Study on rock burst danger and double entry inward layout optimization for rock burst prevention under condition of inclined thick coal seam

doi:10.16265/j.cnki.issn1003-3033.2026.04.0878

Abstract

Abstract:

Based on the engineering geological conditions of a coal mine in western China, this research focuses on addressing the challenges associated with rock burst prevention in working face of inclined thick coal seams. Theoretical analysis, mechanical modeling, numerical simulation, and field monitoring were employed to analyze the influencing factors and hazardous areas of rock burst in working face of an inclined thick coal seam. Optimization strategies for double entry inward layout were proposed and subsequently validated through engineering application. It is found that the occurrence of rock burst is influenced by several factors including buried depth, thick-hard roof, coal seam dip angle, coal pillars, bottom coal. The belt and track roadways were identified as zones with strong rock burst danger, while the setup entry was categorized as a zone with moderate rock burst danger. Based on an analysis of roof structure evolution and floor stress calculations, the floor was divided into three low-stress zones: the semi-protected zone beneath key blocks (I), the protected zone beneath key blocks (Ⅱ), and the stress release zone of gangue (Ⅲ). Numerical simulations determined that the optimal positioning was within the protected zone beneath key blocks (Ⅱ), specifically at a horizontal distance of 5.15 m from the right of the track roadway and a vertical distance of 3 m from the goaf. Microseismic and pressure monitoring demonstrated that implementing the double entry inward layout transformed the energy release pattern of the surrounding rock from "low-frequency and high-energy" to "high-frequency and low-energy". Furthermore, the duration of continuous pressure was significantly reduced, thereby mitigating the rock burst danger in the working face.

Key words: inclined thick coal seam, rock burst danger, double entry inward layout, floor stress, prevention effect of rock burst

CLC Number:

X936

Lyu Pengfei, Wang Yongliang, Liang Ye, Qi Yun, Geng Yijian, Sun Yuting. Study on rock burst danger and double entry inward layout optimization for rock burst prevention under condition of inclined thick coal seam[J]. China Safety Science Journal, 2026, 36(4): 132-141.

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影响因素	原则	影响等级
埋深h:550 m	400<h≤600	弱
倾角:30°	大于15°	弱
顶板特征:82.35	大于50	强
冲击倾向性	煤层,顶底板	弱
煤柱	胶带巷	强
底煤厚度胶带巷1.7 m 轨道巷1.7 m	底煤厚度1~2 m	中等
底煤厚度胶带巷1.7 m 轨道巷1.7 m	底煤厚度2 m	强

岩石类型	细砂岩	粗砂岩	泥岩	5煤	细砂岩
密度/(kg/m³)	2 645	2 650	2 496	1 550	2 645
体积模量/GPa	12.6	5.6	1.6	4.2	13
剪切模量/GPa	9.5	4.6	2.2	6.4	9.5
黏聚力/MPa	7.8	6.6	3.2	1.2	7.8
抗拉强度/MPa	6.75	1.8	0.9	1.1	6.75
内摩擦角/(°)	32	44	41	38	32