“三软”煤层炮采放顶煤工作面矿压规律研究

通过对红旗井中厚煤层炮采放顶煤工作面矿压观测分析,得出“三软”中厚煤层炮采放顶煤工作面的矿压显现特征,综合评价其支架的适应性与工作状态,为工作面支架选型提供依据,对同类条件下放顶煤工作面开采具有指导意义.     

轻型放顶煤支架在较薄厚煤层中应用可行性研究

炮采放顶煤开采技术在河南乃至全国中型矿井中得到了广泛应用,但炮面机械化程度低,而且存在较严重的安全事故隐患.针对红岭煤矿较薄厚煤层单体支柱炮放开采的地质条件,系统地观测了放顶煤工作面矿压显现,分析计算了工作面来压步距、来压强度,以及支架合理工作阻力等有关参数.根据红岭煤矿开采煤层围岩属于易控制围岩,计算了放顶煤液压支架工作阻力,提出了取代目前炮采放顶煤开采的综放工作面配套设备方案.研究结论为今后红岭煤矿实施轻型综合机械化放顶煤开采技术,提高矿井机械化程度和安全高效生产能力提供了技术支持.     

"三软"极不稳定煤层放顶煤开采工作面矿压规律及支护方式优选

通过对单体支柱、π型梁放顶煤一次采全高技术的开采试验,研究了在"三软"极不稳定煤层条件下,普通放顶煤开采工作面的矿压显现规律,试验研究了合理的支护方式及支护参数.实践和研究证明在"三软"极不稳定煤层中,单体支柱放顶煤一次采全高是一种与之相适应的高产高效开采技术.     

坚硬顶板特厚煤层预爆破放顶采煤试验

忻州窑矿8916工作面为坚硬特厚煤层,其顶板为坚硬岩层,采用中巷预爆的方法及优化参数后的放顶煤采煤法,控制了煤的块度,提高了煤炭回收率,减小了工作面矿压。     

演马庄煤矿突出煤层炮采放顶煤工作面防治煤与瓦斯突出的方法和措施

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     

演马庄煤矿突出煤层炮采放顶煤工作面防治煤与瓦斯突出的方法和措施

介绍了演马庄煤矿2702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.     

巨厚砾岩层下综放采场矿压显现规律

巨厚砾岩层下综放采场矿压显现规律研究对于采场围岩控制和安全生产具有重要的现实意义.采用理论分析和义马矿区千秋煤矿矿压观测方法进行研究,得出结论为:综放工作面围岩可控程度属于难控围岩,即采场顶底板围岩控制困难.选出了ZF7000-18/28型放顶煤基本支架及其综放面合理配套设备;现场观测研究了综放面矿压显现规律,得出了采场顶板来压步距、来压强度等参数.采场矿压显现明显,不同区域来压具有不一致性.顶板周期来压时支架循环末工作阻力最大值为4 307.70 kN,为支架额定工作阻力的61.54%.因此,采场支架可靠性能较高,现场应用试验效果显著,矿井实现了"一井一面"生产模式,推动了安全高效矿井建设.     

急倾斜放顶煤矿压显现规律的观测与研究

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。     

液压支架设计现状及发展趋势

本文简要介绍了我国液压支架在近十年来的迅速发展情况和计算机在液压支架设计中的应用。本文针对我国中厚煤层、特厚煤层储存丰富的特点,着重阐述了中厚采高支架、大采高支架、铺底网支架和放顶煤支架的性能和结构特点,并提出了电液控支架有着广阔的发展前景。     

放顶煤采场矿压显现规律的研究

通过对放顶煤开采方法的实验室相似材料模拟研究和现场矿压实测资料的分析,文章提出了放顶煤采场上覆岩层移动规律和采场矿压显现特征,同时还建立了放顶煤采场矿压结构模型。     

Mining pressure monitoring and analysis in fully mechanized backfilling coal mining face-A case study in Zhai Zhen Coal Mine

Fully mechanized solid backfill mining(FMSBM) technology adopts dense backfill body to support the roof. Based on the distinguishing characteristics and mine pressure control principle in this technology, the basic principles and methods for mining pressure monitoring were analyzed and established. And the characteristics of overburden strata movement were analyzed by monitoring the support resistance of hydraulic support, the dynamic subsidence of immediate roof, the stress of backfill body, the front abutment pressure, and the mass ratio of cut coal to backfilled materials. On-site strata behavior measurements of 7403 W solid backfilling working face in Zhai Zhen Coal Mine show that the backfill body can effectively support the overburden load, obviously control the overburden strata movement, and weaken the strata behaviors distinctly. Specific performances are as follows. The support resistance decreases obviously; the dynamic subsidence of immediate roof keeps consistent to the variation of backfill body stress, and tends to be stable after the face retreating to 120-150 m away from the cut. The peak value of front abutment pressure arises at 5-12 m before the operating face, and mass ratio is greater than the designed value of 1.15, which effectively ensures the control of strata movement. The research results are bases for intensively studying basic theories of solid backfill mining strata behaviors and its control, and provide theoretical guidance for engineering design in FMSBM.     

