土壤结持度对土壤失效模式影响的研究
发布时间:2021-11-19 14:28
土壤失效形式在评估土壤的机械特性和耕作效果方面扮演着重要角色,过去的几十年里,在评价土壤和工具机械参数对土壤失效形式等的影响方面进行了大量的研究,尽管如此,对于土壤失效形式和土壤-工具参数方面的关系缺少圆满的解释。这主要是由于土壤成因的复杂性、纹理、独特的气候条件以及基于不同土壤的耕作制度等原因造成的。本研究基于可靠的实验数据作为依据,反映基于土壤含水量的合理取值,发现含水率对不同土壤及土壤失效形式的的影响并无直接关系,相反土壤的结持限可以作为定量土壤失效形式的可靠参数。本研究既包括实验室试验也有田间试验,实验室试验在室内土槽中进行,土槽装置安装在南京农业大学工学院的农业机械实验室,田间试验在江苏省南京农业大学所属的江浦农场进行。在实验室实验中,测量了旱地土和水稻土在粘限、塑限和液限及粘着点时的土壤失效形式和相应的切削力。在田间实验中,对在塑限和液限及粘着点处的土壤失效形式与土槽实验情况进行了对比。土壤失效形式的仿真模型用有限元方法进行了标定和验证,并与室内土槽及实地实验的结果进行了比较。在土槽实验和田间实验中,对遵循着不同失效形式的土壤结构进行了量化,以便研究最佳的土壤失效形式。本论...
【文章来源】:南京农业大学江苏省 211工程院校 教育部直属院校
【文章页数】:136 页
【学位级别】:博士
【部分图文】:
图2.1液压机??2.1.2?Soil?cutti打g?1;est?rig?for?laboratory?experiments??
希危牐樱希桑蹋牐疲琳?眨遥牛牐校粒裕裕牛遥危樱崳?图2.2实验用止壤切削实验机构??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??图2.3数据采集程序??2.1.3?Soil?cutting?test?procedure??The?soil?cutting?化St?was?performed?at?three?consistency?limits?(sticky?limit,??plastic?limit?and?liquid?limit)?and?at?the?sticky?point?of?the?soil,?fac1;oriaIly?combined??wi化?three?rake?angles?(15〇,?30。and?45〇)?and?three?operating?depths?(30?mm,50?mm?/??and?70?nun),?as?done?by?Wang?…,Makanga?et?al.阀,and?Aluko?and?Seig【4].?A?flat??triangular?shaped?tool?was?used?in?all?experiments.?In?order?to?adjust?也e?cutting?化ol??at?different?depths
希危牐樱希桑蹋牐疲琳?眨遥牛牐校粒裕裕牛遥危樱崳?图2.2实验用止壤切削实验机构??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??图2.3数据采集程序??2.1.3?Soil?cutting?test?procedure??The?soil?cutting?化St?was?performed?at?three?consistency?limits?(sticky?limit,??plastic?limit?and?liquid?limit)?and?at?the?sticky?point?of?the?soil,?fac1;oriaIly?combined??wi化?three?rake?angles?(15〇,?30。and?45〇)?and?three?operating?depths?(30?mm,50?mm?/??and?70?nun),?as?done?by?Wang?…,Makanga?et?al.阀,and?Aluko?and?Seig【4].?A?flat??triangular?shaped?tool?was?used?in?all?experiments.?In?order?to?adjust?也e?cutting?化ol??at?different?depths
本文编号:3505236
【文章来源】:南京农业大学江苏省 211工程院校 教育部直属院校
【文章页数】:136 页
【学位级别】:博士
【部分图文】:
图2.1液压机??2.1.2?Soil?cutti打g?1;est?rig?for?laboratory?experiments??
希危牐樱希桑蹋牐疲琳?眨遥牛牐校粒裕裕牛遥危樱崳?图2.2实验用止壤切削实验机构??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??图2.3数据采集程序??2.1.3?Soil?cutting?test?procedure??The?soil?cutting?化St?was?performed?at?three?consistency?limits?(sticky?limit,??plastic?limit?and?liquid?limit)?and?at?the?sticky?point?of?the?soil,?fac1;oriaIly?combined??wi化?three?rake?angles?(15〇,?30。and?45〇)?and?three?operating?depths?(30?mm,50?mm?/??and?70?nun),?as?done?by?Wang?…,Makanga?et?al.阀,and?Aluko?and?Seig【4].?A?flat??triangular?shaped?tool?was?used?in?all?experiments.?In?order?to?adjust?也e?cutting?化ol??at?different?depths
希危牐樱希桑蹋牐疲琳?眨遥牛牐校粒裕裕牛遥危樱崳?图2.2实验用止壤切削实验机构??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??图2.3数据采集程序??2.1.3?Soil?cutting?test?procedure??The?soil?cutting?化St?was?performed?at?three?consistency?limits?(sticky?limit,??plastic?limit?and?liquid?limit)?and?at?the?sticky?point?of?the?soil,?fac1;oriaIly?combined??wi化?three?rake?angles?(15〇,?30。and?45〇)?and?three?operating?depths?(30?mm,50?mm?/??and?70?nun),?as?done?by?Wang?…,Makanga?et?al.阀,and?Aluko?and?Seig【4].?A?flat??triangular?shaped?tool?was?used?in?all?experiments.?In?order?to?adjust?也e?cutting?化ol??at?different?depths
本文编号:3505236
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