生石灰安定処理による路床土の凍上抑制効果について-その1-

概要

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Soil stabilization was applied by using quick lime in order to increase the strength and prevent the frost heave of weak subgrade at a road construction site. The site investigation revealed that the soil was deposited due to repeated landslides of the surrounding unstable slope consisting of sand and silt for the past tens of thousands of years. This paper presents the quick lime stabilization design of the subgrade from the bearing strength point of view based on the CBR test results for the quick lime mixed soil. A series of laboratory frost heave tests was also performed to confirm the frost heave control effects of quick lime for the soil samples. A new and simple frost heave test apparatus was developed and used for the present test for convenience to deal large number of test in future. According to the test results, the amount of frost heave decreased with increasing additive amount of lime. The frost heave control effect of quick lime stabilization is presently investigated on-site through measurements of depth distributions of temperature and displacement under the road.
2007-03-30