| 土壤添加物对土-水曲线和土体收缩的影响 |
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| 引用本文： | 邢旭光,柳烨,马孝义.土壤添加物对土-水曲线和土体收缩的影响[J].水科学进展,2016,27(1):40-48. |
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| 作者姓名： | 邢旭光 柳烨 马孝义 |
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| 作者单位： | 1.西北农林科技大学水利与建筑工程学院, 陕西 杨凌 712100; |
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| 基金项目： | 国家自然科学基金资助项目(51279167);水利部公益性行业科研专项经费资助项目(201301016) |
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| 摘 要： | 为探索不同添加物(小麦秸秆、麦壳和植物油渣)对土壤持水性能和土壤收缩特性的影响,定量掺混3种粉末,采用离心机法测定土-水曲线,并对土壤持水能力和土壤收缩特征进行评价。结果发现:各处理土-水曲线形态无差异,van Genuchten模型可用于此条件土-水曲线拟合;3种添加物均可提高土壤容重和土壤含水率并利于保水,且土壤持水能力表现为油渣 >麦秆 >麦壳 >纯土;随着土壤脱水,土体以轴向收缩为主,三直线模型可用于土壤收缩曲线拟合,土体线缩率与吸力和含水率分别满足对数和Logistic函数关系;土体几何收缩量表现为麦壳 <油渣 <麦秆 <纯土,土壤开裂程度表现为油渣 <麦秆 <麦壳 <纯土。
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| 关 键 词： | 水分特征曲线 土壤收缩 土壤裂缝 土壤添加物 |
| 收稿时间： | 2015-09-06 |
Effects of soil additive on soil-water characteristic curve and soil shrinkage |
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| XING Xuguang,LIU Ye,MA Xiaoyi.Effects of soil additive on soil-water characteristic curve and soil shrinkage[J].Advances in Water Science,2016,27(1):40-48. |
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| Authors: | XING Xuguang LIU Ye MA Xiaoyi |
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| Affiliation: | 1.College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling 712100, China;2.Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A & F University, Yangling 712100, China |
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| Abstract: | To explore the effects of additives on water retention and soil shrinkage characteristics, the experimental soil was mixed with the three types of additives(wheat strew, wheat husk and plant dreg), respectively. The soil water characteristic curves were measured by a centrifuge method, with water retention and soil shrinkage characteristic quantitatively evaluated. The results indicated there were few differences in the types of soil water characteristic curves of all treatments, and van Genuchten model was suitable for the curve fitting. Besides to increasing soil density and soil moisture, the three additives could strengthen water-retaining capacity, ranking in the order that plant dreg >wheat straw >wheat husk >pure soil. Furthermore, axial shrinkage occurred during dehydration, with the three-line model suitable for soil shrinkage curve fitting. A logarithmic function and a Logistic function were found in the relationship between suction and soil moisture, and soil linear ratio, respectively. Finally, the soil shrinkage was ranked in the order that wheat husk
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| Keywords: | soil water characteristic curve soil shrinkage soil crack soil additive |
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