Fracture development and evolution features of fractured roof in Xindeng mine and zoned support technology

doi:10.16265/j.cnki.issn1003-3033.2025.08.1713

Abstract

Abstract:

To solve the challenges in supporting fractured roof coal seam roadways, a rock layer detection recorder was used to conduct tests on the coal seam roadways at Xindeng mine. The analysis focused on the evolution characteristics of surrounding rock fractures. The R value for the direct roof rock and the β coefficient for roof fragmentation were introduced as evaluation indicators for roadway surrounding rock stability. The surrounding rock was categorized into four types: easy to support, relatively easy to support, relatively difficult to support, and difficult to support. Specific support parameters were provided for each category. Zoned support technology was applied in the gas drainage chamber of +90 North wing of Xindeng mine, achieving excellent support results. The study shows that the state of the roof surrounding rock is zoned, with the shallow fractured zone, followed by the fractured-fracture mixed zone, the developed fracture zone, and the intact surrounding rock zone. Through fracture analysis, it is found that the width of the roof fracture zone gradually expands to the deep surrounding rock over time, and the number of fractures also increases. The existing support cannot effectively control the continuous deterioration of the surrounding rock integrity.

Key words: fractured roof, borehole peeping, fracture development, zoned support, coal seam roadway

CLC Number:

X936

CHEN Ying, BAO Shiji, SHI Mingzhe, YANG Hongtao, ZHANG Zikai. Fracture development and evolution features of fractured roof in Xindeng mine and zoned support technology[J]. China Safety Science Journal, 2025, 35(8): 100-109.

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测试巷道	窥视时间	E/m	a	ΣW_i/m	RFD/%
22051 副巷	第1次	3.5	9	0.342	9.7
22051 副巷	第2次	4.3	12	0.541	12.6
22051 机巷	第1次	4.7	11	0.531	11.3
22051 机巷	第2次	5.8	16	0.836	14.4
22031进风绕巷	第1次	4.1	10	0.521	12.7
22031进风绕巷	第2次	6.8	23	1.202	17.7

直接顶岩性	砂岩	泥岩	煤层
R	R_Ⅰ	R_Ⅱ	R_Ⅲ
顶板强度类别	高	中	低

围岩类别	支护难度分区	参考指标
1	容易	R_Ⅰβ_Ⅰ、R_Ⅰβ_Ⅱ
2	较容易	R_Ⅰβ_Ⅲ、R_Ⅱβ_Ⅰ
3	较难	R_Ⅱβ_Ⅱ、R_Ⅲβ_Ⅰ
4	困难	R_Ⅱβ_Ⅲ、R_Ⅲβ_Ⅱ、R_Ⅲβ_Ⅲ