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Values of small-strain shear modulus Gmax, for a Champlain Sea clay deposit were obtained both under an embankment built 18 years ago, and outside of the area influenced by this embankment. The small-strain shear moduli Gmax were measured in the laboratory by using resonant column tests and in the field by spectral analysis of surface waves. In addition to verifying the two methods, comparison of the in situ and laboratory values allowed evaluation of the influence of the sampling and the need to correct the laboratory values to account for the age of the deposit. The test program also made it possible to verify the influence of the deposit's consolidation and the existing models predicting small-strain shear moduli in clay deposits. Key words : shear modulus, shear-wave velocity, resonant column, in situ test, surface waves, soft clay.

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Abstract. The slope of Dahr El Baidar located on the central mountain of Lebanon hosts a section of the Arab Highway that is under construction to connect

The results of in-situ tests such as standard penetration test (SPT) and cone penetration test (CPT) are used to assess the liquefaction potential of soil. In this paper, the deterministic methods of Idriss and Boulanger are used to define the limit state function. The probability of liquefaction is estimated using the reliability index calculated using the first order reliability method (FORM). The statistical characteristics of the model uncertainty of Boulanger and Idriss model based on CPT are determined through an extensive reliability analysis using Bayesian mapping function calibrated with a set of quality case histories. The case study is from a site to the north of Beirut where the two tests are executed in boreholes distant of 1m. This allowed a comparative study based on the probability of liquefaction obtained from the two in-situ tests. The effect of the coefficient of variation of different parameters of the CPT on the probability of liquefaction was examined.