Abstract:Consolidation coefficient is a key problem in the calculation and design of foundations,and it is very important to gain consolidation coefficient accurately. Piezocone penetration test(CPTU) and BAT-system are the equipments which can gain the in-situ consolidation coefficient rapidly and accurately. Based on the spherical cavity expansion and one-dimensional consolidation,an analytical solution of consolidation around a spherical cavity is obtained,and the solution is used to analyze the dissipation of the excess pore water pressure around the probe tip of CPTU and BAT-system. Finally,the comparison shows that the analytic result is close to the in-situ value of excess pore water pressure. The deduced results show that the solution is valuable for the in-situ test of consolidation coefficient.