roof rock是什么意思

网络释义

用法例句

The gas management technology of the roof rock boreholes is described as follows:applies the boreholes arranged in the roof,under the action of the drainage pump negative pressure,changes the flow direction in the goaf fall district and crack district,makes it into the wind rodaway,reduces the wind gas amount,controls the corner gas accumulation.

顶板岩石钻孔抽放瓦斯技术,主要是利用布置在煤层顶板中的钻孔,在抽放泵负压作用下,改变采空区冒落带和裂隙带内积存的瓦斯流向,使其直接进入回风巷,减少工作面的风排瓦斯量,控制上隅角瓦斯积聚。

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