摘要：为解决膨胀土在建筑工程领域带来的危害,制作15,20,25 mm 3个高度邯郸膨胀土试样,研究了试样高度对膨胀特性的影响。利用控制变量的方法对不同尺寸的邯郸重塑膨胀土试样进行膨胀力和膨胀率试验。结果表明:试验高度范围内,在K0应力状态下,随着试样高度增加,膨胀力呈线性增加,试样高度每增加1 mm,膨胀力增大1.92 k Pa,膨胀土试样浸水过程产生的膨胀力不存在尺寸效应;随着试样高度增加,膨胀率的增长速度随之加快,膨胀率随着试样高度增加而增大,试样高度每增长1 mm,膨胀率约提高1.06%,膨胀率存在明显的尺寸效应。该研究结论可为区域性膨胀土区建筑工程的安全性和稳定性提供参考依据。

Abstract：Three kinds of height sample (i. e. 15 mm, 20 mm and 25 mm were made which height were 15 mm, 20 mm and 25 mm. The expansive force and rate of remolded expansive soils in Handan were tested. The influence of specimen height on the expansive characteristics was analyzed. The results show that under the K0 stress state, the expansive force increased linearly along with the increase of specimen height in the test height. The expansive force increases 1. 92 k Pa when the height of sample increases per 1 mm. The expansive force had no size effect during the wetting process. However, along with the increase of sample height, the growth rate of the free expansive ratio increases correlatively. The expansive rate of expansive soil varied with the height of the specimen. When the height of sample increased per 1 mm, the expansive ratio increased about 1. 06 % and the expansion rate had an obvious size effect.

关键词：膨胀特性;尺寸效应;膨胀力试验;重塑膨胀土;

DOI：10.16186/j.cnki.1673-9787.2018.02.019

分类号：TU443