备效率低,向下延深露煤进度慢等。针对上述问题,对斜坡内排技术进行研究,并经现场实践,安全可靠、技术经济效果明显。     

倾斜煤层综放开采覆岩破坏高度实测研究

在我国水体下采煤过程中,导水裂缝带的发育高度(简称导高)是确定防水煤岩柱尺寸、提高开采上限的一个重要的参数指标,对水体下安全开采、预防矿井水害具有重要的作用.当前厚煤层的开采又大多采用放顶煤开采技术,而传统经验公式仅适用于分层开采,文中利用井下导水裂缝带高度的现场探测方法不仅可以验证公式计算的正确性,同时其所得数据也更...     

月明山排土场边坡稳定性研究

介绍了东鞍山铁矿月明山排土场现状,在对排土场边坡稳定性分析的基础上,提出了增加排土场能力的措施,并确定了排土场扩容技术方案.     

斜采内排开采程序在霍林河南露天矿的应用

霍林河南露天煤矿通过优化采排关系,调整采矿布局,解决了内排发展速度慢、运距及提升高度不合理、选择合理工作线长度发挥大型设备效率、边坡稳定等问题,使南露天煤矿在技术管理和成本控制层面迈出了扎实的一步。     

Optimization of overburden drill dust control systems on surface coal mines

ABSTRACT

A significant problem at U.S. surface mining operations is complying with more stringent dust standards resulting from high respirable free silica concentrations. In areas where potentially harmful concentrations of silica-bearing dust exist, more stringent dust standards are applied to limit the amount of respirable free silica to which the workers are exposed. According to U.S. Mine Safety and Health Administration (MSHA) data, overburden drilling occupations have the greatest exposure to silica

Worker exposure may be reduced by reducing the amount of dust produced by the drill. This can be accomplished with either dry collection or wet suppression systems. Both of these systems were evaluated in the field, results of this testing are the subject of this paper. This work was performed under a U.S. Bureau of Mines contract by PEI Associates, Inc.

A special study of dry and wet systems was conducted to determine the proper operating parameters for each type of system. Shroud height was evaluated for dry systems and water flow rate was evaluated for wet systems. In the case of dry systems, it was found that a nearly Inverse relationship exists between shroud height and control efficiency. The dry system performed most efficiently when the shroud was positioned 0.23 m or less from the ground. In the case of wet systems, the control efficiency versus water flow rate curve showed a steep Increase in efficiency in the range of 0.09 to 0.11 m³/hr. The highest control efficiency (96%) was at a water flow rate of 0.27 m³/hr. Flow rates this high however, can cause operational problems, such as plugging of the drill bit

In general, the results of the study demonstrated the efficacy of control equipment available in the U.S. for overburden drills. Used In combination, dust control equipment, pressurized cabs, and personal protective equipment should allow U.S. surface mine operators to comply with more stringent dust standards at surface coal mines.     

大倾角松软煤层综放支架倾倒机理研究

在大倾角松软厚煤层综放工作面中,由于铰接式前梁的液压支架之间存在较大缝隙,同时工作面中上部顶煤破碎较充分,导致顶煤冒漏,支架失去工作阻力,在移架过程中易发生倾倒,并在顶板来压期间倾倒加剧。支架顶部铺设金属网、带压擦顶移架、伪斜布置工作面、从下至上移架、控制采高、自上而下单向割煤、自下而上和两采一放的放煤方式、增加防倒千斤顶等措施可有效避免倒架的发生。     

采空区稳定性对主斜井安全性的影响分析

在现场调查的基础上,针对某石膏矿采空区的分布状态及存在问题,运用Flac3D软件模拟分析了采空区的垮落对主斜井安全性的影响,为防治主斜井破坏提供了依据.     

