دانلود رایگان مقاله انگلیسی تحقیقات عددی بر روی سطح عملکرد فونداسیون سطحی تعبیه شده در شن و ماسه - الزویر 2018

abstract

This paper presents a numerical study on the drained response of a shallow foundation subjected to planar combined loads. Plane strain conditions are assumed and different initial foundation depths and values of vertical penetration are considered. Data from centrifuge experiments of surface and buried foundations available in literature, are used to assess the ability of the model to reproduce the essential features of the experimentally observed behaviour. Interpreted within the context of existing workhardening plasticity models applied to the soil-foundation system and presented in terms of load–displacement curves and load paths, the results of the numerical analyses provide new evidence of the effects of the embedment on the yield surface for a shallow foundation.

5. Concluding remarks

Within the context of work-hardening plasticity models of the soil-foundation system, the paper has presented a numerical study of the embedment effects on the yield surface for a shallow foundation in sand. The numerical approach was validated based on data from centrifuge tests available in literature, across a practical range of foundation initial depth, d, mobilised vertical load, V0, and combined load paths. The comparison has proved the model able in reproducing the experimentally observed foundation response to combined loading. The study has shown that, for a shallow foundation embedded in sand:

 the yield surface which is established in the load space is essentially parabolic in planes containing the V axis, with elliptical, anticlockwise rotated, sections with planes at constant V;

 existing equations of the yield surface for the soil-foundation system still work well, but modifications need to be introduced to account of effects of the embedment, which are not negligible;

 the extent and rotation of the normalised yield surface are function of the embedment as produced by the coupled effect of the foundation initial depth, d, and mobilised penetration, w.