Estimation of Deformation Modulus of Soil in Field from Laboratory Tests

초록

Extended Abstract For quality evaluation of sub-grade soil of high speed railway track, loading and unloading plate tests are required. In order to know the deformation and strength characteristics of soil by the plate loading test in advance, simplified relationships using laboratory-based tests are presented. In this study plate load tests from small size to large size (2,000mm×2,000mm×1,200mm) varying the ratio(D/B) of chamber size(D) to plate size(B) were performed to estimate the quality of sub-grade soil by laboratory test. The plate load tests were carried out following DIN 18134 currently using in field on sandy soil for different ratio of D/B and deformation moduli, E_v, were obtained. The deformation moduli from small size tests were compared to that from large chamber tests where boundary influence can be neglected. In order to estimate deformation moduli from the small size plate loading tests, the ratio of strain modulus, E_v2, of second loading cycle to that of first loading cycle, E_v1, were presented as E_v2/E_v1 =5.39 log?(D/B)+1.68