국내 철도궤도 흙노반 재료의 회복탄성계수(M_R)-전단탄성계수(G) 상관성 분석

초록

It is important to determine exact value of soil modulus based on stress-strain relationship of compacted subgrade soil under track that experiences dynamic load of the train. In particular, resilient modulus(MR) and shear modulus(G) are useful design input parameters that can be used to determine mechanical behavior of the subgrade soil under track. In this study, soil samples prepared for considering change of water content (OMC, ±2%) in the field are used for simulating upper subgrade soil and tested by cyclic triaxial compression test and mid-size resonant test(RC) in order to obtain resilient modulus(MR) and shear modulus(G), respectively. A correlation analysis was performed using those MR and G tested results. It is found that soil modulus including resilient modulus and shear modulus may increase seriously with decrease of water content.