摘要
木瓜矿S10-201工作面初采时存在坚硬直接顶灰岩长时间、长距离的悬顶问题。以现场地质资料为依据,构建坚硬顶板工作面初采阶段坚硬顶板卸压前后力学模型,发现顶板定向预裂切缝爆破技术非常有利于坚硬灰岩的初采垮落,给出S10-201工作面初采卸压的设计参数。现场试验表明:顶板定向预裂切缝爆破技术不仅能有效缩短工作面初次来压步距,降低来压强度,而且可以打破坚硬顶板在垮落时出现的整体性、瞬时性问题;随着工作面的推进,S10-201工作面直接顶坚硬灰岩及时垮落并充满采空区,提前对顶板提供有效的支撑作用,降低了坚硬顶板工作面在初采阶段大面积冒顶事故的发生次数,保障了工作面安全高效的生产。
At the initial mining stage in S10-201 working face of Mugua mine, there is the problem of hard limestone on the direct roof,long time and long distance overhang roof.Based on the field geological data, construction of a mechanical model before and after pressure-relief for a hard roof working face at the initial mining stage can find that thepre-cracking technology is very beneficial to the collapse of hard limestone at the initial mining stage,and it gives the design parameters of roof cutting and pressure-relief with S10-201 working face. The field test shows that the pre-cracking technology can not only shorten the initial pressure step and reduce the pressure strength of the working face, but also destroy the integrity and instantaneity of the hard roof when it collapses. As the advancing working face, the hard limestone directly in the S10-201 working face collapses in time and fills the goaf, providing effective support to the roof in advance, reducing the number of large area caving accidents on the working face at the initial mining stage, and ensuring the safe and efficient production of the working face.
作者
魏红印
马智博
杨东山
李利东
WEI Hong-yin;MA Zhi-bo;YANG Dong-shan;LI Li-dong(Lvliangshan Coal Power Co.,Ltd.,Huozhou Coal and Electricity Group,Lvliang 033100,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Beijing),Beijing 100083.China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《煤炭技术》
CAS
北大核心
2021年第8期18-22,共5页
Coal Technology
基金
国家自然科学基金资助项目(41402273)。
关键词
坚硬顶板
初采
切顶卸压
hard roof
initial mining
roof cutting and pressure-relief
