煤层底板分阶段疏水降压水害防控方法

doi:10.16265/j.cnki.issn1003-3033.2022.S1.0609

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (S1): 145-151.doi: 10.16265/j.cnki.issn1003-3033.2022.S1.0609

煤层底板分阶段疏水降压水害防控方法

马莲净¹(), 赵宝峰²^,³^,^**(), 吕玉广⁴^,⁵

¹ 西安建筑科技大学资源工程学院, 陕西西安 710055
² 中煤科工集团西安研究院有限公司,陕西西安 710054
³ 陕西省煤矿水害防治技术重点实验室, 陕西西安 710177
⁴ 中国矿业大学资源与地球科学学院, 江苏徐州 221116
⁵ 内蒙古上海庙矿业有限责任公司, 内蒙古鄂尔多斯 016299

收稿日期:2022-01-06 修回日期:2022-04-16 出版日期:2022-06-30 发布日期:2022-12-30
通讯作者: 赵宝峰
作者简介:
马莲净 (1986—),女,河北衡水人,博士,高级工程师,主要从事矿山安全与环保方面的研究。E-mail: 860909mlj@163.com。
吕玉广研究员
基金资助:
国家重点研发计划项目(2016YFC0501104); 国家自然科学基金资助(41807221)

Water disaster prevention and control method of coal floor of stepwise water drainage and depressurization

MA Lianjing¹(), ZHAO Baofeng²^,³^,^**(), LYU Yuguang⁴^,⁵

¹ School of Resources Engineering, Xi'an University of Architecture and Technology, Xi'an Shaanxi 710055, China
² Xi'an Research Institute of China Coal Technology & Engineering Group Corp,Xi'an Shaanxi 710054,China
³ Shaanxi Key Laboratory of Coal Mine Water Disaster Prevention and Control Technology,Xi'an Shaanxi 710177,China
⁴ School of Resources and Geosciences, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
⁵ Inner Mongolia Shanghai Temple Mining Co. Ltd., Ordos Inner Mongolia 016299, China

Received:2022-01-06 Revised:2022-04-16 Online:2022-06-30 Published:2022-12-30
Contact: ZHAO Baofeng

摘要/Abstract

摘要：

为有效防控侏罗纪煤田深部煤层底板高承压含水层砂岩水害,基于井田单斜构造特征,利用放水试验与地下水流数值模型,构建一种煤层底板高承压砂岩含水层分阶段疏水降压的水害防控方法。结果表明:煤层底板高承压砂岩含水层采用分阶段疏水降压水害防控方法,可有效避免疏放水钻孔揭露高承压含水层,将含水层水位疏降至安全水位以下,达到理想的水害防控效果。利用单孔和多孔放水试验数据识别和校验地下水流数值模型,并定量预测疏放水量、疏放时间和总疏放水量,可实现煤层底板高承压含水层砂岩水害的精准防控。

关键词: 煤层底板, 分阶段疏水降压, 水害防控, 承压含水层, 突水系数

Abstract:

In order to effectively prevent and control the water disaster from the high confined aquifer below the deep coal floor seam of Jurassic coalfield, based on the inclined structure characteristics of the coalfield, by the dewatering test and numerical model of groundwater flow, a kind of water disaster prevention and control thought for high confined sandstone aquifer below the coal seam was constructed. The research shows that the water disaster prevention and control method of coal floor of stepwise water drainage and depressurization can effectively avoid exposing high confined aquifer by drainage borehole, and reduce the water level of the aquifer to below the safe water level, thus achieving the ideal effect of water disaster prevention and control. The numerical model of groundwater was identified and verified by single and multiple boreholes dewatering test data, and drainage amount, drainage time and total drainage amount of water discharged were predicted quantitatively, so as to realize the precise prevention and control of water disaster from high confined aquifer sandstone aquifer below the coal seam.

Key words: coal floor, stepwise water drainage and depressurization, water disaster prevention and control, confined aquifer, water inrush coefficient

马莲净, 赵宝峰, 吕玉广. 煤层底板分阶段疏水降压水害防控方法[J]. 中国安全科学学报, 2022, 32(S1): 145-151.

MA Lianjing, ZHAO Baofeng, LYU Yuguang. Water disaster prevention and control method of coal floor of stepwise water drainage and depressurization[J]. China Safety Science Journal, 2022, 32(S1): 145-151.

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突水系数P/(MPa·m^-1)	水害危险性分区
<0.06	安全区
0.06<P<0.1	过渡区
>0.1	危险区

层数	含水层	均厚/ m	单位涌水量/ (L·s^-1·m^-1)	渗透系数/ (m·d^-1)
1	新生界	34.04	—	—
2	白垩系	61.53	0.007 1~0.059 7	0.005 5~0.288 3
4	直罗组	43.69	0.010 3~0.120 6	0.023 3~0.281 2
6	煤系间	75.04	0.000 4~0.024 5	0.000 6~0.750 9
8	宝塔山	59.64	0.037 7~1.070 9	0.105 7~2.060 3
9	三叠系	39.69	0.000 5~0.040 6	0.000 7~0.022 1

钻场	1号	2号	3号	4号
高程/m	+880	+913~+918	+771~+776	+750
宝塔山砂岩水位/m	+1 196	+1 190	+1 193	+1 190
带压程度/MPa	3.16	2.72~2.77	4.17~4.22	4.40
疏水降压顺序	1	2	3	4

分阶段疏水降压方案	钻场	水害防控效果	疏放水量/(m³·d^-1)	时间/d	总疏放水量/ (10⁴·m³)
A	1号	未达到	8 000	>730	>584
B	1号+2号	未达到	14 000	>730	>1 022
C	1号+2号+3号	达到	17 000	203	345.1
D	1号+2号+3号+4号	达到	0~96 d:26 000;97~215 d:20 000	215	487.6

煤层底板分阶段疏水降压水害防控方法

Water disaster prevention and control method of coal floor of stepwise water drainage and depressurization

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