The method comprises: drilling injection freezing boreholes to coal seam with drilling equipment on coal mining working face of rock crosscut, arranging injection pipe lines along the injection freezing boreholes, and connecting a high pressure injection system to the injection pipe lines; starting the high pressure injection system, injecting to the coal seam to moisten coal; stopping injection when the coal seam is moistened, arranging low temperature freezing pipe lines, injecting and sealing holes to make the liquid full of the drilling holes, and starting a low temperature freezing system to freeze the coal seam; and beginning tunnel digging and coal mining work after coal being frozen.
本发明的方法是，先在石门透煤工作面上用钻孔设备向煤层打出注液冻结钻孔，沿注液冻结钻孔安装注液管线，并将高压注液系统连接到注液管线上；启动高压注液系统，向煤层内注液使煤体湿润；当煤层湿润后，停止注液，安装低温冷冻管线并封孔注液，使液体充满钻孔，启动低温冷冻系统，使煤层冻结；当煤体冻结后，再开始巷道的掘进和揭煤作业。
To meet the needs of the development of shearers in heavy duty and thick coal seam, the megawatt low-speed high-torque drive unit test system is required.
针对采煤机向大功率、厚煤层方向发展的需求，研制开发低速大扭矩传动装置试验系统。
The most favorable coal-accumulating environments in continental strata were systems of meandering river, meandering delta and coastal lake. The main features were as follows: the swamp behind bank in meandering river was important coal-accumulating environment, coal seams were presented as strip on plane, accumulated thickly vertically, extended far distance horizontally. The peat swamp developed in low-lying land between split streams of meandering river's delta plain had good tapability, wide distribution along lake shoreline. In coastal lake coal-accumulating environments lakeshore line stretched far distance, on the plane coal was distributed as strip, vertically several sets of carbonaceous mudstone and coal seam were interbeded because of multi-cycle of the lake level changes at the same time.
研究显示：曲流河的岸后沼泽为重要的聚煤环境，平面上煤层呈带状产出，垂向上往往形成较厚的煤层，且横向延伸较远；曲流河三角洲平原分流河道间洼地中发育泥炭沼泽，形成的煤层成带性好，具有沿湖岸线广泛分布的特点；滨湖聚煤环境中湖岸线延深较远，煤层在平面上呈带状展布，同时由于湖平面变化的多旋回性，在垂向上可形成多套碳质泥岩与煤层的互层。
A new damage model was built for explosive for LS-DYNA3D by taking advantage of Taylor method aimed at the high gassy and low permeability coal seam, and the deep-hole presplitting explosion was numerical simulated.
针对高瓦斯低透气性煤层，采用Taylor方法建立了一个新的LS-DYNA3D爆破损伤模型，对深孔预裂爆破进行了数值模拟研究，再现了爆破过程中，动压冲击震裂、应力波传播与叠加以及爆生气体驱动裂纹扩展的整个过程，分析了爆破孔间距对爆生裂纹和爆破增透效果的影响，提出了高瓦斯低透气性煤层深孔预裂爆破的合理间距为5-6 m，为高瓦斯低透气性煤层的瓦斯抽放提出了解决方案
Hunan Coal Geological Bureau in Shaoyang City Bridge mining to identify short-Pei, the mining coal seam containing two layers, a total coal resources of about 70 million tons for low-ash, low volatile, low sulfur, special heat value depleted Coal is a good impetus to coal, Hunan Province for the past decade or so found in the largest coal resources.
湖南省煤田地质局在邵阳市短陂桥矿区查明，该矿区含可采煤层两层，共有煤炭资源量约7000万吨，为中低灰、低挥发份、低中硫、特高热值的贫瘦煤，是一种较好的动力用煤，为近十多年来湖南发现的最大的煤炭资源地。
3Caving coal interval is as interger mutiple as web of winning machine, commonly use drawing top coal once per reamer, or once per two reamer once per three reamer, for winning machine of cylinder type, caving coal interval chang between 0.5-1.5m and 0.6-1.8m, low mining and caving coal and thickness of coal seam is less than 8m, usually use drawing top coal once per one reamer.
放煤步距是采煤机截深的整数倍，一般采用一刀一放、二刀一放、三刀一放等，故对于滚筒式采煤机，放煤步距变化在0.5～1.5m或0.6～1.8m之间。低位放顶煤且煤层厚度在8m以下时，一般采用一刀一放，煤层厚度较大时可采用小截深的二刀一放。
The law of crack development and fracture network formation of deep-hole pre-splitting control blasting in low permeability coal seam and the influencing factors of crack propagation are described. The important role of gas in outburst process is analyzed, at the same time, the effect of gas pressure relief in coal seam by concentration drainage and stopping flow and drainage gas are studied.
