蔗渣生物炭对水稻土抗剪强度和渗透系数的影响  

Effects of bagasse biochar on shear strength and permeability of paddy soil

作　　者：郏金晨 王创业 徐煜 李科[1] 徐勤学[2,3] JIA Jinchen;WANG Chuangye;XU Yu;LI Ke;XU Qinxue(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Areas,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学广西环境污染控制理论与技术重点实验室科教结合科技创新基地,广西桂林541004 [3]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004

出　　处：《河南工程学院学报（自然科学版）》2024年第2期31-36,共6页Journal of Henan University of Engineering：Natural Science Edition

基　　金：广西重点研发计划项目(桂科AB22035075)。

摘　　要：为研究不同生物炭添加量对水稻土力学特性的影响,以灵川县三街镇水稻土为研究对象,对其添加不同比例(0%、2%、4%、6%)的生物炭,进行直剪试验和渗透试验。通过直剪法测定改良前后土样的内聚力和内摩擦角,并同时测量土样的渗透系数,以此评估改良效果,分析生物炭对水稻土抗剪强度和渗透系数的影响规律。结果显示,当生物炭添加量为水稻土质量的6%时,土样的黏聚力和内摩擦角均达到了最大值,分别为77.0 kPa和30.6°,同时土样的渗透系数显著下降。通过扫描电子显微镜(SEM)对生物炭改良水稻土进行分析可知,掺入生物炭后,生物炭填充了土粒间的孔隙,并与土粒产生胶结作用,提高了土体的强度。In order to study the effects of different biochar additions on the mechanical properties of paddy soil,the paddy soil of Sanjie Town of Lingchuan County was taken as the research object,and the direct shear test and penetration test were carried out on the paddy soil with different ratios of biochar(0%,2%,4%,6%).The cohesion and internal friction angle of soil before and after the improvement were measured by direct shear method,and the permeability coefficient of soil samples was measured at the same time to evaluate the improvement effect,and the influence of biochar on the shear strength and permeability coefficient of paddy soil was analyzed.The results showed that when the amount of biochar was 6%of the mass of paddy soil,its cohesion and internal friction angle reached the maximum value,which were 77.0 kPa and 30.6°,respectively.At the same time,the permeability coefficient of the improved soil sample significantly decreased.Moreover,the analysis of biochar improved paddy soil by scanning electron microscopy(SEM)showed that the biochar filled the pores between soil particles after incorporation,and had a cementation effect with soil particles,which increased the strength of soil.

关 键 词：生物炭 水稻土 抗剪强度 渗透系数 

分 类 号：TU411[建筑科学—岩土工程]