Development of light-weight soil using excavated sand and its application for harbor structures in cold regions

摘要

The light-weigth soil constrction method was developed to meet demands for reducing relative and uneven settlement, decrease earth pressure, prevent lateral displacement and improve earthquake resistance of harbor and airport structures. It was decided to use this method for Ishikari Bay New Port in Japan, primarily to reduce the earth pressure behind existing quaywalls. However, the viscosity of the material soil was extremely low. Therefore, it was necessary to adjust the grain size distribution of the soil material. Because this method is expected to be used even in winter, when temperature falls below zero, it is also necessary to examine physical properties of this soil before it is placed and cured at low temperatures. This study summarizes the mixing methods for light-weight soil, the results of laboratory experiments on its physical properties at low temperatures corresponding the construction conditions at Ishikari Bay New Port, and the results of the on-site construction during winter.