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介绍了演马庄煤矿 2 70 2工作面突出煤层炮采放顶煤效果检验的方法和防止煤与瓦斯突出所采取的措施 ,提出突出煤层炮采放顶煤工作面瓦斯抽放是防止煤与瓦斯突出的有效手段 ,当工作面有煤与瓦斯突出危险时 ,采取恰当的防突措施 ,能够降低煤与瓦斯突出的危险程度 ,可供同类工作面回采时借鉴 相似文献
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复杂条件下大倾角对放顶煤冒放规律的影响研究 总被引：1，自引：0，他引：1
根据申家庄煤矿2208工作面具体的工程地质条件,理论分析了大倾角对顶煤冒放性的影响,指出大倾角将使工作面上、中、下部产生三种性质不同的力学结构,并通过RFPA有限元软件分别对这三种结构的冒放特征进行了数值模拟,揭示了大倾角煤层顶煤的冒放规律,对该矿优化采煤工艺、提高煤炭采出率有重要指导意义。 相似文献
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根据申家庄煤矿2208工作面具体的工程地质条件，理论分析了大倾角对顶煤冒放性的影响，指出大倾角将使工作面上、中、下部产生三种性质不同的力学结构，并通过RFPA有限元软件分别对这三种结构的冒放特征进行了数值模拟，揭示了大倾角煤层顶煤的冒放规律，对该矿优化采煤工艺、提高煤炭采出率有重要指导意义。 相似文献
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通过对北京矿务局木城涧煤矿不具备常规条件下十槽煤底分层的相似材料模拟试验研究 ,证明了回采上分层时顶板冒落情况和矿压显现规律 ,初步探明了留与不留煤皮假顶情况下 ,回采下分层时顶板岩层二次失稳情况和矿压显现规律 ,为类似条件下开采底分层制定合理的回采方案、安全技术措施等提供重要的依据 相似文献
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洛阳常村煤矿开采煤层为"三软"特厚煤层,井田范围内村庄较多.为了合理回采村庄下煤柱、提高资源采出率,需要掌握该地质条件下的地表移动变形规律及参数.在该矿"三软"特厚煤层工作面建立了地表移动观测站,对地表沉陷进行现场观测,获得了大量的地表沉陷观测资料.通过对实测资料的分析,得出常村煤矿"三软"特厚煤层开采地表沉陷规律及其参数.研究结果表明:与一般地质采矿条件相比,"三软"特厚煤层放顶煤开采具有地表移动角量参数偏小、影响范围大、下沉系数大等特点,地表沉陷呈现塌陷坑及台阶裂缝形态. 相似文献
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煤层顶板垮落是煤矿生产常见的灾害,煤层顶板稳定性预测是防治顶板事故的关键技术措施。构造应力是影响煤层顶板稳定性的重要因素之一。利用FLAC3D软件,分析在构造应力的影响下煤层项板在采动过程中的变形破坏特征,以及不同侧压条件下煤层顶板的移动规律。结果表明,顶板破坏在岩梁中部是由下向上发展的,在一定的条件下,随着水平构造应力的增大,顶板破坏范围逐步减小,顶板岩层的位移逐步减小。 相似文献
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严红;翁明月;冯锐敏;李伟康 《中南大学学报(英文版)》2015,22(11)
A roadway within ultra-close multiple-seams(RUCMSs) is one of the most difficult supported coal roadways to deal with in underground coal mines. This is usually due to the unknown stress distributions, improper roadway layout, and unreasonable support parameters. In order to solve this support problem and effectively save RUCMSs from frequent and abrupt disasters(such as serious deformation of the surrounding rock, roof cave ins, and coal side collapse), a comprehensive method is adopted here which includes theoretical analysis, numerical simulation, and field monitoring. A mechanical model was constructed to determine the stress distribution in the coal pillar after two sides of a longwall panel had been mined. Based on this model, the horizontal, vertical, and tangential stress equations for the plane below the floor of the upper-left coal pillar were deduced. In addition, a typical coal mine(the Jinggonger colliery, located in Shuozhou city, Shanxi province, China) with an average distance between its 9# and 11# coal seams of less than 8.0 was chosen to conduct research on the proper layout and reasonable support required for a typical coal roadway located within coal seam 11#. Using FLAC3D(Fast Lagrangian Analysis of Continua in 3-Dimensions) numerical software, eight schemes were designed with different horizontal distances(d) between the center lines of the coal pillar and the roadway in the lower coal seam(RLCS). The simulations and detailed analysis indicate that the proper distances required are between 22.5 and 27.5 m. A total of 20 simulation schemes were used to investigate the factors influencing the support provided by the key bolts(bolt length, spacing, distance between two rows, installation angle, and pre-tightening force). The results were analyzed and used to determine reasonable values for the support parameters. Field results show that the stability and strength of the RLCS can be effectively safeguarded using a combination of researched stress distribution characteristics, proper layout of the RLCS, and correct support parameters. 相似文献
