Control technology and application of surrounding rock of deep and shallow hole combined blasting roof-cutting retaining roadway

doi:10.16265/j.cnki.issn1003-3033.2022.12.1877

Abstract

Abstract:

In order to solve the stability problem of surrounding rock after roof cutting and retaining roadway in deep sandstone direct-covered working face of Huainan mining area, the technical principle of deep and shallow hole combined blasting roof cutting and retaining roadway was firstly analyzed. The deep hole pre-splitting blasting technology was used to make the main roof break and collapse, and the energy-gathering blasting technology was used to directionally cut the direct roof. Then, according to the theoretical analysis, the scheme of deep and shallow hole combined blasting was determined, and the stress distribution characteristics of three different roof cutting working faces of uncut roof, cut direct roof and deep and shallow hole combined blasting were analyzed by numerical simulation method. Finally, the field study was carried out in 1452 (1) sandstone working face of Dingji mine. The research shows that the surrounding rock control technology of deep-shallow hole combined blasting roof cutting entry retaining can better block the stress transfer between overburden strata and improve the stress environment of entry retaining roof. In the advancing direction of the working face, the periodic weighting step is reduced, and the weighting strength is gentle. In the retaining roadway, the length of the hanging roof above the retaining roadway is reduced to form a short wall beam, which effectively reduces the stress of the surrounding rock of the retaining roadway and better controls the deformation of the surrounding rock.

Key words: deep shallow hole, combined blasting, roof cutting retaining roadway, stability of surrounding rock, control technology

HOU Junling, ZHAO Neng, LI Junbin, DONG Xianzhong, YU Zhonglin, FAN Tongqing. Control technology and application of surrounding rock of deep and shallow hole combined blasting roof-cutting retaining roadway[J]. China Safety Science Journal, 2022, 32(12): 70-78.

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炮孔类型	孔深/m	仰角/(°)	与巷道夹角/(°)	孔径/mm	装药量/kg	封孔长度/m	炮孔间距/m
深孔	42	75	90	94	90	15	5
浅孔	13.5	75	90	50	7.59	3	0.5

工作面	轨道巷道侧煤层
工作面	最大主应力峰值	中间主应力峰值	最小主应力峰值
未切顶	-21.7	-10.5	-10.3
切直接顶	-20.3	-9.6	-8.8
深浅孔联合爆破切顶	-16.4	-7.6	-5.8