DETERMINATION OF CONSOLIDATION COEFFICIENT BY PIEZO-CONE PENETRATION TEST

The dissipation tests of excessive pore water pressure have been conducted in the soft soil region of the Zhujiang delta in order to discuss the feasibility and principle of determining the consolidation coefficient of the soft soil by means of the piezo-cone penetration test (CPTU). In this paper, the testing sites, equipment and methods are briefly described, with an emphasis on analysis of the testing mechanism and results. Moreover, the comparison is completed of the estimation of the consolidation coefficient by means of the pore pressure dissipation test with the trial values obtained from the indoor consolidation experiment and the inverse value of the in-situ subsidence records. As a result, a very good pattern is located among these three. In addition, the consolidation coefficient determined by CPTU is more approximate to the real coefficient.