Abstract
The NaOH solution can activate the surface of soil particles and solidify each other at contact points to improve the mechanical strength of soil, therefor the alkali liquor reinforcement method has the advantages of simple construction, high reinforcement strength, good water stability and low cost, and is applicable to the reinforcement of cohesive soil foundation. For loess lacking calcium and magnesium ions, CaCl2 solution should be added and can react with NaOH to form Ca(OH)2 hydraulic cementing material which can significantly strengthen soil. The strength of soil strengthened by NaOH and CaCl2 double solution reinforcement is 1/3∼1/2 higher than that of single liquid reinforcement. As the operating load increases, it is necessary to reinforce the subgrade of a special railway line of Jinan city under the condition of normal traffic. The upgrading double liquid method is used for reinforcement and good results are obtained.
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