Approach on the Engineering Properties of Lianyungang Marine Clay from Piezocone Penetration Tests

The use of the piezocone test (CPTU) in geotechnical site investigation offers direct field measurement on stratigraphy and soil behavior. Compared with some traditional investigation methods such as drilling, sampling, field inspecting method, or laboratory test procedures, CPTU can greatly accelerate the field work and thereby reduce corresponding operation cost. This article reviews previous interpretation methods of obtaining undrained shear strength, overconsolidation ratio, and coefficient of consolidation of soft soils from CPTU data, and introduces a new method, which the measured pore pressure into account. Piezocone tests with Vertek-Hogentogler CPTU truck have been complemented in a widely explored area in the soft marine deposit of Lianyungang City. Geotechnical design parameters (q t , f s , and u) obtained from CPTU and dissipation tests are evaluated for the marine clay in this area through methods based on cavity expansion (CE) and critical state (CS) theory proposed by Mayne, and compared with the result of vane shear tests and laboratory tests of undisturbed soil samples. Comparison of the results reveals the validity of CPTU tests to interpret the engineering properties of Lianyungang marine clay.

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