唐东旗,彭建兵,孙伟青
TANG Dongqi,PENG Jianbing,SUN Weiqing(College of Geology Engineering and Geomatics

• 1:长安大学地质工程与测绘学院

摘要(Abstract)：

黄土属于非饱和土,具有明显的大孔隙、垂直节理发育、湿陷性等特征,使得黄土地区工程地质灾害问题频发。由于黄土具有水敏性,因此水的因素成为诱发地质灾害的主要因素。基质吸力的变化是土体边坡稳定的重要因素。利用滤纸法对非饱和黄土的基质吸力进行试验研究,得出随着含水率的增加基质吸力逐渐减小;在土体含水率较小时基质吸力的变化比较敏感,含水率越高,其变化越小;在含水率达到饱和时基质吸力消失为零;并且随含水率的增加土体的抗剪强度逐渐减小。研究认为,滤纸法对操作过程中空气条件要求相对严格,是一种能够快速、简便测试非饱和土体基质吸力的方法。
The loess belongs to the unsaturated soil,and has the geological characteristics,such as macro pore,vertical joints growth,wet collapsibility,etc.It makes the geological disasters occur frequently,seriously restricting the economic development in the loess area.Because the loess has water sensitivity,the water factors are the main factors for geological disasters.The change of soil suction matrix is the important factor for slope stability.The paper uses the filter paper method to study unsaturated loess matrix suction,the result shows the matrix suction gradually decreases with the moisture content increase.The matrix suction is more sensitive when the soil moisture content is smaller.Moisture content is higher,the change of the matrix suction is smaller;When the water content reaches saturation,the matrix suction disappears;and the soil shear strength gradually decreases with the increase of moisture content.It is considered that the filter method is a relatively simple and convenient.Through the research.,the filter paper method has strict requirement on around air in the operation process,is a quick,easy test method for the matrix suction of unsaturated soil.

关键词(KeyWords)： 滤纸法;非饱和黄土;基质吸力;土水特征曲线;抗剪强度
filter paper method;unsaturated loess;matrix suction;SWCC;shear strength

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金重点项目(41130753)

作者(Author): 唐东旗,彭建兵,孙伟青
TANG Dongqi,PENG Jianbing,SUN Weiqing(College of Geology Engineering and Geomatics

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