Application of CPT Cone Resistance for Footing Bearing Capacity Estimation

摘要

In this paper, application of the CPT cone resistance (q_c) for footing bearing capacity estimation is examined. The analysis focuses on axially loaded circular footings bearing on sand. The approach proposed in this study can reduce the uncertainties associated with the bearing capacity equation, as no estimation of φ or selection of an equation for N_γ is necessary. Instead, normalized limit unit bearing capacities q_(bL)/q_c are calculated from non-linear finite element and cone penetration resistance analyses for various soil and footing conditions. Based on results in this study, a method for estimating q_(bL) directly from the CPT cone resistance (q_c) is proposed. Effects of the relative density (D_R), the lateral earth pressure ratio (K_0) and the footing size are also addressed. There is a size effect on the values of q_(bL)/q_c. The size effect increases as the footing diameter B increases.