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综放面采空区遗煤自然发火过程动态数值模拟 总被引：21，自引：1，他引：21
通过对影响煤炭自燃因素的分析，建立了采空区内遗煤自燃过程数学模型，可随时预测不同漏风强度和不同推进速度的条件下，采空区遗煤自然发火的危险性．在计算机上对徐庄矿7235综放面采空区遗煤自燃过程中，氧化时间、工作面推进速度、遗煤厚度对煤温的影响进行了模拟，预报了在回采过程中采空区遗煤不自燃，而撤支架过程中确可能发生煤炭自燃，预报结果与实际相符。 相似文献
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通过对宜洛煤矿李沟井伪俯料放顶煤回采工作面的矿压观测,从4个方面研究了急倾斜伪俯斜放顶煤工作面矿压显现规律;（1）工作面的初次来压、周期来压步距和来压强度;（2）沿工作面走向控制区内的顶板压力状况,以及生产工序对控制区内支柱载荷的影响;（3）研究了沿倾斜方向矿压显现特点,分析了与近水平煤层矿压显现不同的原因;（4）观测了上下巷矿压显现规律,并分析了上下巷压力不同的原因．用统计法对伪俯斜放顶煤采煤法和分层开采上下巷矿压显现作了对比。 相似文献
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本文运用97个钻孔柱状图及测井曲线、12个钻孔的岩芯编录、岩矿地化及粒度分析等资料,通过编制层序图和分层图等得知城郊矿区三_4 号煤层顶板系淡水湖泊、分流河道、决口扇、沼泽等三角洲平原诸微环境下形成的沉积物根据 M.M.洛斯对煤层顶板稳定性的划分观点、将上述不同环境内所形成煤层顶板的稳定性划分为四种类型,同时指出各不同稳定性顶板的管理方法。 相似文献
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严红);张吉雄);李林玥);冯锐敏);李天彤) 《中南大学学报(英文版)》2018,25(2)
Failure of the surrounding rock around a roadway induced by roof separation is one major type of underground roof-fall accidents. This failure can especially be commonly-seen in a bottom-driven roadway within an extra-thick coal seam (“bottom-driven roadway” is used throughout for ease of reference), containing weak partings in their roof coal seams. To determine the upper limit position of the roof interlayer separation is the primary premise for roof control. In this study, a mechanical model for predicting the interlayer separation overlying a bottom-driven roadway within an extra-thick coal seam was established and used to deduce the vertical stress, and length, of the elastic, and plastic zones in the rock strata above the wall of the roadway as well as the formulae for calculating the deflection in different regions of rock strata under bearing stress. Also, an approach was proposed, calculating the stratum load, deflection, and limiting span of the upper limit position of the interlayer separation in a thick coal seam. Based on the key strata control theory and its influence of bedding separation, a set of methods judging the upper limit position of the roof interlayer separation were constructed. In addition, the theoretical prediction and field monitoring for the upper limit position of interlayer separation were conducted in a typical roadway. The results obtained by these two methods are consistent, indicating that the methods proposed are conducive to improving roof control in a thick coal seam. 相似文献
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兖州矿区放顶煤开采覆岩破坏规律探测研究 总被引：9，自引：0，他引：9
在利用井下仰孔探测技术探测了三个矿井放顶煤开采覆岩破坏高度的基础上, 总结分析了导水裂隙带的形态特征及其最大高度发育过程, 所得结论对于进一步研究放顶煤开采覆岩破坏规律及安全生产具有重要的参考与实用价值． 相似文献
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以理论分析、现场实测为基础,研究了大倾角煤层综放俯斜开采采煤机的受力及工作状态;提出了加高滑靴,调整摇臂摆动范围的采煤机防斜试验设计方案,并进行了现场试验与测试．结果表明,该方案简单易行,便于安装更换,工作稳定可靠． 相似文献
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《矿业科学技术学报(英文版)》2017,27(6):1081-1085
