main roof

the breaking place prediction of face end main roof flap top in the gob-side entry retaining

工作面端头悬顶在沿空巷道中破断位置的预测

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On this basis the cracked position and inclination of the main roof are determined. The Influence of the Fracture of the Main Roof On the Mining Ground Pressure

从中分析和确定了老顶在回采过程中的断裂位置和可能形成的回转角，以及相关的影响因素。老顶断裂前后的矿山压力变化

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ample overhangs were provided specially on the main roof to protect against the fierce western sun and monsoon rain.

提供了充足的悬在主屋顶特别防止激烈的西部阳光和季风降雨。

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Acoustic emission omen analysis of periodic weighting of the hard main roof

坚硬老顶周期来压声发射前兆分析

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Comprehensive Construction Technology for Ultra Annular Platform Structure of Main Roof in Shanghai Railway South Station

上海铁路南站主站屋特大环形平台结构综合施工技术

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Construction Technology for the Main Roof of Shanghai Railway South Station under the Conditions of Normal Railway Operation

在铁路正常运行环境下的上海铁路南站主站屋相关施工技术

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The Numerical Analysis of the Cracked Position and Inclination of the Main Roof

老顶断裂位置及断裂后回转角的数值分析

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It is pointed out that the law of main roof beak in top caving in steep and thick seam initially occur at the middle of exposed main roof surface and expand along the face advancing direction which is different from it in gently inclined coal seam.

指出急斜特厚煤层放顶煤开采顶板破断不同于缓倾斜煤层顶板破坏规律，破坏首先在顶板裸露面中部开始，沿工作面推进方向发展。

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The breaking place prediction of face end main roof flap top in the gob side entry retaining

工作面端头悬顶在沿空巷道中破断位置的预测

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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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Analysis on bending failure of initial weighting of main roof in longwall face

长壁工作面老顶初次来压的弯曲失稳解析

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Safety Mining Feasibility and Coal Face Support Control under Main Roof of Thick Igneous Rock

厚层岩浆岩老顶下安全回采的可行性及支护控制

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through similar material simulation and computer numerical simulation, the breakage situation and the shape of main roof, the influence of different supports on roof activity and the relevant technique parameters for roadside packing were analyzed preliminarily.

采用相似材料模拟和计算机数值模拟，对沿空留巷老顶破断位置与形状、不同支护方式对顶板活动的影响以及相关的巷旁充填技术参数进行了初步分析。

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Influence of mining height of main roof on broken length The lime-stone rocks bed up against the coal.

采高对浅埋煤层老顶岩层破断距的影响石为岩层紧靠着煤矿层。

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study on plate group mechanical model for main roof of longwall face

长壁工作面采场围岩铰接薄板组力学模型研究

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Based on the damage mechanics, the model of damage base beam is established and the movement of main roof and abutment influenced by break of main roof ahead of workface are analyzed.

基于损伤力学的思想，建立了损伤基础梁的力学模型，并用该模型的结论分析了老顶岩梁超前破断对支承压力及其运动状态的影响。

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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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According to coal wall front force of support and workface support stress movement transformation relations, the main roof cycle pressure can be accurately forecast.

根据工作面煤壁前方支承压力和工作面支架受力之间的运动转化关系，可准确预报工作面老顶的周期来压；

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Time effect of deformation and failure of main roof in the workings

采场老顶变形与破坏的时效特性研究

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The displacement of top coal over the filling is caused by the main roof movement and consists of compression deformation of float coal and filling and residual deformation before bearing of filling.

充填体上方顶煤位移由老顶岩层运动引起，由浮煤和充填体压缩变形以及充填体承载前预留变形量3部分组成；

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