0.9911),紅土層與斑紋層的土壤收縮曲線分段現(xiàn)象明顯,而砂土層則變化平緩,土壤質(zhì)地越黏重線縮率越大;崩崗不同層次土壤的收縮特性差異顯著,紅土層與斑紋層的徑向收縮應(yīng)變大于軸向收縮應(yīng)變,在干燥過程中易產(chǎn)生張拉裂隙,砂土層則相反,在干燥過程中易發(fā)生表面下沉。相關(guān)性分析表明,徑向收縮應(yīng)變與砂粒含量有極顯著的負(fù)相關(guān)關(guān)系(r=-0.933),而軸向收縮應(yīng)變受土壤質(zhì)地影響不明顯,體積收縮應(yīng)變和縮限與黏粒和砂粒分別呈顯著正相關(guān)(r=0.891)和負(fù)相關(guān)關(guān)系(r=-0.838),說明崩崗?fù)馏w收縮過程受土壤質(zhì)地及土壤基質(zhì)吸力的綜合影響。"/>

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崩崗體剖面土壤收縮特性的空間變異性
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“十二五”國家科技支撐計劃資助項目(2011BAD31B04)和國家自然科學(xué)基金資助項目(41471231)


Spatial Variability of Soil Shrinkage Characteristics in Profile of Slope Disintegration Body
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    采用SS—1型土壤收縮儀測定崩崗體不同層次原狀土壤的收縮特征曲線,研究崩崗?fù)寥朗湛s特性的空間變異性。結(jié)果表明:脫水過程中崩崗?fù)寥赖木€縮率呈現(xiàn)先增大后穩(wěn)定的趨勢,Logistic 模型可以較好地擬合線縮率與含水率間的關(guān)系(R2>0.9911),紅土層與斑紋層的土壤收縮曲線分段現(xiàn)象明顯,而砂土層則變化平緩,土壤質(zhì)地越黏重線縮率越大;崩崗不同層次土壤的收縮特性差異顯著,紅土層與斑紋層的徑向收縮應(yīng)變大于軸向收縮應(yīng)變,在干燥過程中易產(chǎn)生張拉裂隙,砂土層則相反,在干燥過程中易發(fā)生表面下沉。相關(guān)性分析表明,徑向收縮應(yīng)變與砂粒含量有極顯著的負(fù)相關(guān)關(guān)系(r=-0.933),而軸向收縮應(yīng)變受土壤質(zhì)地影響不明顯,體積收縮應(yīng)變和縮限與黏粒和砂粒分別呈顯著正相關(guān)(r=0.891)和負(fù)相關(guān)關(guān)系(r=-0.838),說明崩崗?fù)馏w收縮過程受土壤質(zhì)地及土壤基質(zhì)吸力的綜合影響。

    Abstract:

    Soil shrinkage curves of different depths in slope disintegration profiles were measured using soil shrinkage tester (SS—1 type) to investigate the spatial variability of soil shrinkage characteristics. Results showed that in the process of dehydration, soil linear shrinkage ratio displayed increase firstly and then attained to steady level. The relationship between linear shrinkage ratio and water content can be fitted well by the Logistic model. Soil shrinkage curves of red soil layer and speckle soil layer could be apparently divided into three stages. The variation rate in soil linear shrinkage ratio showed an unimodal trend with the decreasing of soil water content, which was not suited to that of sandy soil layer. Linear shrinkage ratio increased when soil texture changed to heavy. Significant difference was found in shrinkage characteristic between different layers of slope disintegration body. Radial shrinkage strain was larger than axial shrinkage strain for red soil layer and speckle soil layer but it was opposite for sandy soil layer, which indicated that horizontal cracks mainly occurred in surface layer during the soil dryness dynamic process. Correlation analysis showed that radial shrinkage strain was positively correlated with sand content (r=-0.933); volume shrinkage strain and shrinkage limit were significantly correlated with clay content positively (r=0.891) and sand content negatively (r=-0.838), which indicated that soil shrinkage process was influenced by both soil texture and soil water state. Measures could be taken to reduce drastic variation of soil water content to prevent damage from shrinkage behavior in slope stability.

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魏玉杰,吳新亮,蔡崇法.崩崗體剖面土壤收縮特性的空間變異性[J].農(nóng)業(yè)機(jī)械學(xué)報,2015,46(6):153-159. Wei Yujie, Wu Xinliang, Cai Chongfa. Spatial Variability of Soil Shrinkage Characteristics in Profile of Slope Disintegration Body[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(6):153-159.

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  • 收稿日期:2014-06-30
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  • 在線發(fā)布日期: 2015-06-10
  • 出版日期: 2015-06-10