探讨了深孔控制爆破促使低渗透煤层形成贯通裂隙的机理及其裂纹扩展的影响因素，研究了瓦斯在突出过程所起的重要作用，分析了钻孔集中抽放和截流抽放对石门揭煤工作面前方待揭煤体的卸压作用。
Due to the low permeability of the coal reservoir in China, plastic deformation occurred and fracturing fluid caused serious damage to coal seam permeability during hydraulic fracturing operation.
由于我国煤储层的渗透率低，水力压裂作用于这类煤层时，主要是使煤层发生塑性变形，并且水力压裂过程中压裂液对煤层渗透率的伤害也是相当的严重。
The established coal bed methane influent mode can correctly shown the coal bed methane flow law in the coal seam, which would have a certain guidance to the development of low penetration anthracite coal seam in China.
所建立的煤层气扩散渗流模型较准确的反映了煤层中煤层气流动规律，对我国大面积低透气性无烟煤煤层气的开发具有一定的指导意义。
Study of Gas Exhausting and Mining Techniques on Outburst Coal Seam with Low Permeability for Strengthening Antireflection
低透气性突出煤层强化增透瓦斯抽采技术研究
The scientific foundation has been got for the reasonably arranging preventing coal seam and unloading pressure drawing gas in the low penetrability high gas content coal seam.
研究结果与现场实际考察结果基本吻合，可为低透气性高瓦斯煤层合理布置保护层和被保护层卸压瓦斯抽放提供科学依据。
Application of Rapid Excavation in Roadway of Low Gas Permeability & Outburst Coal Seam Based on Deep-hole Pre-splitting Control Blasting
卸压爆破在低透气突出煤层快速掘进中的应用
Due to the rareness in the research of its mechanism and moving regularity of water in coal seam, process parameters could only be determined by experience with great blindness and low efficiency.
煤层注水防治冲击地压的机理以及注水过程中，对水在煤层中的运动规律还缺乏研究，因而工艺参数决定只能依靠经验，存在很大盲目性，必然影响防治效果。
Through the research on trial, we have research into the adsorption isotherm and adsorption loop that the coal adsorbed low-temperature nitrogen, have probed into the meaning of hole shape and analyzed the influence of the microspore structure of coal on the coal seam permeability.
通过试验研究，考察了煤的低温氮吸附等温线及吸附回线，并探讨了孔形意义，分析了煤的原生孔结构对煤层渗透性的影响。
Resolution of coal seam thickness by using frequency tuning curves is higher, because of the low velocity and apparent wavelength of coal seam.
由于煤层速度较砂岩低，其视波长较小，在相同的厚度范围内利用频率调谐曲线可分辨的厚度也就比较薄。
Coal resource is abundant in China. But thin coal seam mining has not been realized mechanization, workload of workers is large and rate of resources recovery is low.
我国的煤炭资源丰富，薄煤层开采还没有完全实现机械化，工人劳动强度大，资源回收率低。
To study mass exchange relation between them is of important significance to exploit low permeability methane in coal seam.
煤层气在煤层中的流动是孔隙中扩散和裂隙中渗流的综合过程，研究二者之间的质交换关系，对开发低透气性煤层的煤层气具有指导意义。
Rill cut and fill method Application of low caving coal hydraulic support in thick coal seam with large tilt angle
倾斜分层充填采煤法低位放顶煤液压支架在大倾角厚煤层中的应用
Geological data show that the main coal layer (B2)`s storage area is 473.031km2, the depths of coal seam is between 1150~2050m, the thick of coal is between 5.32~8.15m, average about 6.0m, the lean coal with the value of high fever, low ash, special low sulfur, low phosphorus, higher temperature to soften the ash and medium can wear on the 3rd of anthracite, the heat is 6854~7177 kcal/kg, it can be used for power and civilian.
地质资料表明，该区主要可采煤层二2煤赋存面积473.031km2，煤层埋深1150—2050m ，煤厚5.32—8.15m ，平均6.0m 左右，煤质为高热值、低灰、特低硫、低磷、较高软化温度灰、中等可磨性无烟煤三号，发热量6854-7177kcal/kg ，可作动力用煤和民用煤。
Geological Characteristics and New Development Progress of Low Rank Seam Coal Bed Methane in China
我国低煤阶煤层气地质特征及最新进展