In nature, soils could be compacted due to own weights, external loads and internal forces as a result of wetting and drying processes. Intrinsic properties such as texture and dynamic properties such as water content, wetting and drying cycles and external loads are recognized as being important factors influencing soil compactibillity. Soil compaction in sugarcane fields usually occurs due to flood irrigations during intensive crop production as well as mechanized harvesting operations by using heavy machinery in wet soils, respectively. Estimating the soil stress at its compaction threshold (i.e. pre-compaction stress, s pc ) and the soil sensitivity to excess compaction (deformability coefficient, C D or compression index, C C ) when the applied stresses due to the field traffic exceed the ? pc, can be useful to prevent soil compaction. The objectives of this research were: (a) to study the changes in s pc and C D of coarse (Sandy loam) and fine (silty clay) textured soils with/without wetting and drying cycles, (b) to determine soil shear strength parameters of the soils, (c) to determine the relationship between the measured physical and mechanical parameters, and (d) to obtain the water retention characteristics curves for the soils. Disturbed soil samples with coarse (Sandy loam) and fine (silty clay) textured soils were taken from the topsoil (0-20 cm layer) of the sugarecane fields in Ahvaz province. The compressive properties (s pc , C D and C C ) of the two soils with or without wetting and drying cycles at two water contents of 0.9 plastic limit (PL) and 1.1PL and three preloads (0, 100 and 200 kPa) were obtained using plate sinkage test (PST) and confined compression test (CCT). Stress-sinkage and stress-strain curves were drawn for both PST and CCT, respectively. For each curve, three different methods were considered to determine the s pc . These methods were: (1) Casagrande method, (2) maximum curvature and (3) intersection of virgin compression line (VCL) and x axis. Soil shear strength parameters (cohesion, c and internal friction angle, f) were measured using a direct shear box test. Results showed that in PST, the maximum and minimum values of s pc were obtained with Casagrande and maximum curvature methods,, respectively. In CCT, the maximum values of s pc were obtained with Casagrande method and the minimum values of s pc were obtained sometimes with maximum curvature method or with intersection of VCL and x axis. When the soil texture changed from sandy loam to silty clay, the s pc decreased about 5.5 and 27% in PST and CCT, respectively, With 5 cycles of wetting and drying samples compared to no wetting and drying, the s pc increased by 27.5 and 23% in PST and CCT, respectively. When the water content increas