The Bearing Capacity Character of Enlarged Base Shallow Foundation under Uplift Load

Abstract

By theory analysis and field tests, failure model of soil around foundation and ultimate uplift resistance of enlarged bass shallow foundation were analyzed. The results showed that the deformation and failure process of soil around foundation under uplift load undergone three phases: 1) soil upon enlarged base compressed, 2) appearance and extension of plastic zone of soil around foundation, and 3) soil around foundation general shear failure. With the combination of the Limit Equilibrium Method, and Sliding Curve Theory, a simplified theory model to calculate net ultimate uplift resistance of shallow foundation assuming cir failure surface under uplift load was established. Then three examples were calculated by this method and the good agreement between theory calculation solution and experimental results validated the rationality of the model. The study in this paper provided an important theoretical support and brand-new idea on calculation method of uplift capacity of foundation with enlarged base and failure surface characteristics determination of soil around foundation.

Development on Environmental Geotechnology for Overhead Transmission Line Foundation Engineering in China

“…The shaft of a belled pier foundation is cylindrical, terminating at its base in circular slab of greater diameter than the shaft. It may be constructed well in situ to utilize the enlarged base to exert considerable resistance against the tensile load [5]. However, in some cases, the overlying stratum soil is too shallow to be used for the construction of the belled pier foundation.…”