从饱和度再认识非饱和表层土吸力  

Reinspection of Unsaturated Surface Soil's Suction Based On Saturation

作　　者：刘小平[1] 赵明华[1] 陈安[2] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082 [2]中南大学地学与环境工程院

出　　处：《湖南大学学报（自然科学版）》2007年第7期22-26,共5页Journal of Hunan University:Natural Sciences

基　　金：教育部高等学校博士学科点专项基金资助项目(20020532008)

摘　　要：为了探讨非饱和土水膜中的重力水对总吸力的影响,根据饱和度大小情况,将非饱和土中的水、气形态分成了四类,即界限饱和度Sr1,Sr2,Sr3,Sr4.分析了非饱和土中的总吸力组成和水膜中重力水对总吸力的影响,并推导出界限饱和度Sr2条件重力水对总吸力影响的计算公式,在此基础上给出了颗粒级数分别为10-3mm^100mm的总吸力与饱和度的关系图.最后选择了一种试验值模拟比较.模拟比较表明,考虑重力水的作用下理论计算值与实测值更加吻合,从而证实了重力水对吸力的影响是不可忽略的.In order to approach the effect of the gravity water of the moisture film on the total suction in the unsaturated soil, the state of the water-atmosphere was clarified into four types based on the degree of saturation, namely, the boundary saturation Sr1, the boundary saturation Sr2, the boundary saturation Sr3, and the boundary saturation Sr4. The impression of the gravity water acting on the total suction was analyzed theoretically, and the calculation formula for the relationship between the total suction and the saturation degree was obtained. Correspondingly, the diagrams of the relationship with grain radii ranged 10^-3 mm ～-10^0 mm between the total suction and the saturation degree were also obtained. At the same time, an example was presented, which clearly confirms that the effect of gravity water on the total suction can not be ignored.

关 键 词：吸力 非饱和土 饱和度 毛细作用 水气形态分类 

分 类 号：TU441.31[建筑科学—岩土工程]