中文摘要：

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。

英文摘要：

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 plant dreg wheat straw pure soil,and the degree of soil crack in the order that plant dreg wheat straw wheat husk pure soil. The results can provide theoretical guidance and reference to study on soil physics under different soil additive conditions.