main roof

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。

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。

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

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。

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

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

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

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；

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

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

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

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

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