考虑干湿循环路径的石灰改性红黏土路用性能试验研究

›› 2012, Vol. 33 ›› Issue (9): 2619-2624.

• Fundamental Theroy and Experimental Research • Previous Articles Next Articles

Experimental study of pavement performances of lime-treated laterite soil considering drying-wetting cycle paths

CAO Hao-rong^{1, 2}, LI Xin-ming¹, FAN You-jie³, WANG Yong¹

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Changsha Planning ＆Design Institute Co., Ltd, Changsha 410007, China; 3.China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China

Received:2011-05-12 Online:2012-09-11 Published:2012-09-12

Abstract

Abstract: Laterite soil is one kind of high plastic clay being very sensitive to environmental heat and moisture variation, and mixing optimal ratio of lime into laterite soil is made when construction to improve pavement performance and prolong the life span. Engineering properties of subgrade are obviously affected by soil moisture state and its drying-wetting history during excavation and exertion of the expressway. Experimental investigations on strength and deformation properties of lime-treated laterite soil and laterite soil are carried out, considering two drying-wetting paths which are exactly accordant with practices. The results indicate that: with uniformity drying-wetting cycles, lime-treated soil, internal friction angle increase a little and cohesive strength decrease with shearing strength reducing and pavement performance has not improved greatly. With directional drying-wetting cycles, lime-treated soil have less drying-shrinking cracks with unconfined compression strength and deformation resistance decreasing a little and the long-term strength and deformation performance enhanced significantly.

Key words: laterite soil, drying-wetting cycle path, lime-treated soil, pavement performance

CLC Number:

TU 446

CAO Hao-rong , LI Xin-ming , FAN You-jie , WANG Yong . Experimental study of pavement performances of lime-treated laterite soil considering drying-wetting cycle paths[J]., 2012, 33(9): 2619-2624.

References

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