roof sinking

According to the global m echanical m odel of support resistance, im m ediate roof subsidence and surrounding rocks, the im m ediate roofis considered as a deform able body, and the hyperbolicrelation is the- oretically proved from pointview ofenergy.

将直接顶视为可变形体， 根据支架围岩关系的整体力学模型， 从能量角度出发， 证明了支架工作阻力与顶板下沉量存在类双曲线关系， 并进一步探讨了直接顶高度、直接顶坚硬程度或损伤程度对此类双曲线关系的影响， 其结果对现场支护设计有重要的指导意义。

Evolvement rules of the roof control and crack field in working face;

顶板防治与回采工作面裂隙场演化规律

Stability Analysis on the Roofs of Mined-out Area with Different Spans in Jiagou Mine;

夹沟矿不同跨度采空区顶板的稳定性分析研究

Analysis on Critical Roof Thickness of Mined-out Area in Jiaguo Mine;

夹沟矿采空区顶板的临界安全厚度分析

Discussion about roof control technology development of China in future;

对我国今后顶板控制技术发展的探讨

The roof control technology of combined machinery island face in Jining No.2 Coal Mine;

济宁二号煤矿综放孤岛工作面的顶板控制技术

With the conventional roof control measures,the soft rock is not only easy to make a accident,but will have a high ash content to the coal products.

复合顶板下层软岩极易失稳,按常规的顶板控制措施开采不仅易发生安全事故,而且开采出的煤含矸率高,应用岩石破断分析系统(RFPA2D),通过数值模拟总结出复合顶板离层、冒落、垮落的特征和规律,从原煤生产的源头上采取切实有效的措施,以合理的顶板支护方式与回采工艺,确定出合理的开采层位,不断降低煤炭资源的含矸率及灰分,实现煤炭清洁生产。

Roof control and practices on coal mining under complex roof;

复合顶板下采煤的顶板控制与实践

Numerical analysis on rational support for complex roof of coal mining face in No.3 seam of Liuquan Mine;

柳泉煤矿3煤工作面复合顶板合理支护方式数值分析

Technical analysis and prevention of roadway roof-fall accident under conditions of complex roof;

复合顶板条件下巷道冒顶事故技术分析及预防

Design and application of horizontal long borehole for gas drainage in seam roof;

煤层顶板瓦斯抽放水平长钻孔的设计与应用

There are 6 types of REEs in coals and seam roofs: water\|soluble state (Ⅰ), ion\|exchangeable state(Ⅱ), carbonate state(Ⅲ), organism\|bonded state(Ⅳ), sialic state(Ⅴ),and sulfide state(Ⅵ).

在煤层顶板中 ,以硅铝化合物和硫化物结合态的稀土元素含量随着原子序数的增加而减少 ,以有机质结合态的稀土元素随着原子序数的增加而增加 ,且和煤层中稀土元素的赋存状态不同 ,表明不同沉积环境以及相同沉积环境对不同物质中的稀土元素的分馏效应是不同的 。