厚煤层疏水风化损伤规律及微爆破治理片帮技术

Drainage-weathering damage rule of thick coal seam and micro-blasting control technology of coal wall rib spalling

为解决朱仙庄煤矿富水厚煤层疏水风化后煤壁片帮严重问题,采用数值模拟、理论分析、现场实测等方法,分析了疏水及风化作用下煤岩体损伤机制,研究了疏水厚煤层煤壁片帮发育过程、影响因素及控制机理,提出了微爆破治理片帮技术。研究表明:疏水及持续通风条件下煤岩体发生物理化学作用,其强度、摩擦力和黏聚力降低,竖向裂隙等发育丰富;煤壁片帮受到疏水煤体内裂隙和残存导水通道、煤岩体应力、采动损伤、开采空间和停采时间等因素的影响;认为微爆破通过建立裂隙纵横网络结构、增强块体间黏聚力和摩擦力、改善煤壁应力环境等路径有效改善片帮发生,提出了具体工艺参数并应用在880工作面,有效实现对疏水厚煤层煤壁片帮的控制。

In order to solve the serious problem of coal wall rib spalling in water-rich thick coal seams in Zhuxianzhuang Coal Mine after being drained and weathered,the methods such as numerical simulation,theoretical analysis and field measurement were used to analyze the damage mechanism of coal-rock mass of being drained and weathered.In this paper,the development process,influencing factors and control mechanism of coal wall rib spalling in drainage thick coal seam were studied,and the micro-blasting technology was put forward to control spalling.The research shows that under the condition of drainage and continuous ventilation,the coal-rock mass undergoes physical and chemical effects,its strength,friction and cohesion decrease,and vertical fissures are abundant.The coal wall rib spalling is affected by the fissures and residual waterconducting channels in the coal mass,the stress of the coal-rock mass,the influence of mining,the mining space and the stop mining time.It is believed that micro-blasting can effectively improve the occurrence of coal wall rib spalling by establishing the network structure of cracks,enhancing the cohesion and friction between blocks,and improving the stress environment of coal wall.The specific technological parameters are put forward and applied to 880 working face,which can effectively control the coal wall rib spalling of thick coal seam with drain.