Finite Element Calculation of Foundation Shear Strength During Large-Scale Caisson Height Connection
In order to explore the problems of sudden settlement and partial settlement of large caissons on soft soil foundation with low strength and time-varying effect,the ABAQUS finite element software was used to simulate the elevation process of the first three sections of the caisson in the south anchor of Nanjing Longtan Bridge,and the dissipation of superstatic pore pressure in the caisson foundation was observed,and the changes of its shear strength were calculated and compared by the standard method and the effective stress method.The results showed that during the maintenance of caisson concrete,the superstatic pore pressure dissipated rapidly,the shear strength of the foundation was improved,the strength of the shallow part was greatly improved,and the deep part was attenuated;whether the caisson could be poured in the next section was not controlled by the dissipation time of the superstatic hole pressure,but was mainly controlled by the curing of the concrete;the shear strength calculation result of the standard method was larger than that of the effective stress method,and the effective stress method could be used to calculate the strength growth in engineering practice.
large caissonsoft soil foundationfinite element simulationseepage consolidationshear strength
万方数据
维普
