roof coal

According to the tested mechanical performance of coal sample, the plastic softening process of stress-strain curve is thought to be about a cubic curve, and the plastic softening theory about coal layer is used to deduce the inflection equation of roof.

根据煤样力学性能测试结果，把煤柱应力应变曲线的塑性软化阶段近似为三次曲线，应用煤层塑性软化理论，推导出了顶板弯曲方程。

Investigation to the tectonite roof of the coal seam for the stability

煤层构造岩顶板稳定性初探

It is pointed out that the law of main roof beak in top caving in steep and thick seam initially occur at the middle of exposed main roof surface and expand along the face advancing direction which is different from it in gently inclined coal seam.

指出急斜特厚煤层放顶煤开采顶板破断不同于缓倾斜煤层顶板破坏规律，破坏首先在顶板裸露面中部开始，沿工作面推进方向发展。

The Application of Fully-mechanized Roadheader Equipped Temporary Roof Supporting Device in Coal Mine

综掘机载式临时护顶装置在煤矿的应用

Application of Unload Roof Coal Technology with Lightweight Hydraulic Support

轻型液压支架放顶煤技术的应用

By observing and testing the changing laws of the prop load, the moving laws of roof ( or top coal) were analysed and studied, and the safety management basis was provided for managers and workers in-situ.

利用放炮前后支柱载荷变化规律，研究分析了顶板（顶煤）活动规律，为现场工作人员提供了安全管理的依据。

Mechanical model for the elastic thick outrigger of roof coal is set up.

建立了顶煤弹性深梁力学模型,分析了顶煤应力分布及顶煤破坏形式.

Accuracy of measurement of roof coal thickness by natural γ-ray sensor

天然γ射线顶板煤厚传感器的测量精度

Dedusting mechanism by water-cloud of wetting agents and the relevant tests for fully-mechanized and roof caving coal face Don't put the unit in extremely hot or moist place.

综放工作面湿润剂喷雾降尘机理及高效降尘湿润剂的试验不要把话机故意放到温度高的或潮湿的地方。

Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

分析了放顶煤开采顶煤冒放性的影响因素.

Development of the transition support for roof coal working surface in comprehensive mechanized coal mining

综采放顶煤工作面过渡支架的研制

From the control angle of roof stability in face area, UDEC program has been used in analysis of the relationship between the roof stability in face area, the working resistance of support and the distance to face under different top coal conditions.

从端面顶板稳定性控制角度出发，应用数值模拟离散元法分析了不同顶煤条件下端面顶板稳定性与支架工作阻力及端面距的关系。

The movement rule of top roof and top coal is very complex in the mining of deeply inclined thick coal seam.

在急倾斜煤层放顶煤开采过程中，顶煤和顶板的活动规律是非常复杂的。

The Technology Study of Roof Coal Presplitting in Thick Seam Caving Coal Mining

厚煤层放顶煤开采顶煤预裂技术研究

Research on Design on Powered Support for Thick Seam Mining with Soft Roof, Coal and Floor

三软厚煤层液压支架设计研究