Correlation analysis of quality testing indexes of coarse grained soil subgrade of high-speed railway

Abstract

The compaction quality of subgrade is controlled by such indexes as high speed railway coarse soil subgrade adopts foundation coefficient K30, second deformation modulus Ev2 and dynamic deformation modulus Evd, but the three detection principles are similar. For the purpose of reducing the detection workload and improving the detection efficiency, based on a brief analysis of the test principles of the three indicators, this paper carries out the filling and testing of coarse grained soil subgrade, obtains the values of 10 groups of K30, Ev2 and Evd, and analyzes the correlation of K30, Ev2 and Evd . The results shows that both K30 and Ev2 have a good linear relationship with Evd and establish a corresponding functional relationship. The quality inspection scheme for coarse grained soil subgrade filling indirectly judged by the dynamic deformation modulus Evd and the secondary deformation modulus Ev2 is proposed.