海州露天矿采空区地表CO2通量的试验研究

doi:10.16265/j.cnki.issn1003-3033.2022.02.010

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (2): 66-73.doi: 10.16265/j.cnki.issn1003-3033.2022.02.010

海州露天矿采空区地表CO₂通量的试验研究

张晓明¹^,²(), 刘筱颖¹, 董伟³, 张河猛⁴, 王永军¹, 佐佐木久郎⁵

¹ 辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛 125000
² 辽宁工程技术大学工程与环境研究所,辽宁葫芦岛 125000
³ 交通运输部科学研究院,北京 100029
⁴ 辽宁工程技术大学矿业学院,辽宁阜新 123000
⁵ 九州大学工学府,日本福冈 819-0385

收稿日期:2021-11-16 修回日期:2022-01-12 出版日期:2022-08-18

作者简介:

张晓明 (1962—),男,吉林长春人,博士,教授,博士生导师,主要从事地下空间气象环境、煤层气和可燃冰开发、CO₂地下封存、土木基础设施抗震性能评估、煤炭自然发火特性等方面的研究。E-mail: xmzhang7@126.com。

王永军讲师

佐佐木久郎教授

基金资助:
日本JSPS科研费资助项目(JP-20K21163)

Experimental study on soil surface CO₂ fluxes in goaf area of Haizhou open-pit mines

ZHANG Xiaoming¹^,²(), LIU Xiaoying¹, DONG Wei³, ZHANG Hemeng⁴, WANG Yongjun¹, SASAKI Kyuro⁵

¹ College of Safety Science and Engineering, Liaoning Technical University, Huludao Liaoning 125000, China
² Institute of Engineering and Environment, Liaoning Technical University, Huludao Liaoning 125000, China
³ China Academy of Transportation Science, Beijing 100029, China
⁴ College of Mining Engineering, Liaoning Technical University, Fuxin Liaoning 123000, China
⁵ Faculty of Engineering, Kyushu University, Fukuoka 819-0385, Japan

Received:2021-11-16 Revised:2022-01-12 Published:2022-08-18

摘要/Abstract

摘要：

为探究海州露天矿东邦废弃采空区自然发火状态,基于采空区遗煤自燃特性和气体扩散理论,采用智能土壤气体通量监测系统,以月为单位,对东邦自燃采空区上覆地表CO₂通量开展长周期、多测点连续性监测试验;根据试验区域内地表CO₂通量和土壤温度分布特征,探究地下火区释放CO₂的地表涌出范围和变化情况;同时,着眼于温室气体排放的评估,计算试验区域内的CO₂涌出量,并分析其随时间的变化特征。结果表明:地表CO₂通量与土壤温度有明显正相关性;试验区域地表CO₂高通量区域呈逐月扩大和递增的趋势;CO₂涌出量随月份逐渐递增,试验区域年CO₂涌出量约为3.6×10⁶ m³。

关键词: 海州露天矿, 采空区, 地表CO₂通量, 遗煤自燃, 土壤温度

Abstract:

In order to study status of spontaneous combustion in Dongbang abandoned goaf in Haizhou open-pit mine, based on characteristics of spontaneous combustion and gas diffusion theory of residual coal in goaf, Intelligent Soil Gas Flux Monitoring System was used to continuously (monthly) monitor soil surface CO₂ fluxes at measuring points in Dongbang goaf. According to distribution characteristics of surface CO₂ fluxes and soil temperature in the experimental region, emission range and variation of CO₂ released from underground fire area were explored. At the same time, CO₂ emission in the area was calculated and its variation with time was analyzed. The results show that soil surface CO₂ fluxes are positively correlated with soil temperature. The area of high CO₂ fluxes in the experimental region shows a trend of monthly expansion and increase. Moreover, CO₂ emission gradually increases every month, and the annual emission in the experimental region is about 3.6×10⁶ m³.

Key words: Haizhou open-pit mine, goaf, soil surface CO₂ fluxes, spontaneous combustion of residual coal, soil temperature

张晓明, 刘筱颖, 董伟, 张河猛, 王永军, 佐佐木久郎. 海州露天矿采空区地表CO₂通量的试验研究[J]. 中国安全科学学报, 2022, 32(2): 66-73.

ZHANG Xiaoming, LIU Xiaoying, DONG Wei, ZHANG Hemeng, WANG Yongjun, SASAKI Kyuro. Experimental study on soil surface CO₂ fluxes in goaf area of Haizhou open-pit mines[J]. China Safety Science Journal, 2022, 32(2): 66-73.

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标号	CO₂体积分数/10^-6	温度/℃	湿度/%
Ⅰ	137 010	63.0	100
Ⅱ	107 016	68.0	100
Ⅲ	115 640	68.2	100

位置	昼夜温度/℃	CO₂通量值/ (μmol·m^-2·s^-1)
自燃采空区(26号)	28.2~38.6	11.4~12.8
非采空区	16.0~24.0	0.26~0.47

日期	裂缝标号	CO₂体积分数 C/10^-6	裂缝截面积 S_f/m²	涌出速度v/ (m·s^-1)	CO₂涌出量Q₂/ (m³·月^-1)	合计/ (m³·月^-1)
2019年10月	Ⅰ	201 612	0.13	0.80	39 484.69	265 943.87
	Ⅱ	114 660	0.62	1.30	166 663.26
	Ⅲ	115 934	0.22	1.30	59 795.92
2019年11月	Ⅰ	111 230	0.13	1.21	31 581.63	258 959.18
	Ⅱ	110 544	0.62	1.21	149 683.67
	Ⅲ	107 800	0.22	1.82	77 693.88
2019年12月	Ⅰ	112 406	0.13	1.71	45 132.65	332 617.35
	Ⅱ	111 524	0.62	1.71	213 566.33
	Ⅲ	108 780	0.22	1.71	73 918.37
2020年1月	Ⅰ	122 794	0.13	1.21	34 948.98	266 770.41
	Ⅱ	91 336	0.62	1.22	123 066.33
	Ⅲ	130 046	0.22	2.09	108 755.10

海州露天矿采空区地表CO₂通量的试验研究

Experimental study on soil surface CO₂ fluxes in goaf area of Haizhou open-pit mines

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