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- roof of coal seam 煤层顶板
- The coal seam tunnel of compound mudstone roof of large span is the tunnel that is violent out of shape,roof is easy falling and safeguard is very difficult. 大跨度复合泥岩顶板煤层巷道是围岩变形剧烈且顶板易冒落、极难维护的巷道。
- Keywords microseism;monitor;roof of coal seams;caving zone;fractured zone; 微地震;监测;煤层顶板;冒落带;裂隙带;
- The test results show that the drawing interval of 1.5 m is helpful for controlling dead-unconsolidated thin sandstone of coal seam roof and reduce sand ratio of drawn top-coal. 试验结果表明,放煤步距采用三采一放有利于控制顶板极松散细砂岩,降低放出顶煤的含砂率。
- From the characteristic of prop and actual conditions of coal seam and roof in Datai pithead, the support force of the dense prop in 揝ichuan Method?is calculated. 从单体液压支柱的特性出发,结合大台井实际的煤层和顶板条件,计算了俯伪斜走向分段密集采煤法密集柱的支撑力。
- The hardness and thickness of coal seam play a great role in the vertical distribution of stress in coal and the occurrence of rock bunt under the condition of hard roof and hard floor. 在“两硬”条件下,煤层厚度与硬度的变化对煤体中的应力分布有着很大的影响,从而对煤岩体系统中冲击矿压的发生有着很大的影响。
- The rock mass structure can be expressed by rock stratum effect thickness influence coefficient. It is more scientific then using roof rock and sand content in the study of coal seam gas preservation. 研究表明,煤层围岩岩体结构控制了煤层瓦斯的赋存,岩体结构可用岩层效应厚度影响系数来表示,应用这一参数研究煤层瓦斯赋存比用煤层顶板岩性及含砂率更科学。
- The stone made a dent in the roof of my car. 我的汽车顶让石头砸了个坑。
- The roof of our house is covered by shingles. 我家的屋顶是用木瓦铺的。
- Research on coal bedding structure is the theory foundation and precondition of coal seam gas exploitation. 煤体层理结构的研究是煤层气开发开采的理论基础和前提条件。
- The authors used the Analytic Hierarchy Process(AHP) in the researches of coal seam floor water-irruption. 将系统工程中的层次分析法引入煤层底板突水的研究中。
- The reserves of thin coal seam shearer and the developing trend of coal seam shearer of our country are analysed. 分析我国薄煤层储量以及薄煤层采煤机的发展状况及趋势。
- The roof of the house pitched at a 45°angle. 屋顶倾斜四十五度。
- Exploration evaluation coal seam gas is a base of coal seam gas exploration and developing. 煤层气的勘探评价,是开展煤层气勘探与开发工作的基础。
- The roof of the old house caved in. 那栋旧房子的屋顶塌下了。
- The roof of the schoolhouse is covered with snow. 校舍的屋顶上覆盖着积雪。
- On the roof of coal bed are consists of the mudstones in dark-gray or grizzle which will expand met water and wet air, with higher expansion stress and coefficient. 煤层顶板为深灰色和灰色泥岩,该岩石遇水和潮湿空气产生膨胀,膨胀应力和膨胀率大。
- We heard the rain spattering down on the roof of the hut. 我们听到雨滴滴答答打在小屋的顶上。
- An inversive research method was proposed through analyzing the complicated changing features of permeability of coal seam and the problems existing in actual measurement. 分析了煤层渗透率的复杂变化特点和实际测量上存在的问题,提出其反演方法。