Design of Expansive Soil Filled Core Subgrade in Meiyu Climate Zone
Using expansive soil as the filling material for subgrade can effectively utilize the aban-doned soil generated from excavation of expansive soil ditches.Based on the engineering of expansive soil subgrade for Tongling Jiangbei Port Railway Special Line,a design method for expansive soil filled core subgrade in Meiyu climate zone was proposed.Firstly,the swelling force test of expansive soil was conducted.Then,the relationship between the internal volumetric water content of expansive soil filled core subgrade in Meiyu season and the type of surrounding cohesive soil,the thickness of surrounding soil layer and the compaction coefficient of subgrade was studied,and the development of swelling force of filled core expansive soil in Meiyu season was analyzed.Finally,the design scheme for expansive soil filled core subgrade was determined,and the swelling force was introduced into the formula for calculat-ing the safety factor of the broken-line sliding surface stability.The results show that using mild clay as the surrounding soil with a thickness of 1 m and a compaction coefficient of 0.92 for the expansive soil filled core subgrade of Tongling Jiangbei Port Railway Special Line not only reduces waste,but also meets the requirements of the specification.
万方数据
维普
