A Study on the Bearing Capacity Alteration of Shallow Foundation Resting on Anzali Sand after Applied Cyclic Loading

Laboratory cyclic loading tests have been employed as a basis to understand the post shaking bearingcapacity of Anzali Sand.Bearing capacity of foundations has been always one of the most challenging research subjects in the field of geotechnical engineering. In this paper, the experimental investigation is aimed to obtain a better understanding of the post liquefied behavior of Anzali Sand and alterationof the bearing capacity of shallow foundations on resting on it. For this purpose, two series of testswere carried out before and after the event of cyclic loading to simulate this phenomenon.Samples of sand tested in this study were collected and transferred from AnzaliPort which is located in an area potentially prone to moderate to intensive seismic risk. Liquefaction or limited liquefaction was modeled in a glass tank at the University of Guilan soil laboratory. Cyclic loading tests were performed under different conditions, i.e. relative varying densities, duration of shaking and frequency of cyclic loads. A series of bearing capacity tests of centrally loaded model footings at circular and strip foundation were performed. Reduction or increase in the volume of the specimens with the dissipation of the excess pore water pressure thus built-up and alternation of the bearing capacity of shallow foundationswith respect to the initial (reference) condition, were studied.Results indicate a relationship between the bearing capacities corresponding to the initial state of the soil from which, the cyclic loading starts.

Keywords:

Anzali Sand , Strip Foundation , Frequency , Shaking Test