高瓦斯综放采煤工作面瓦斯综合治理方案

针对佳新煤矿1504综放工作面瓦斯的实际情况,分析了该工作面的瓦斯主要涌出来源及涌出量,结合该矿通风系统及瓦斯抽采现状,在上下顺槽顺层、上隅角、措施巷道等采用钻孔、高位钻场、埋管、吊管多种方式抽放,以及增加工作面风量和局部风机对上隅角供风等综合措施治理瓦斯,从而解决了上隅角及回风巷瓦斯超限问题,确保了工作面安全高效生产,真正实现了高瓦斯综放工作面的高产高效。     

易自燃煤层特殊条件下综放开采工作面防火技术研究

分析了耿村矿１３０１工作面易自燃煤层特殊条件下综放开采工作面自然发火的危险性;探讨了因采空区漏风而引起的工作面自然发火的防治措施．经现场实施研究表明,均压通风、低风量供风、加快工作面推进速度的综合防火技术,成功地防止了自然发火,保证了综放开采工作面的安全生产．     

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.     

巨厚砾岩层下综放工作面冲击地压危险性评价和矿震发生特征分析

为有效监测和防治综采工作面冲击地压事故,以耿村煤矿巨厚砾岩层下综放工作面为工程背景,采用综合指数法评价综放工作面冲击地压危险性,利用微震监测结果研究综放工作面回采期间矿震特征。结果表明：（1）13230综放工作面冲击危险性指数为0.65,属于中等冲击地压类型;（2）综放工作面回采期间矿震主要发生在工作面前方顶底板煤岩体中,工作面处于“见方区”时发生矿震的频次、最大能量和总能量均明显高于“非见方区”的,“见方区”矿震的震源主要位于工作面前方中部顶底板煤岩体和运输平巷上帮顶板煤岩体中;（3）综放工作面顶板周期来压期间通常伴随大能量的矿震事件。研究结果可为耿村煤矿综放开采冲击地压监测和防治提供参考。     

综放沿空小断面留巷技术研究

随着开采强度的增加，综放工作面的瓦斯超限问题日益突出．以王庄煤矿5201综放面为例，提出采用综放沿空小断面留巷技术，布置J型通风系统，治理综放工作面瓦斯超限．由关键块的分析和数值模拟结果，确定了综放沿空小断面留巷的断面形状，给出了斜梁的合理支护设计．矿压观测结果表明，留巷小断面变形以及留巷煤帮深部位移有较好的收敛性，能够满足工作面抽放瓦斯的需要．     

综放回采巷道围岩力学特征实测研究

通过对综放面回采巷道围岩的深部位移、表面位移、应力分布以及支架荷载的实测分析，得出综放面回采巷道围岩力学特征分布规律．研究表明，临近工作面巷道围岩处于支承压力降低区，支架荷载下降，但支架和围岩变形最剧烈，表明巷道围岩处于岩石峰后的力学状态．围岩变形主要发生支承压力影响区，合理的巷道支护应能控制采动影响剧烈阶段的围岩变形，顺槽支护设计理念应从载荷控制向变形控制转变．     

特厚煤层综放开采倾向大比例试验平台研制与应用

综放开采是我国特厚煤层高产工作面最主要的采煤方法,其中放煤方式是影响顶煤回收率的重要因素.为了提高特厚煤层综放开采顶煤回收率,基于综放开采顶煤放出散体介质流运移规律和特征,针对现有放顶煤试验平台工作面方向放煤试验较少、相似比例小、支架个数少、放煤口大小无法控制等问题,研制特厚煤层综放开采倾向大比例试验平台,相似比1:1...     

耿村煤矿综放开采覆岩移动和矿压显现规律研究

厚煤层综放开采矿山压力和围岩控制一直是综放开采研究的重点问题。基于义马矿区耿村煤矿特厚煤层综放工作面的地质采矿条件,采用数值模拟和现场矿压观测的方法,对综放工作面覆岩移动和矿压显现规律进行研究。结果表明:(1)综放工作面上方老顶形成"三铰拱"形砌体结构,该结构初次失稳和周期性失稳造成工作面初次来压和周期来压。老顶来压后,工作面前方支承压力趋于稳定,主要表现在最大应力集中系数和塑性区范围基本保持不变。(2)综放工作面顶板周期来压步距14.4~17.5 m,平均16.2 m,顶板来压动载系数1.81~2.04,平均1.92,顶板来压明显但较缓和。顶板来压期间支架时间加权平均工作阻力为其额定工作阻力的72.2%,选用ZF8600/18/35D型放顶煤液压支架合理。研究结果可为义马矿区综放开采围岩控制提供技术支撑。     

