International Journal of Earth Sciences and Engineering

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Improvement of the expansive soil is one of the vital issues in the field of subgrade engineering. This paper is based on the test section of Xi’an-Nanjing double track engineering, respectively adopt quick lime and cement as expansive soil improvers, adopts quick lime and cement as expansive soil improvers ,conducts a study on the swell-shrinking property, strength characteristics and strength change law under drying and wetting cycles of NanYang expansive soils. The results show that the lime-improved expansive soil and cementimproved expansive soil can also effectively reduce the swell-shrinking property of expansive soils, which strength can reach the requirement of subgrade filling engineering. The lime-improved expansive soil has better effect in the shearing characteristics, compaction characteristics, permeation characteristics and the ability to lower expansibility than the cement-improved expansive soil. But the cement-improved expansive soil possesses better characteristic of strength reduction after drying and wetting cycles than the lime-improved one. The lime resource is more abundant and the price is cheaper than cement in NanYang city. So the lime-improved expansive soil is one of the most effective and economic method for improvement of the expansive soil.

Keywords

Expansive Soil, Subgrade Improvement, Shear Characteristics, Expansion, Wetting-Drying Cycle.
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