Mining induced pressures are strong and overburden failure areas are large in top coal caving longwall mining, which constrains high production and safety mining. By employing the combination of the full view borehole photography technique and the seismic CT scanner technique, the deformation and failure of overlying strata of fully mechanized caving face in shallow coal seam were studied and the failure development of overburden was determined. Results show that the full view borehole photography can reveal the characteristics of strata, and the seismic CT scanner can reflect the characteristics of strata between the boreholes. The combined measurement technique can effectively determine the height of fractured and caved zones. The top end of the caved zone in Yangwangou coal mine employing the top coal caving longwall mining was at the depth of 171 m and fractured zone was at the depth of 106-110 m. The results provide a theoretic foundation for controlling the overburden strata in the shallow buried top coal caving panel. 相似文献
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根据大地电磁频谱测量法的基本原理和特点,确定了相关的探测区大地电阻率模型,校正系数,将所得频率的标定直接转换为探测深度的刻度.通过探测实例,说明了大地电磁谱测量法在煤矿区探测陷落柱和识别煤层等的应用效果和应用前景. 相似文献
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通过对 9号煤层及其顶底板岩性的研究 ,得出如下结论 :9号煤层煤层厚度变化很大 ,但层位稳定 ,在现代开采技术条件下应属大部可采煤层 ;9号煤层顶板K4灰岩厚度不稳定、相变大 ,须注意小于 0 .5m厚度顶板范围及相变部位的顶板管理 ;9号煤层底板为高岭石粘土岩 ,遇水易膨胀底鼓 ,对综采机械化生产可造成影响 相似文献
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严红;何富连;李林玥;冯锐敏;邢鹏飞 《中南大学学报(英文版)》2017,24(5)
Cable truss systems have been widely applied in roadways with complicated conditions, such as the large cross-sections of deep wells, and high tectonic stress. However, they are rarely applied to roadways with extremely thick coal seams because the control mechanism of the system for the deformation of the roof and the separation between coal rock segments is not completely understood. By using the relationship between the support system and the roof strata, a mechanical model was established to calculate the deformation of the roof in a thick coal seam with bedding separation under different support conditions: with an anchor truss support and without support. On this basis, the research was used to deduce a method for computing the minimum pre-tightening forces in the anchor truss, the maximum amounts of subsidence and separation with, and without, anchor truss support under the roof, and the maximum subsidence and the decreasing amounts of the separation before and after adopting the anchor truss. Additionally, mechanical relationships between the minimum pre-tightening force and the anchoring force in the anchor were analyzed. By taking a typical roadway with thick coal roof as an example, the theoretical results mentioned above were applied in the analysis and testing of a roof supporting project in a roadway field to verify the accuracy of the theory: favorable experimental results were achieved. In addition, the relationships among other parameters were analyzed, including the minimum pre-tightening forces applied by the anchor truss, the angle of inclination of the anchor cable, and the array pitch. Meanwhile, the changing characteristics of the amounts of roof separation and subsidence with key parameters of the support system (such as array pitch, pre-tightening force, and inclination angle) were also analyzed. The research results revealed the acting mechanism of the anchor truss in control of roadway stability with a thick coal seam, providing a theoretical basis of its application in coal mining. 相似文献