综放工作面矿压显现规律研究

通过对平顶山煤业 (集团 )公司十三矿综放工作面矿山压力及支架的受力特点进行综合分析和研究 ,探讨了该工作面的矿压显现规律 ,对于了解综放工作面的矿压规律、合理确定支架的工作阻力和结构型式有一定的借鉴作用 ,对于加强综放工作面控制、推广应用综放技术有着重要的意义     

薄煤层坚硬顶板采场矿压显现规律研究

根据大峪沟炭煤矿薄煤层坚硬顶板工作面支护改革前后矿压观测结果,分析了两种不同支护形式对顶板的控制作用,揭示薄煤层坚硬顶板条件下工作面矿压显现规律,为工作面支护改革和生产安全管理提供了科学依据.     

大倾角采煤工作面矿山压力显现规律的研究

通过对峰峰矿区薛村矿 92 71 2工作面矿山压力显现规律的研究 ,探明了大倾角“三软”煤层轻型支架放顶煤回采工艺在开采过程中矿山压力显现规律 ,为矿山支架选型、保证安全生产提供了依据     

Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods

To study the occurrence mechanism of rock burst during mining the irregular working face, the study took irregular panel 7447 near fault tectonic as an engineering background. The spatial fracture characteristic of overlying strata was analyzed by Winkler elastic foundation beam theory. Furthermore, the influence law of panel width to suspended width and limit breaking span of key strata were also analyzed by thin plate theory. Through micro-seismic monitoring, theoretical analysis, numerical simulation and working resistance of support of field measurement, this study investigated the fracture characteristic of overlying strata and mechanism of rock burst in irregular working face. The results show that the fracture characteristic of overlying strata shows a spatial trapezoid structure, with the main roof being as an undersurface. The fracture form changes from vertical “O-X” type to transverse “O-X” type with the increase of trapezoidal height. From the narrow mining face to the wide mining face, the suspended width of key strata is greater than its limit breaking width, and a strong dynamic load is produced by the fracture of key strata. The numerical simulation and micro-seismic monitoring results show that the initial fracture position of key strata is close to tailgate 7447. Also there is a high static load caused by fault tectonic. The dynamic and static combined load induce rock burst. Accordingly, a cooperative control technology was proposed, which can weaken dynamic load by hard roof directional hydraulic fracture and enhance surrounding rock by supporting system.     

大倾角煤层走向长壁开采顶板岩层活动规律及其矿压控制

依据现场观测和实验室研究的成果，总结了大倾角煤层走向长壁式开采采场矿压显现和顶板岩是活动规律，介绍了工作面矿压控制方法。     

Rock mechanical investigation of strata loading characteristics to assess caving and requirement of support resistance in a mechanized powered support longwall face

Longwall mining is one of the most acclaimed and widely used in underground method for coal extraction. The interaction of powered supports with the roof is the key issue in strata mechanics of longwall mining. Controlled caving of rock mass is a prerequisite pro thriving exploitation of coal deposits by longwall retreat with caving technique and support resistance has evolved as the most promising and effective scientific tool to predict various aspects related to strata mechanics of such workings. Load density,height of caving block, distance of fractured zone ahead of the face, overhang of goaf and mechanical strength of the debris above and below the support base have been found to influence the magnitude of load on supports. Designing powered support has been attempted at the different countries in different methods. This paper reviews the mechanism of roof caving and the conventional approaches of caving behaviour and support resistance requirement in the context of major strata control experiences gained worldwide. The theoretical explanation of the mechanism of roof caving is still continuing with consistently improved understanding through growing field experiences in the larger domain of geo-mining conditions and state-of-art strata mechanics analysis and monitoring techniques.     

“两硬”综放采场支架受载浅析

在现场观测基础上，分析了两硬（坚硬顶板，坚硬煤层）综放采场来压情况；运用回归分析，得出支架初撑力和循环最大工作阻力间的关系，由此给出确定放顶煤支架合理工作阻力的方法。