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

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

Abstract

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

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.

Figures/Tables 11

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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