潭邵高速公路膨胀土特性与外部影响因素的关系

Relation of exterior influencing factors and characteristics of swelling soil in Xiangtan-Shaoyang expressway

(湘)潭—邵(阳)高速公路要穿越长约22km的膨胀土地带,面临严重的膨胀土自然病害问题。本文通过大量的室内试验,对所取3种膨胀土的膨胀特性与外部影响因素的关系进行了细致的研究。结果表明:膨胀土的起始含水量和干密度是影响膨胀力、膨胀量大小的主要外部因素;荷载的大小对膨胀量的影响也很显著,各土样膨胀量都有随荷载增大而减小的趋势。同时,通过对试验数据的半对数曲线回归分析,得出膨胀土的膨胀特性与外部影响因素的相关关系显著的结论。

For XiangtanShaoyang expressway crosses through about 22 km long swelling soil zone, a lot of severe natural hazards caused by swelling soil will be faced with. By a lot of tests on swelling soil in laboratory, relationship of exterior influencing factors and swelling charactersitic of three kinds of swelling soil samples has been studied deeply. Study results indicate that swelling force and swelling capacity are mainly determined by the water content and dry density, loading is also a remarkable influence on swelling capacity, and swelling capacity decreases with the increase of loading. At same time, according to the test data, half logarithm linear regressions are done, and correlation of swelling characteristics and exterior influence factors is very remarkable will be found.