土壤結(jié)持度對(duì)土壤失效模式影響的研究
發(fā)布時(shí)間:2021-11-19 14:28
土壤失效形式在評(píng)估土壤的機(jī)械特性和耕作效果方面扮演著重要角色,過(guò)去的幾十年里,在評(píng)價(jià)土壤和工具機(jī)械參數(shù)對(duì)土壤失效形式等的影響方面進(jìn)行了大量的研究,盡管如此,對(duì)于土壤失效形式和土壤-工具參數(shù)方面的關(guān)系缺少圓滿的解釋。這主要是由于土壤成因的復(fù)雜性、紋理、獨(dú)特的氣候條件以及基于不同土壤的耕作制度等原因造成的。本研究基于可靠的實(shí)驗(yàn)數(shù)據(jù)作為依據(jù),反映基于土壤含水量的合理取值,發(fā)現(xiàn)含水率對(duì)不同土壤及土壤失效形式的的影響并無(wú)直接關(guān)系,相反土壤的結(jié)持限可以作為定量土壤失效形式的可靠參數(shù)。本研究既包括實(shí)驗(yàn)室試驗(yàn)也有田間試驗(yàn),實(shí)驗(yàn)室試驗(yàn)在室內(nèi)土槽中進(jìn)行,土槽裝置安裝在南京農(nóng)業(yè)大學(xué)工學(xué)院的農(nóng)業(yè)機(jī)械實(shí)驗(yàn)室,田間試驗(yàn)在江蘇省南京農(nóng)業(yè)大學(xué)所屬的江浦農(nóng)場(chǎng)進(jìn)行。在實(shí)驗(yàn)室實(shí)驗(yàn)中,測(cè)量了旱地土和水稻土在粘限、塑限和液限及粘著點(diǎn)時(shí)的土壤失效形式和相應(yīng)的切削力。在田間實(shí)驗(yàn)中,對(duì)在塑限和液限及粘著點(diǎn)處的土壤失效形式與土槽實(shí)驗(yàn)情況進(jìn)行了對(duì)比。土壤失效形式的仿真模型用有限元方法進(jìn)行了標(biāo)定和驗(yàn)證,并與室內(nèi)土槽及實(shí)地實(shí)驗(yàn)的結(jié)果進(jìn)行了比較。在土槽實(shí)驗(yàn)和田間實(shí)驗(yàn)中,對(duì)遵循著不同失效形式的土壤結(jié)構(gòu)進(jìn)行了量化,以便研究最佳的土壤失效形式。本論...
【文章來(lái)源】:南京農(nóng)業(yè)大學(xué)江蘇省 211工程院校 教育部直屬院校
【文章頁(yè)數(shù)】:136 頁(yè)
【學(xué)位級(jí)別】:博士
【部分圖文】:
圖2.1液壓機(jī)??2.1.2?Soil?cutti打g?1;est?rig?for?laboratory?experiments??
希危牐櫻希桑蹋牐疲琳?眨遙牛牐校粒裕裕牛遙危櫻崳?圖2.2實(shí)驗(yàn)用止壤切削實(shí)驗(yàn)機(jī)構(gòu)??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學(xué)??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??圖2.3數(shù)據(jù)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.閥,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
希危牐櫻希桑蹋牐疲琳?眨遙牛牐校粒裕裕牛遙危櫻崳?圖2.2實(shí)驗(yàn)用止壤切削實(shí)驗(yàn)機(jī)構(gòu)??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學(xué)??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??圖2.3數(shù)據(jù)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.閥,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
本文編號(hào):3505236
【文章來(lái)源】:南京農(nóng)業(yè)大學(xué)江蘇省 211工程院校 教育部直屬院校
【文章頁(yè)數(shù)】:136 頁(yè)
【學(xué)位級(jí)別】:博士
【部分圖文】:
圖2.1液壓機(jī)??2.1.2?Soil?cutti打g?1;est?rig?for?laboratory?experiments??
希危牐櫻希桑蹋牐疲琳?眨遙牛牐校粒裕裕牛遙危櫻崳?圖2.2實(shí)驗(yàn)用止壤切削實(shí)驗(yàn)機(jī)構(gòu)??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學(xué)??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??圖2.3數(shù)據(jù)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.閥,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
希危牐櫻希桑蹋牐疲琳?眨遙牛牐校粒裕裕牛遙危櫻崳?圖2.2實(shí)驗(yàn)用止壤切削實(shí)驗(yàn)機(jī)構(gòu)??戶粗、倍剝??I?卿?I— ̄\%\??ILrunTJl?t±f?I??巧固表I??[fcdi??firn?…;??^……EMI??m?'口?學(xué)??p^L?i??I圓--…---….-??Fig.?2.3?Data?acquisitio打?diagram??圖2.3數(shù)據(jù)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.閥,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
本文編號(hào):3505236
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