膨胀土边坡的现场吸力量测  

OBSERVATION OF THE SUCTION IN EXPANSIVE SOILS SLOPE

作　　者：龚壁卫[1] 包承纲[1] 刘艳华 王钊[2] 

机构地区：[1]长江科学院 [2]武汉水利电力大学

出　　处：《土木工程学报》1999年第1期9-13,共5页China Civil Engineering Journal

基　　金：国家自然科学基金;长江科学院南水北调课题经费资助项目

摘　　要：论述了膨胀土边坡现场吸力量测的方法和成果。研究认为，膨胀上边坡的基质吸力沿深度呈指数函数分布，且边坡中存在一个吸力“临界深度”，在此深度以上，基质吸力受土质、气候、温度等环境因素影响较大；在此深度以下至地下水位以上，吸力一般较小但并不为零。比较挖方和填方边坡的观测成果可知填方边坡的基质吸力比相同深度控方边坡的基质吸力大１～２倍，这主要是因为填方边坡密度、含水量均较低。根据实测吸力与含水量的关系，本文还绘制了现场土一水特征曲线。研究成果为非饱和土理论应用于实际工程探索了经验。In this paper, the method and achievements of the suction measurements in expansive soils slope were discussed. The experimental results showed that the distribution of matric suction was in the shape of exponential function along the depth in expansive soils slope, and existed a 'critical depth'. Above this depth, the matric suction was influenced gnatly by the surrounding factors such as soil composition, climate, temperature and so on; from this depth down to the underground water level, the suction was quite small but not equal to zero. Compedng the measured results in excavation and fill slope, it can be found that the matric suction in fill slope was 1 - 2 times larger than that in excavation slope, the main reason was due to the lower density and water content in fill slope. This paper also showed the field soil-water characteristic curve according to the relation between suction and water content. The conclusions offered a significant experience for the unsaturated soils theory to be used in practical engineering.

关 键 词：非饱和土 膨胀土 现场试验 吸力量测 边坡 

分 类 号：TU413.62[建筑科学—岩土工程] TU443[建筑科学—土工工程]