immediate roof

according to stratum quality index, this paper established classification norms of immediate roof and main roof.

本文依据岩层质量指数，建立了直接顶和老顶的分类准则；

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Simulation testing and theoretical analysis were made to study generating mechanics and moving evolutionary process of "granular arch" structure of upper immediate roof in top coal caving.

通过相似模拟实验和理论分析，研究了综放条件下上位直接顶“散体拱”结构的形成机理和移动演化过程。

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although the immediate roof of baidong colliery is relatively soft, its basic roof is glutenite and difficult to control.

白洞煤矿采场顶板中虽然直接顶较松软，但基本顶岩层为砂砾岩，属于难控顶板。

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since lump size of upper-immediate roof is large, a semi-arch equilibrium structure of the stratum-rock sometimes can be formed.

上位直接顶岩块强度较高、块度较大，容易形成“岩-矸”半拱式平衡结构。

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The outport bears the load of top-coal and breaks immediate roof.

支架承受的是上方煤体和折断部分直接顶的载荷.

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the balance structure of main roof and its action to immediate roof in large cutting height workface

大采高开采上位岩层平衡结构及其对采场矿压显现的影响

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influence of cycle caved height of immediate roof on stability of its first layer

直接顶循环垮落高度对其第一分层稳定性的影响

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critical height of immediate roof and working resistance of support

直接顶的临界高度与支架工作阻力分析

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modelling experiment for immediate roof with many cracks caving in longwall face

采场多裂隙直接顶破坏的模拟研究

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first of all, based on the field analysis of very soft coal fully mechanized face immediate roof and the movement of top coal.

首先，根据现场实际分析极松软煤层综放工作面直接顶和顶煤的运动形式；

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stability monitoring of immediate roof in fully-mechanized top-coal caving face with high output and high efficiency

高产高效综放工作面直接顶稳定性监测

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immediate roof type ii is not suitable for large mining-height technique.

II型直接顶暂不宜采用大采高开采技术；

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