特厚煤层重复开采覆岩与地表移动变形规律研究

为研究大同矿区特厚煤层重复开采覆岩与地表沉陷问题,以塔山煤矿8103和8104工作面的地质采矿条件为工程背景,沿倾向主断面建立了二维相似材料模型。反演分析了仅开采上覆侏罗系煤层时覆岩沉陷规律、两煤层重复开采时覆岩沉陷规律、离层发育规律、煤柱群垮塌规律以及地表塌陷规律,揭示了该地质采矿条件下覆岩与地表沉陷机理。研究结果表明：采用刀柱式采煤法开采侏罗系煤层,上覆岩层未发生显著的破坏和变形;在特厚煤层重复采动影响下,覆岩以一定的角度向上垮落和裂隙发育,当侏罗系煤层采空区受到下组煤开采扰动时,采空区中煤柱群受扰损伤,支撑能力降低,导致其上覆岩层沉陷加剧,在弯曲下沉带上方形成新的导水裂缝带,覆岩沉陷呈现“四带”发育特征。结合实测数据,分析了工作面沿倾向方向地表移动变形规律,基于Origin 8.0平台和概率积分法进行了二次开发,对倾向观测线上山方向实测下沉数据进行了拟合求参,获取了部分概率积分预测参数。研究结果可对大同矿区开采沉陷治理工程提供参考。     

Continuous mining and direct sidecasting of overburden in small surface mines

ABSTRACT

In all mines the operating costs depend largely on the type and size of the mining equipment. While a standard equipment is most often selected for small mines, considerable savings may be realized if the use of the continuous mining equipment is investigated. To facilitate such investigations, the paper describes the suitable continuous mining equipment, and discusses the mining methods applicable in small mines.     

矿井地面机械化排矸方式的选择和体会

动筛跳汰工艺是目前矿井地面排矸的重要方式之一。文章分析比较了液压和机械两种动筛跳汰排矸方式的优缺点,并详细介绍了液压跳汰机的工作原理及构成,总结了动筛跳汰排矸工艺设计中的应用体会。     

金正泰露天煤矿内排土场边坡稳定性研究

利用刚体极限平衡分析法(毕肖普法和剩余推力法)结合工坡稳定性分析软件以分析金正泰露天煤矿内排土场边坡稳定性,揭示其潜在滑坡机理,为该矿排土场稳定性研究提供了依据,也为其他矿排土场稳定性分析及研究提供参考。     

Estimate of the stability of stratified slopes based on the plastic theory

The study is carried out into the stability of edges of open pits with a stratified structure. The angle of the strata slope and the ultimate elastic compressive and shear strengths are assigned. The maximal allowable depth of an open pit is determined depending upon the pit edge incline. The problem is solved from the constructed equations of plasticity of a stratified material. The limiting loads under which the plastic zone come onto the pit side surfaces and cause the pit slope stability loss are calculated. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 49–60, July–August, 2007.     

覆岩离层产生机理及离层充填控制地表沉陷技术的工程实施

简要介绍了覆岩离层充填方法的技术原理 ,探讨了覆岩离层产生机理、离层分布规律及其影响因素 ,分析了离层充填控制地表沉陷技术的工程实施要点 ,所得结论对该技术的设计、施工与应用具有参考和指导意义     

采动地表倾斜变形对风力发电塔筒的影响研究

为在大型风电塔筒下实现安全采煤,以采动工作面上的风力发电塔筒为原型,采用ANSYS数值模拟软件分析研究了塔筒在不同地表倾斜变形情况下的轴向应力和变形特征关系,得到了不同地表倾斜变形下塔筒的轴向拉(压)应力、综合位移和最大倾斜率.研究结果表明:在开采影响下,随着地表倾斜变形的增加,塔筒的轴向最大应力呈线性增加趋势,塔筒的最大倾斜率也呈线性关系增加;当开采引起的地表倾斜变形超过安全临界倾斜变形时,塔筒最大轴向应力大于其许用应力,塔筒处于不安全的状态;塔筒自身的形态也对倾斜变形十分敏感,很小的倾斜变形都会使其发生破坏,对此对塔筒提出了相应有效保护措施.