曲靖水城水库坝基膨胀土特性研究

在膨胀土地区构筑建筑物一直是岩土工程界探讨的热点, 尤其是在膨胀土地区修筑水库大坝更是水利工程中的难点, 为此, 本文结合水城水库实际工程, 对膨胀土的特性进行了系统试验研究。水城水库库区为一膨胀土地区, 拦河大坝为一心墙堆堆石坝, 最大坝高 5 9.2m。本项工作系统地进行了膨胀土的物理 -力学性质试验及分析, 尤其是膨胀率与干容重和含水量及外覆压力关系分析。得出了该地区膨胀土的膨胀性不仅与其自身矿物成分有着重要关系, 同时其是否表现为膨胀还取决于天然干容重的大小、含水量及外覆压力的大小, 并且得出了它们之间的相互关系规律。

STUDY ON THE BEHAVIOR OF SWELLING SOIL FROM THE SHUICHENG RESERVOIR FOUNDATION IN QUJING COUNTY

The issue of constructing buildings in swelling soil area is always a hot topic in geotechnical engineering circle, and is a hard subject in water conservancy projects. For this reason, systematic test and study of the properties of swelling soil is conducted in this paper in combination with the practical engineering work of Shuicheng Reservoir. The Shuicheng Reservoir is located in a swelling soil area, its dam is a stone-filling dam with a core wall, 59.2m height in maximum. Systematic physio-mechanical properties test and analysis, especially analysis of relationship between expansion rate, dry density, water content, and overlying pressure, are carried out. It is concluded that the expansion rate of swelling soil in this area is relatedd not only with mineral components in itself, but also dominated by natural dry density, water content, and the overlying pressure. The regularities of their relations are also got.