厚煤层放顶煤大角度扇形收尾施工工艺实践

以左云长春兴煤业公司301综放工作面扇形收尾施工工艺为背景,介绍了在工作面受地质构造或者井田边界影响,工作面两顺槽与盘区大巷斜交布置时,为了多回收煤炭资源,提高经济效益,采取大角度扇形收尾的施工工艺,为厚煤层放顶煤大角度扇形收尾提供了借鉴和理论依据。     

薄小矿体有底柱浅孔留矿法高分段回采的研究

根据老矿山面临资源枯竭的现实,从技术、经济方面分析了开采薄小矿体的可行性。提出了有底柱浅孔留矿法高分段回采的方案,该方案已在易门矿的试验中获得成功,可供有关矿山借鉴。     

岩金矿山采空区处理现状及对策

岩金矿山以浅眼留矿法为代表的空场采矿法为主要开采手段，约占50％，每年形成数百万m^3采空区，并绝大多数未进行专门处理。本文介绍数例岩金矿山采空区处理方法及效果与对策，供有关企业参考。     

垂直平行束状孔爆破模型试验与分析

垂直平行密集束状孔落矿有底柱崩落法是一种新的采矿方法。通过爆破模型试验，测试爆破应力，观察分析爆破效果，探求最佳布孔形式，选择最优爆破孔网参数。试验结果表明：用平行束状孔取代扇形落矿，改善了爆破效果，简化了采场结构，减少了采切工程量。     

Numerical Simulation of Independent Advance of Ore Breaking in the Non-pillar Sublevel Caving Method

The mechanism of stress generation and propagation by detonation loading in five separate independent advance of ore breaking patterns is discussed in the paper. An elastic numerical model was developed using AN- SYS/LS-DYNA 3D Nonlinear Dynamic Finite Element Software. In this package ANSYS is the preprocessor and LS-DYNA is the postprocessor. Numerical models in the paper to actual were l：10 and the element mesh was dissected in scanning mode utilizing the symmetry characteristics of the numerical model. Five different advance rates were studied. Parameters, such as the time required to maximum stress, the action time of the available stress, the maximum velocity of the nodes, the stress penetration time, the magnitude of the stress peak and the time duration for high stress were numerically simulated. The 2.2 m advance appeared optimum from an analysis of the simulation results. The results from numerical simulation have been validated by tests with physical models.     

新城金矿采场落矿控制爆破技术

新城金矿为蚀变岩型金矿床,由于受地质构造影响,顶板稳定性较差,局部和较大面积的顶板冒落现象时有发生,为了解决采场顶板安全问题和提高落矿主要技术经济指标而进行了“上向水平分层尾砂胶结充填法采场控制爆破技术”的试验研究工作,试验达到了预期效果。     

测井资料在井壁稳定性研究中的应用

井壁稳定性问题是石油钻井工业面临的一个重大课题。利用测井资料研究井壁稳定性是一种有效的方法。文章利用声波、密度测井资料计算了岩石力学参数、岩石强度参数，在此基础上进行了地应力计算、进而确定了地层破裂压力和坍塌压力，预测了安全钻井液密度范围，为钻井设计提供参考，并可指导安全钻井。通过新疆X 201井安全钻井液密度窗口的测井预测值与实钻钻井液密度对比分析，证明利用测井资料评价井壁稳定性的可行性和准确性，具有工程应用价值。     

简易放顶煤工作面瓦斯综合治理技术

不稳定煤层采用单体液压支柱放顶煤开采技术,无疑是一种高效采煤方法。由于工作面采高大、单产高,且底层落煤与顶层放煤同时进行或工序间隔时间短,相应的采煤工作面瓦斯涌出量明显增大,采空区上部和工作面上方顶煤裂隙中易形成瓦斯积聚,从而严重威胁工作面的安全生产。本文通过分析简易放顶煤采煤工作面各生产工艺中瓦斯涌出规律,提出并实施有效的针对性综合瓦斯治理技术措施,实现了工作面的安全生产。     

工作面支架压力分析与3D显示联动特征信息提取

详细介绍了放顶煤工作面支架压力监测系统的设计及数据分析,通过分析得到工作面支架的工作状态,给出工作面各种设备3D显示的联动关系,使调度人员能清晰了解工作面的工作情况.对于提高调度指挥能力具有重要意义,同时也便于对工作面顶板管理进行有效的监管.     

Numerical simulation of land subsidence and verification of its character for an iron mine using sublevel caving

Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using UDEC.The stress field and displacement field changes of different sublevel stoping systems were also studied.Changes in the overlying rock strata settlement pattern has been analyzed and validated by in-situ monitoring data.The results show that:in the caving process,there exists an obvious delay and jump for the overlying rock strata displacement over time,and a stable arch can be formed in the process of caving,which leads to hidden goafs.Disturbed by the mining activity,a stress increase occurred in both the hanging wall and the foot wall,demonstrating a hump-shaped distribution pattern.From the comparison between simulation results and in-situ monitoring results,land subsidence shows a slow-development,suddenfailure,slow-development cycle pattern,which leads eventually to a stable state.This pattern validates the existence of balanced arch and hidden goafs.