Bearing capacity of shallow foundations considering inclinations of load and bearing stratum

摘要

In this paper, the property and applicability of bearing capacity equation are investigated in order to evaluate the bearing capacity characteristics of shallow foundation during earthquake. It uses dynamic model for seismic coefficient method and failure mechanism according to admissible velocity field method. Results are summarized as follows. 1) A multi-usable bearing capacity equation is proposed. It assumes failure mechanism that considers inclinations of load and ground, and applies admissible velocity field method. Using this equation, evaluation of bearing capacity becomes possible, considering the degree of inertia force acting on superstructure and bearing stratum. 2) Based on bearing capacity test results of two-dimensional model, bearing capacity coefficient N_γ decreases according to inclinations of load and ground, similar to results of past studies. The rate of decrease becomes large as inclination angle increases. 3) The usability of proposed equation is confirmed since the decrease of bearing capacity coefficient due to the equation agrees with that of test. 4) In regards to reduction rate of bearing capacity N_γ, the effect of load inclination is greater than that of ground inclination. Furthermore, reduction rate becomes slight bigger in the case when inclinations of load and ground are both considered, compared to the case when only inclination of load is considered.