The bearing capacity factor Nγ was determined for both smooth and rough ring footings using the method of stress characteristics. The analysis was based on the assumption that for a rough footing the friction angle (δ) between the footing base and underlying cohesionless material increases gradually from zero along the axis of symmetry to ϕ along the outer edge of the footing. The value of Nγ was found to decrease significantly with an increase in ri /ro, where ri and ro are the inner and outer radii of the ring, respectively. For larger values of ϕ, the magnitude of Nγ for a rough footing was seen to be significantly higher than that for a smooth footing. The obtained results were compared with those available in the literature.Key words: bearing capacity, failure, foundations, method of characteristics, plasticity.
This note describes a study on the seismic active earth pressure behind a nonvertical cantilever retaining wall using pseudo-dynamic analysis. A planar failure surface has been considered behind the retaining wall. The effects of soil friction angle, wall inclination, wall friction angle, amplification of vibration, and horizontal and vertical earthquake acceleration on the active earth pressure have been explored in this study. Unlike the Mononobe–Okabe method, which incorporates pseudo-static analysis, the present analysis predicts a nonlinear variation of active earth pressure along the wall. The results have been compared with the existing values in the literature.
This paper presents an experimental study on the dynamic interaction effect of closely spaced square foundations under machine vibration. Under dynamic condition, a number of large-scale model tests were conducted in the field, which include a wide range of study on the isolated as well as the interacting footing response resting on the local soil available at Kanpur, India. The dynamic interaction of different combinations (size) of two-footing assembly was investigated by inducing vertical harmonic load on one of the footings (active footing), where the other footing (passive footing) was loaded with the static weight only. The active footing was excited with different Page 1 of 41 Can. Geotech. J. Downloaded from www.nrcresearchpress.com by CAMBRIDGE UNIVERSITY LIBRARY on 08/18/15 For personal use only. This Just-IN manuscript is the accepted manuscript prior to copy editing and page composition. It may differ from the final official version of record.2 magnitudes of dynamic loading and the response was recorded for both the footings, placed at different clear spacing (S). The results are compiled and shown as the variation of displacement amplitude with frequency. The transmission ratio, which predicts the effect of dynamic excitation of the active footing on the passive one, is determined for the interacting footings and plotted with respect to the frequency ratio.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.