非饱和土的基质吸力与毛细吸力  

Matric suction and capillary suction pressure in unsaturated soils

作　　者：张吉明[1] 李顺群[2] 任庆新[3] 

机构地区：[1]沈阳军区空军工程质量监督站 [2]天津城市建设学院土木工程系 [3]沈阳建筑大学土木工程学院

出　　处：《山西建筑》2007年第23期1-3,共3页Shanxi Architecture

基　　金：辽宁省教育厅科学研究计划资助项目(项目编号:2004F105)

摘　　要：从毛细现象和基质吸力的定义出发讨论了二者的联系和差别,指出毛细吸力和基质吸力是两个不同的概念,考虑到作用面积的影响,提出了等效基质吸力的概念,通过对理想粘土片和球形颗粒最松散堆积模型的计算分析得出了毛细上升高度和基质吸力表达式,研究表明,在毛细高度之内,基质吸力线性分布与含水量无关;在毛细高度之外,基质吸力非线性增长;另外对等效基质吸力沿高度的分布作了定性分析。Relationship and difference between capillary suction pressure and matric suction are discovered through detailed discussion starting from their definition. Formulas for computing capillary height and matric suction are established after study on ideal models either for clay patches paralleling or intersecting to each other or for round sand grains in condition of the lcosest arrangement. The study shows that matric suction of a point is linear and nonlinear to height above water table based on whether that point is lower or higher than peak of capillary. Fi- nally, distribution of equivalent matric suction along depth is put forward.

关 键 词：非饱和土 基质吸力 毛细吸力 表面张力 

分 类 号：TU411.3[建筑科学—岩土工程]