生物炭改性填埋场覆盖层土的渗气特性研究

doi:10.13722/j.cnki.jrme.2022.0041

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Abstract Biochar has a porous structure，higher specific surface area and stronger adsorption characteristics. Adding biochar to the traditional clay cover of landfill，i.e.，biochar-amended clay cover，so as to achieve the purpose of biologically reducing the methane released from the landfill. Adding biochar could change the pore structure of the soil and improve the air mobility in the soil, but the mechanism of influence on the air flow characteristics of the landfill cover is not clear. Therefore，the air permeability characteristics of biochar-clay mixed soil were used as the main evaluation indicators to explore the influence law and mechanism of biochar content and particle size on the air permeability characteristics of biochar-clay mixed soil. The air permeability coefficient ka of biochar-clay mixed soil with different biochar contents and different biochar particle size groups was measured by using the self-developed flexible wall air permeability testing device，and the changes of pore size distribution are analyzed by nuclear magnetic resonance(NMR) technique. The research results show that for the biochar-clay mixed soil whose dry density is not less than 90% of the maximum dry density of clay，there was an optimal biochar content，and its air permeability coefficient is the lowest. When the content of biochar is less than the optimal value，the air permeability coefficient decreases with the increase of the content of biochar, and the trend is more obvious at lower dry density. When the biochar content was larger than the optimal value，the air permeability coefficient gradually increases with the increase of the content of biochar. Comparing the air permeability coefficient of biochar-clay mixed soil with different biochar particle size groups without overlap，the permeability coefficient decreases with the decreased of biochar particle size. The NMR microscopic test results were used to explain the change mechanism of the air permeability coefficient of biochar-clay mixed soil increasing with the increase of biochar content and particle size under specific conditions. This study can provide a reference for the selection of biochar dosage and particle size for the design and construction of the final cover layer of biochar-amended clay in landfills.

Key words： soil mechanics biochar-clay mixed soil content particle size air permeability nuclear magnetic resonance pore size distribution

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	LI Mingyu1
	SUN Wenjing2

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LI Mingyu1,SUN Wenjing2. Gas permeability characteristics of biochar-amended landfill cover soil [J]. , 2022, 41(S2): 3543-3550.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0041 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3543

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