Numerical Analysis and Model tests of the Bearing Capacity of shallow Strip Footing resting on Multi-layered Soils


Abstract in English

In present investigation attempt has been made to study the bearing capacity and settlement characteristics of footings subjected to central vertical load and resting on layered soil with the help of model tests and with the application of finite element method (FEM) to calculate bearing capacity of a strip footing on one-layer and two-layer soil (Sand and Clay). To investigate the effect of various parameters on soil bearing Capacity a commercial finite element software, PLAXIS, has been used. Soil profile contains two soil types including sand and clay. Soil behavior is represented by the elasto-plastic Mohrcoulomb (MC) -model. For a one-layer case, the bearing capacity also is calculated which has a good agreement with theoretical equations. For a layered soil, soft-over strong soil, parametric study was carried out. It is concluded that the bearing capacity of footing decreases as the height of clayey soil increases whilst the displacement under footing increases. There is a critical depth where the stronger bottom layer does not affect ultimate bearing capacity and failure mechanism of footing.

References used

BOWLES, J. E. "Foundation Analysis and Design". 6th. ed., McGrow-Hill International Editions, (1998)
HANNA, A. M. & MEYERHOF, G. G. "Design Chats for Ultimate Bearing Capacity of Foundations on Sand Overlying Soft Clay ". Candian Geotechnical Journal, Vol. 17, n.2, (1980), pp.300-303
HANSEN, J. B. "A revised and extended formula for bearing capacity". Danish Geotechnical Institute, Copenhagen, In: Bulletin No. 28, (1970), pp. 5-11

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