Cap-hardening parameters of Cam-clay model variations with soil moisture content and shape-restricted regression model

摘要: Modeling of soil elastic and permanent plastic volumetric strains (compaction) caused by loading from machinery vehicles using the modified Cam-clay constitutive model requires understanding behaviors compression rebound parameters under unsaturated conditions. Oedometer tests were conducted on a sandy loam, clay loam soil, all tropical soils, at three initial moisture contents five maximum stress levels (50, 100, 200, 300 400 kPa). The objectives to investigate effects content applied index ( l *) k soils predict compressibility indices shape-restricted modeling technique. showed higher lower wet conditions (-10 kPa potential) but as increased (> 200 kPa), variations with insignificant p > 0.05). A exhibited similar characteristics 26.12% d.b. 23.67% d.b., respectively. For both critical state less sensitive in content. which had an organic matter 6.33%, rebounded more than especially values. On average, * ) was about 23 36 times ).  Shape-restricted quadratic fittings are presented explain relationship between stresses for each fitting results indicated that regression predicted function (or pre-compression stress) very low Average Squared Error Loss (ASEL) did so better parametric equations. Keywords: m odified ), axial stress, uniaxial cyclic test, moisture, types