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

doi:10.16265/j.cnki.issn1003-3033.2022.02.010

Abstract

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

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.

Figures/Tables 10

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References 25

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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

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

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