roof of coal seam的意思|示意

The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.

前言： 石台煤矿II3123工作面为“三软”煤层轻放工作面，顶板破碎易掉，片帮、冒顶时常发生。

In coal-seam roof, distributary channel sedimentations mostly are vertical accretion, and the continuity of sand body evolvement is well.

顶板分流河道沉积作用以垂向加积作用为主，岩体演化具有较好的继承性；

Roof control is key management of opening up coal seam with potential outburst in crosscut.

顶板管理是石门揭露突出煤层过程中的管理重点。

The stability of seam roof is one of the most important factors that influences the safety of coal extraction.

煤层顶板的稳定性是影响煤层回采工作安全最重要因素之一。

The practices showed that the complex roof of C4 seam was effectively controlled. Therefore the roof control problem of the coal mining face under the complex roof conditions was solved.

实践应用表明，C4煤层复合顶板得到了有效的控制，解决了复合顶板条件下回采工作面的顶板控制问题。

First, based on similar material model test, top coal cave-in characters in steep and thick seam were studied as well as failure law of main roof and features of surface subsiding.

首先利用相似模拟实验研究了急斜特厚煤层顶煤的冒落特征、顶板的破坏规律，以及地表下沉的特点。