带压开采煤层底板破坏特征与突水风险分析

doi:10.16265/j.cnki.issn1003-3033.2022.05.1535

摘要/Abstract

摘要：

为弄清采动条件下底板破坏特征,以辛置煤矿10409工作面为研究对象,采用理论分析和数值模拟相结合的研究方法,详细研究采动过程中底板应力场分布特征和底板岩层破坏损伤演化特征,结合现场压水试验验证结果,得出采动条件下煤层底板岩层中支承压力分布规律和底板岩层破坏范围,并分析评价矿井10号煤层带压开采风险。结果表明:采动影响下煤层底板呈现拉张破坏-压实-拉张破坏的周期性破坏,影响底板破坏深度的工作面长度临界值约为160 m;底板岩层最大破坏深度可达9.50 m,底板突水最大风险点滞后工作面2.6 m左右。

关键词: 带压开采, 底板破坏, 突水风险, 理论计算, 数值模拟, 压水试验

Abstract:

In order to study characteristics of floor failure under mining conditions, with working face 10409 of Xinzhi Coal Mine as a research object, distribution characteristics of floor stress field and damage evolution of floor strata were studied in detail by using a combination of theoretical analysis and numerical simulation methods. Then, based on verification results of on-site pressurized water test, distribution law of bearing pressure in coal seam floor strata and damage range of floor strata during mining process were obtained. Finally, mining risks of No. 10 coal seam under pressure was analyzed and evaluated. The results show that under influence of mining, the floor of coal seam presents periodic failure of tension failure-compaction-tension failure, and the critical value of working face length that affects failure depth of floors is about 160 m. The maximum failure depth of floor strata can reach 9.50 m, while maximum water inrush risk point lag behind working face is about 2.6 m.

Key words: pressurized coal mining, floor failure, water inrush risk, theoretical calculation, numerical simulation, pressurized water test

李刚, 刘海振, 杨庆贺, 牛伟锋. 带压开采煤层底板破坏特征与突水风险分析[J]. 中国安全科学学报, 2022, 32(5): 68-76.

LI Gang, LIU Haizhen, YANG Qinghe, NIU Weifeng. Analysis on failure characteristics of coal seam floors and water inrush risks in mining under pressure[J]. China Safety Science Journal, 2022, 32(5): 68-76.

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参考文献 13

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岩层名称	体积模量/ GPa	剪切模量/ GPa	黏聚力/ MPa	内摩擦角/ (°)	抗拉强度/ MPa
细砂岩	4.8	3.1	4.2	41	1
煤层	1.9	0.95	1.2	35.1	0.429
砂质泥岩	2.2	1.152	1.5	32.5	0.586
泥岩	1.8	1.02	1.2	31.6	0.612
铝土泥岩	1.9	0.95	1.0	36	0.429
砂岩	3.5	2.12	4.3	43	1.618
页岩	1.8	0.86	1.2	37	0.303
石灰岩	5.6	3.89	5.7	42.5	0.48

孔号及特征	测试深度/m	K₁/(m·d^-1)	K₂/(m·d^-1)	K₂/ K₁	ΔK/(m·d^-1)
3号孔单栓塞压水	(7.51,12.37)	13.87	16.43	1.184 092	2.554 655
3号孔双栓塞压水	(8.98,9.03)	2.112	50.36	23.833 33	48.224
3号孔双栓塞压水	(9.45,9.50)	2.64	56.72	21.484 85	54.08
3号孔双栓塞压水	(9.96,10)	282.74	320.32	1.132 898	37.576
3号孔双栓塞压水	(10.94,11)	97.5	109.64	1.124 549	12.144

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