粉煤灰改性膨胀土水稳定性试验研究

›› 2007, Vol. 28 ›› Issue (9): 1889-1893.

粉煤灰改性膨胀土水稳定性试验研究

冯美果，陈善雄，余颂，马佳

中国科学院武汉岩土力学研究所，武汉 430071

收稿日期:2006-09-07 出版日期:2007-09-10 发布日期:2013-10-15
作者简介:冯美果，男，1982年生，硕士，主要从事特殊土力学及其工程应用的研究

Laboratory study on water stability of flyash-treated expansive soil

FENG Mei-guo, CHEN Shan-xiong, YU Song, MA Jia

Institute of Rock and Soil Mechanics, Chinese Academy of Sciences,Wuhan 430071,China

Received:2006-09-07 Online:2007-09-10 Published:2013-10-15

摘要/Abstract

摘要： 针对典型中膨胀土及其粉煤灰改性土，进行了击实特性试验，并且在最优含水率、不同压实度状态下，进行了饱水后干密度、压实度变化特征试验，以及不同吸水时间、不同干湿循环次数下的无侧限抗压强度、压缩模量变化规律试验，以此探讨中膨胀土、粉煤灰改性膨胀土的水稳定性特征。试验结果表明：粉煤灰改性土可击实含水率范围较之未改性土宽，这给粉煤灰改性土路堤的施工带来了很大的方便。饱水之后，改性土的干密度和压实度比素土变化小，饱水能力不大，强度变化较小。改性土经过不同吸水时间和干湿循环次数之后，其强度最初发生急剧衰减，但最终趋于稳定。其衰减程度较之未改性土来说，有较大改善，水稳定性良好。

关键词: 粉煤灰, 膨胀土, 改性效果, 水稳性

Abstract: Laboratory tests on compaction behavior for middle expansive soil and flyash-treated soil have been carried out. And the dry density and degree of compaction changing specificity experiment after immersion , the varying character of unconfined compressive strength and modulus of compressibility in different soak periods and different wetting and drying cycles have been carried out in the state of optimal water content and different degrees of compaction. so as to study the water stability specificity of middle expansive soil and flyash-treated expansion soil. Test results show that: the range of compaction water content for flyash-treated soil is larger than middle expansive soil; this has brought great convenience for flyash-treated soil roadbed’s execution. And after absorbent, the fly ash-treated soil’s dry density and degree of compaction changes is smaller than middle expansive soil; less full water capacity, the variation of strength is small also. After different soak periods and different wetting and drying cycles, the strength of modified soil generate dramatic decay in the initial, and drive to stability of status in the last. But the property of strength decay have great improvement than the without modified soil; the water stability of flyash-treated soil is good.

Key words: flyash, expansive soil, effect of improvement, water stability

中图分类号:

TU443

冯美果，陈善雄，余颂，马佳. 粉煤灰改性膨胀土水稳定性试验研究[J]. , 2007, 28(9): 1889-1893.

FENG Mei-guo, CHEN Shan-xiong, YU Song, MA Jia. Laboratory study on water stability of flyash-treated expansive soil[J]. , 2007, 28(9): 1889-1893.

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