膨胀力概念及其增湿规律试验研究

通过对膨胀土膨胀力概念的剖析,指出《岩土工程基本术语标准》(GB/T 50279-98)界定的膨胀力为极限膨胀力。根据对膨胀土增湿试验的研究,得出:前期增湿会引起较大的膨胀力,在达到一定程度后出现拐点,以后膨胀力的增加趋于缓慢且近于线性;换算膨胀力与初始含水率成非线性负相关关系。同时探讨了极限膨胀力影响因素,试验表明,不同含水率制备的相同干密度的土样的极限膨胀力随初始含水率的增大而减小,对以往典型试验现象做了解释。

STUDY ON CONCEPT OF SWELLING FORCE AND ITS MOISTENING TRIAL REGULARITY

The concept of swelling force of expand soils was analyzed and it was pointed out that the swelling force described by "Basic Nomenclature Standard of Geotechnical Engineering"(GB/T 50279-98)was limit swelling force.The moistening trial to expansive soils sample was carried out and some valuable conclusion was drew that the moistening will come into being greater swelling forces at forepart and the inflexion comes forth to a certainty phase and then the relation approximates to linear,and that the relation is the non-linear negative correlativity of primary water content and the conversion swelling force.It was discussed that the influence factors on limit swelling force and it was indicated by trial that limit swelling force will decrease with increasing of primary water content for remolded soils sample with same dry density.And some representative trial regularity was made clear.