Laboratory Tests and Numerical Analysis on the Grouting Reinforcement Effect for Soft-soil Subgrade Settlement of High-speed Railway

摘要

Grouting reinforcement is one of the most commonly used methods of subgrade treatment in soft-soil areas. In order to evaluate the grouting reinforcement effect of high-speed railway subgrade, a series of laboratory tests, such as direct shear test, compression test, and permeability test, etc., were carried out on the Shanghai mucky clay injected with cement slurry. Based on the analysis of test result, the rational range of slurry content and water-cement ratio remain the possibility to be drawn. For the sake of further understanding the variation law of displacement, stress, and plastic zone, etc., a series of numerical simulations were carried out on the soft soil subgrade reinforced with grouted slurry under the dynamic loading of high-speed train. According to the results on the numerical simulation, obtaining the rational grouting scheme and grouting pressure are able to achieve. The research results can provide a reference for some similar projects.