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Influence of soil density on gas permeability and water retention in soils amended with in-house produced biochar

Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 593-602页

作者： Ankit Garg He Huang Weiling Cai Narala Gangadhara Reddy Peinan Chen Yifan Han viroon k.mchoom Shubham Gaurav Hong-Hu Zhu Department of Civil and Environmental Engineering Guangdong Engineering Center for Structure Safety and Health MonitoringShantou UniversityShantouChina Department of Civil Engineering Kakatiya Institute of Technology and ScienceWarangalIndia Department of Civil Engineering King Mongkut’s Institute of Technology LadkrabangBangkokThailand Department of Biology Science and Biology Technology Indian Institute of Technology GuwahatiGuwahatiIndia School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China

Biochar has been used as an environment-friendly enhancer to improve the hydraulic properties(*** and water retention)of ***,variations in densities alter the properties of the soil ebiochar *** density variations are observed in agriculture(loosely compacted)and engineering(densely compacted)*** influence of biochar amendment on gas permeability of soil has been barely investigated,especially for soil with different *** major objective of this study is to investigate the water retention capacity,and gas permeability of biochar-amended soil(BAS)with different biochar contents under varying degree of compaction(DOC)***-house produced novel biochar was mixed with the soil at different amendment rates(*** contents of 0%,5%and 10%).All BAS samples were compacted at three DOCs(65%,80%and 95%)in polyvinyl chloride(PVC)*** soil column was subjected to dryingewetting cycles,during which soil suction,water content,and gas permeability were measured.A simplified theoretical framework for estimating the void ratio of BAS was *** experimental results reveal that the addition of biochar significantly decreased gas permeability kg as compared with that of bare soil(BS).However,the addition of 5%biochar is found to be optimum in decreasing kg with an increase of DOC(i.e.k_(g,65%)>k_(g,80%)>k_(g,95%))at a relatively low suction range(kPa)because both biochar and compaction treatment reduce the connected pores.

关键词： Biochar Degree of compaction(DOC) Gas permeability Soil water retention Wettingedrying cycle

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