山东煤炭科技2024，Vol.42Issue(3)：68-72,88,6.DOI:10.3969/j.issn.1005-2801.2024.03.015
230905工作面坚硬顶板深孔预裂爆破效果分析
Analysis of the Effect of Deep Hole Presplitting Blasting on the Hard Roof of the 230905 Working Face
郭林1
作者信息
- 1. 中煤新集能源股份有限公司新集一矿,安徽 淮南 232000
- 折叠
摘要
Abstract
Taking the 230905 working face of Xinji No.1 Mine as the engineering background,there is a hard roof with high strength and large thickness,which makes it difficult for the roof to collapse.Numerical simulation,on-site testing and other methods are used to analyze the evolution law of the overlying rock stress field and the characteristics of plastic zone failure during the advancement of the working face after roof presplitting blasting.A fan-shaped hole layout method is proposed to solve the problem that the hard roof is difficult to fall off by manually presplitting and roof caving.The results show that after presplitting blasting,the stress peak value in front of the coal wall is reduced,and stress concentration is formed at the uncut top in front.The rock layer above the goaf is mainly subjected to tensile-shear failure.Combined with the characteristics of the roof failure modality,a deep hole presplitting blasting scheme is developed to quantitatively analyze the stability of the support in the working face,providing a basis for the support in the advancing process of the subsequent working face.关键词
坚硬/顶板/爆破/矿压Key words
hard/roof/blasting/mine pressure分类
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郭林..230905工作面坚硬顶板深孔预裂爆破效果分析[J].山东煤炭科技,2024,42(3):68-72,88,6.
