Mechanism analysis of overburden rock damage law and disaster caused by sudden water surge of thick coal seams

doi:10.16265/j.cnki.issn1003-3033.2025.S2.0033

Abstract

Abstract:

In order to accurately grasp the possibility of disaster caused by sudden water surge within the 2-coal mining range of the I04 mining area of Hongliu Mine, the stability of the overburden rock and the breakage law of the working face were analyzed based on the key layer theory, and a probing study was conducted on the height of the ″two zones″ of the I040201 comprehensive mining face by using the borehole peeping method, the segmented water injection method, and the numerical simulation method. The results show that the height of the collapse zone of I040201 comprehensive mining face in Hongliu Mine is about 54.40 m, and the height of the fissure zone is about 98.12 m; the collapse ratio of 2-coal in I04 mining area is 10.46, and the fissure ratio of 2-coal in I04 mining area is 18.87; the destruction of overburden caused by the mining of the face has not penetrated the aquifer of Anding Formation. The test results provide theoretical support and scientific basis for the management of the roof plate in the open area of Hongliu Mine, the setting of waterproof coal pillars, as well as the deployment of mining and roadway support.

Key words: overburden rock damage, disaster caused by sudden water surge, ″two zones″ of roof plate, segmented water injection, numerical simulation

CLC Number:

X936

GUO Weiqiang, LAN Tianwei, LU Kaixiang, LI Zhu, YAO Xinyu, FENG Wei. Mechanism analysis of overburden rock damage law and disaster caused by sudden water surge of thick coal seams[J]. China Safety Science Journal, 2025, 35(S2): 110-117.

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岩层	岩性	层厚h/m	关键层
1	粗粒砂岩	32.17	次关键层1
2	泥岩	14.00	—
3	中粒砂岩	23.80	次关键层2
4	泥岩	27.30	—
5	中粒砂岩	30.70	次关键层3

回采距离/ m	导水断裂带发育规律
回采距离/ m	发育特征	发育高度/m
10	直接顶垮落,基本顶稳定, 导水断裂带未发育	0
30	基本顶破断,导水断裂带向上发育至第2层(泥岩)	32.17
50	导水断裂带向上发育至第3层(中粒砂岩)	46.17
100	导水断裂带向上发育至第4层(泥岩)	69.97
200	导水断裂带向上发育至第5层 (中粒砂岩),并趋于稳定	97.27

孔号	名称	方位角/ (°)	仰角/ (°)	垂高/ m	平距/ m	孔深/ m
1号	对比测孔	330	55	100	70	122
2号	垮落带测孔	145	29	60	108	123
3号	垮落带测孔	150	35	60	86	105
3'号	裂隙延长孔	150	35	40	57	69
4号	垮落带测孔	155	32	60	88	114
5号	断裂带测孔	160	50	100	100	144
6号	断裂带测孔	170	50	100	100	144

钻孔编号	垮落带高度/m
钻孔编号	测试结果	修正结果
2号	>45	>48
3号	<57	<59
4号	>52	>57
平均值	54.5	58

煤岩层名称	密度/(kg·m^-3)	体积模量/GPa	剪切模量/GPa	黏聚力/MPa	内摩擦角/(°)	抗拉强度/MPa
煤	1 500.00	1.67	1.26	2.20	35	0.52
粗粒砂岩	2 138.65	8.06	6.30	1.24	32	3.43
泥岩	2 084.61	2.03	1.44	1.05	29	0.73
中粒砂岩	2 221.80	8.33	5.44	2.05	51	4.39
泥岩	2 046.90	1.94	1.52	1.04	30	0.69