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- Complex coal seam roof and floor conditions made stope support system low stiffness,poor stability and a very adverse the exploitation environment. 复杂的煤层顶底板条件使得采场支护系统刚度低、稳定性差,开采环境十分恶劣。
- Water channels include coal seam roof and floor mining induced fissures,faults,karstic subsided columns,Quaternary scuttles,fissure concentrated zones and badly sealed boreholes. 充水通道包括顶底板采动裂隙、断层、岩溶陷落柱、第四系天窗、裂隙密集带及封闭不良钻孔等,其中顶底板采动裂隙、断层、岩溶陷落柱为主要导水通道。
- Taking a certain coal mine in North China for example in this paper,two different water quality types of mine inflows from coal seam roof and floor aquifers have been effectively identified by applying Adaline method. 本文以华北某矿井为例 ,采用具有线性功能函数的神经元 (AdaptiveLinearElement)方法对来自煤层顶、底板含水层的两种不同水质类型矿井水进行了有效的识别。
- coal seam roof and floor 煤层顶底板
- The coal seam of No. 5102 face in Wuyang coal mine is steep, soft, and undulate.Aiming at this problem, the displacement and stress of top coal, roof and floor were researched by using UDEC software. 摘要针对五阳煤矿5102工作面倾角大、煤层松软、煤层起伏大、综放开采的条件，利用UDEC数值模拟软件分别通过沿工作面走向和倾向剖面建立模型，对顶板（煤）、底板的位移和应力变化进行了研究。
- 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。
- In the process of Shanxi formation seam mining in Shaqu Colliery,the seam roof and floor sandrock aquifers constitute the direct discharge aquifers. 沙曲煤矿山西组煤层开采过程中,煤层顶底板砂岩含水层构成煤层开采时的直接充水含水层。
- Roof and floor of coal seam 煤层顶底板
- Applying of Anchor Wire Support under the Conditions of Coal Seam Roof and Broken Rock Roof 锚索支护在煤层顶板和破碎岩石顶板条件下的应用
- 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。
- seam roof and floor fracturing 顶底板断裂
- It was discovered that the gallium is more than marginal grade in content and enriched in lower coal seam and floor, and occurs mainly in diaspore. 发现样品中镓的加权平均含量超过边界品位，并在煤层下部和底板岩石中显著富集，其主要地质载体为硬水铝石。
- It is considered that the roof and floor of seam 5 are in poorer steadines,where mudstone prevails,and the roof and floor of seam 6 in better steadiness,where sandstone dominates. 5煤顶底板以泥岩分布最广，6煤顶底板砂岩、粉砂岩和泥岩均有较大分布。砂岩稳定性较好，粉砂岩次之，泥岩较差。
- mining at seam roof and seam floor 顶板层底板层同采
- Study on top coal caving below roof and floor in steep seam 急倾斜顶底板处顶煤放出规律研究
- Prevention Coal Seam Roof Water In Using Gradient Axis Double Joint 向斜轴部双机联运防治煤层顶板水
- APPLICATION： Suitable for heavy machinery plant, chemical storagetank water through electrolysis pool roof and floor against cracking. 合用范围：重型机器厂、化工储罐、水槽、电解池、屋顶、楼板、防皲裂地面等。
- The principle of WKS in water-preserved mining has been successfully applied to the disaster prevention of water inrush from roof and floor in working face. 保水采煤的隔水关键层原理在采场顶底板突水灾害防治中得到了成功应用。
- That the water filling into vertical fractures can only cause redistribution of stress of surrounding rock along strike of the tunnel, without any effect on roof and floor. 单一垂直充填裂隙进水，只会引起巷道走向方向上围岩应力的重新分布，对顶底板不会产生较大的影响；
- A Case Study of Rock Failure and Water Inrush from the Coal Seam Roof 煤层顶板破坏与突水实例研究
