Abstract: The geotechnical investigation results of subgrade soils in coastal area expressway between Chikou and Haifeng are statistically analyzed. The variation, correlation and probability properties between the physically indices and the mechanical properties are evaluated. The following conclusions are observed: 1)variations of specific gravity, unit weight, and degree of saturation of subgrade soils in coastal Hebeiare very small. These parameters can be treated as constant in the engineering applications; 2)high correlations can be found in following: Compression coefficient and moisture content; compression coefficient and unit weight; compression coefficient and void ratio. Among these parameters, the compression coefficient and unit weight have negative relations, whereas, other pairs are positive correlated. 3)the probability distribution of moisture content, void ratio, and liquid limit have a logarithmic normal distribution and other indices have normal distribution.

Key words: Coastal Area, Physical and Mechanical Properties, Variation, Correlation, Probability Distributions