Research on existing overloaded railway subgrade compaction index changing in relation to N₁₀ and moisture content separately

The railway subgrade compaction indexs of foundation coefficient K30，dynamic elastic modulus Evd，the second rebound modulus EV2， the second resilient modulus and a second resilient modulus EV2 / EV1，light dynamic penetrationN10，and moisture content w were obtained by field test in SHU-HUANG railroad.Based on the above datas，The changing relationship of foundation compaction indexes —K30，Evd，EV2，EV2/EV1，N10，and moisture content w separately were researched.The mentioned estimation methods in K30，EV2，EV2/EV1，Evd being estimated by use of N10 were proposed.The applicable conditions of estimation method was obtained through examples verification：① the silty clay as main filler was belong to c group，the moisture content being 8%～14%；② N10 range was 17～30，and EV2/EV1 was estimated to fix error.The results were shown：The method proposed was great importance，for the existing heavy rail roadbed filler Group C rapid detection and evaluation.