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This paper describes a proposed methodology to evaluate the risk of “sudden failure” that can be experienced by a soft cohesive soil when subject to combined static and dynamic loading. The method is based on the results of a comprehensive experimental research program comprising 155 cyclic simple shear tests. In most tests, prior to the dynamic shear stresses (τc), different levels of monotonic bias shear stresses (τo) were applied. Laboratory tests were performed on undisturbed specimens recovered at the port of Barcelona, Spain. In general, the results thus obtained indicate that by means of simple correlations among the stiffness modulus (G), the effective vertical consolidation stresses (σ’ov), the cyclic strains (γc) and the number of cycles (N), it is possible to combine families of curves that make it possible to evaluate the risk of “sudden failure”, for different cyclic shear stress ratios (CSR) equal to (τc/σ’ov).
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