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Design principles and key technologies of gob side entry retaining by roof pre-fracturing

机译：屋顶挡泥板预压缩饲料扶手侧进入的设计原理及关键技术

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摘要

This study investigates gob side entry retaining by means of roof pre-fracturing. Based on short cantilever beam theory, the entry roof was pre-fractured from gob roof via orientated blasting. The gob gangue was then blocked and used as one side wall of the retained entry. The blasting hole length relied on site geological conditions, and a design method was formulated. Yieldable cable bolt anchored into stable overlaying strata is one key technique to stabilise the entry roof under double dynamic pressure. For the gangue management I-steel and retractable U-steel formed frameworks were investigated with regards to varying seam thicknesses. A real-time remote monitoring system was developed and used to investigate surrounding rock mass deformation of the proposed retaining method and to provide early warning for mining safety. We present two working cases to show the applicability of the retaining method under different geological conditions. Field monitoring reveals that the periodic weighting loads decreased at the working face after roof blasting. The entry roof and gangue wall became stable after the working face passed a certain distance. Our proposed mining method provides an innovative approach for mining safety and economy.
机译：本研究通过屋顶预压，调查了GOB侧进入保留。基于短悬臂梁理论，进入屋顶通过定向爆破从GOB屋顶预裂缝。然后堵塞了GOB矸石并用作保留条目的一个侧壁。爆破孔长度依赖于现场地质条件，并配制设计方法。锚固到稳定的覆盖层中的可产生的电缆螺栓是一种稳定进入屋顶在双动压力下的一种关键技术。对于煤矸石管理，关于不同的接缝厚度，研究了I钢和可伸缩的U型钢形成框架。开发了一个实时远程监控系统，用于研究所提出的保留方法的周围岩体质量变形，并为采矿安全提供预警。我们提出了两个职业案例，以显示保留方法在不同地质条件下的适用性。现场监测显示，在屋顶爆破后的工作面上的周期性加权负荷降低。工作面通过一定距离后，入口屋顶和钻石墙变得稳定。我们拟议的采矿方法为采矿安全和经济提供了一种创新方法。

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