特厚煤层综放开采顶煤遗失机理及放煤步距优化数值模拟研究

为确定特厚煤层综放开采的合理放煤步距,探究放煤步距对顶煤遗失和回收率的影响机理,以塔山煤矿8222综放工作面为工程背景,采用CDEM颗粒-块体单元耦合数值模拟方法,建立考虑液压支架支撑作用的二维走向开采数值模型,研究特厚煤层综放开采放煤步距对遗煤形态、放煤漏斗、煤岩分界线等的影响,揭示“见矸关门”条件下的顶煤遗失机制,探索顶煤在采空区内随综放工作面循环推进的遗失规律。结果表明：随着综放工作面不断推进,液压支架上方的矸石提前到达放煤口,采空区一侧部分顶煤未能放出而留在采空区内,造成顶煤遗失;放煤步距对煤岩界面形态和煤岩相互侵入有显著影响,进而影响顶煤回收率和混矸率;通过数值分析、顶煤回收率和总回收量指标确定了塔山煤矿8222综放工作面12 m顶煤厚度下最佳放煤步距,为0.8 m。     

综采放顶煤工作面粉尘的综合防治

随着综采放顶煤开采技术的推广应用,使工作面高浓度粉尘的防治难题日趋突出,为此,本文通过分析综放工作面各种防尘措施的治理效果,提出了“标本兼治”是综合治理综放工作面高浓度粉尘的根本原则。     

“三软”厚煤层瓦斯抽放方法研究

告成煤矿的主采二1煤层属典型“三软”厚煤层,回采工作面隅角和回风流中瓦斯体积分数超限的主要原因是采空区瓦斯涌出过多,采取顶板岩石钻孔的方法对采空区冒落带及冒落裂隙带的瓦斯进行抽放,降低了回采工作面隅角和回风流中的瓦斯体积分数,避免了采煤工作面隅角和回风流瓦斯体积分数超限,同时克服了工作面风速超限的问题.实践表明,顶板岩石钻孔抽放冒落带及冒落裂隙带的瓦斯,是解决“三软”厚煤层瓦斯超限的有效途径.     

Development of 3D top coal caving angle model for fully mechanized extra-thick coal seam miningOA

During high-intensity, fully mechanized mining of extra-thick coal seam, the top coal would cave to a certain 3D form. Based on the data collected during drilling, a 3D model of top coal caving surface space was established to determine the relationship between the location of the stope roof and the caving surface,enabling the mathematical computation of the top caving angle(φ). The drilling method was employed to measure the top caving angle on two extra-thick fully mechanized coal caving faces...     

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     

Technical parameters of drawing and coal-gangue field movements of a fully mechanized large mining height top coal caving working face

Under fully mechanized, large mining height top coal caving conditions, the shield beam slope angle of the support increases due to the enlargement of the top coal breaking and caving space. This results in a change of the caving window location and dimensions and, therefore, the granular coal-gangue movement and flows provide new characteristics during top coal caving. The main inferences we draw are as follows. Firstly, after shifting the supports, the caved top coal layer line and the coal gangue boundary line become steeper and are clearly larger than those under common mining heights. Secondly, during the top coal caving procedure, the speed of the coal-gangue flow increases and at the same drawing interval, the distance between the coal-gangue boundary line and the top beam end is reduced. Thirdly, affected by the drawing ratio, the slope angle of the shield beam and the dimensions of the caving window, it is easy to mix the gangue. A rational drawing interval will cause the coal-gangue boundary line to be slightly behind the down tail boom lower boundary. This rational drawing interval under conditions of large mining heights has been analyzed and determined.     

综放工作面采空区内“三带”范围的确定与分析

通过对阳泉三矿 1 5号煤层 80 60 6工作面的具体分析 ,确定了综放工作面采空区内的“三带”范围 ,为防治综放工作面自然发火提供了依据     

Research on Feasibilityof Top-Coal Caving Based on Neural Network Technique

Based on the neural network technique, this paper proposes a BP neural network model which integrates geological factors which affect top-coal caving in a comprehensive index. The index of top-coal caving may be used to forecast the mining cost of working laces, which shows the model‘s potential prospect of applications.     

新登煤矿三水平综放工作面瓦斯涌出量预测

通过采用分源法和矿山统计法相结合的预测方法,综合分析得出了三水平初期开采阶段工作面采用轻放工艺回采时的瓦斯涌出量,极大地指导了矿井下一步的瓦斯管理和安全生产.     

Feasibility analysis of gob-side entry retaining on a working face in a steep coal seam

Based on the decline in exploitation of coal resources, steep coal seam mining and mining face tensions continue to explore the feasibility analysis of steeply inclined faces in the gob. One of the key factors in utilizing the technology of gob-side entry retaining in steep coal seams is to safely and effectively prevent caving rock blocks from rushing into the gob-side entry by sliding downwards along levels. Using theoretical analysis and field methods, we numerically simulated the mining process on a fully-mechanized face in a steep coal seam. The stress and deformation process of roof strata has been analyzed, and the difficulty of utilizing the technology is considered and combined with practice in a steep working face in Lvshuidong mine. The feasibility of utilizing the technology of gob-side entry retaining in a steep coal seam has been recognised. We propose that roadways along the left lane offshoot body use a specially-made reinforced steel dense net to build a dense rock face at the lower head. The results show that the lane offshoot branch creates effective roof control, safe conditions for roadway construction workers, and practical application of steeply inclined gob.     

低瓦斯矿井高产高效工作面瓦斯涌出规律

在全面系统研究的基础上提出了我国首家日产万吨高产高效工作面的瓦斯涌出规律，对低瓦斯矿井高产高效工作面瓦斯治理具有指导意义．