9. Practice in the Construction of the Lime-Treated Soil Highway Subgrades in Jiaxing City

(1) The soil–stone slag mixture construction control has difficulty in satisfying the requirements, which may easily cause differential settlement in highway during service. The lime-treated soil particles are uniform, and a plate body structure can form after construction. (2) The water stability of the soil–stone slag mixture is low, water can easily permeate the subgrade, which induces an adverse impact. The water stability of the lime-treated soil is high; the resulting plate body structure exhibits a certain water-resisting property. (3) The exploitation of the soil–stone slag mixture causes severe damage to the local ecological environment. From 2013, the government shut down numerous quarries, leading to shortage of soil–stone slag mixtures. The lime-treated soil can be easily obtained from the plain areas in Zhejiang Province, such as the waste soil from hydraulic reclamation in the Qiantang River, canal dredging, drilling in overpass construction, can be utilized. A comparison between the soil–stone slag mixture subgrade and the lime-treated soil subgrade in Jiaxing City is provided in Table (9.1).