roof rock

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 numerical model of roof bolting and rock was based on Hoek Brown's strength criterion.

基于虎克-布朗强度准则给出了岩体及顶板锚固的数值模型.

On the premise of the stability of roof and top coal, the displacement regularity of surrounding rock must be rationally used to determine the reasonable filling pattern and filling strength in order to ensure the filling stability and a good result of retaining roadway.

当采用综放沿空留巷时，在保证顶煤及顶板稳定前提下，合理利用围岩移动规律，确定合理充填方式和充填体强度，就能保证充填体稳定，达到很好的留巷效果。

One of the crucial elements influencing the rock burst is the structure of roof rock stratum, especially the flinty and thick sandstone roof over the coal seam.

顶板岩层结构，特别是煤层上方坚硬、厚层砂岩顶板是影响冲击矿压发生的主要因素之一。

The roof collapsed in a roar of rock and rubble

屋顶轰隆一声塌了下来，碎石瓦砾落了一地。

The main factors effecting of slipping area along the bed rock and roof separation and failure area and the major avenue of damage surrounding rock caused by mining are analyzed in this paper.

分析了影响沿底座滑区和顶板离层破坏区破坏的主要因素及其采动损害传递的主途径。

The destroy of the roof produced by stress wave of upward hole side blasting is less than that of the level hole blasting. The work of prizing flexible rock decreased by 58. 3%.

上向孔侧向崩矿爆炸应力波对采场项板的破坏比水平落矿爆炸应力波对采场顶板的破坏要小，从而使撬毛工作量减少了58.3%。

Because of a mass of magmatic rock intrusion, rock crevice water existing, broken roof and broken floor, the environment which is useful to gas loss generates.

而大量的岩浆岩的侵入，岩溶裂隙水的存在以及破碎的顶底板，均形成了有利于瓦斯释放的环境。

In Fully Mechanized Caving, the motion of the cover roof and its rock pressure phenomenon is comparatively violent for the greatly thickness extracted of coal seam in one time.

综放开采法一次采出厚度大，工作面顶板运动及其矿压显现也相对剧烈。

New Technique of Gas Drainage by Long Horizontal Roof Rock Hole

顶板岩层水平长钻孔抽放瓦斯新技术

The caving of thick and strong roof stratum, key stratum, causes tremendous rock pressure in mine.

采场上覆岩层中的厚硬岩层, 即厚硬关键层, 其冒落会造成剧烈的矿山压力显现.

The s detecting structure instrument of the roof rock is integrated in the pneumatic bolt drill and data processing is adopted BP algorithm of mature net to identify the structure.

其中，顶板岩层结构探测仪是集成在风动锚杆钻机上，数据处理采用训练成熟的BP算法神经网络进行结构的识别；