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External stability of waterfront reinforced soil structures under seismic conditions using a pseudo-static approach

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Title External stability of waterfront reinforced soil structures under seismic conditions using a pseudo-static approach
 
Creator CHOUDHURY, D
AHMAD, SM
 
Subject horizontal slice method
retaining wall
tsunami reconstruction
pseudodynamic method
design
earthquake
slopes
parameters
geosynthetics
waterfront
seismic
reinforced soil
retaining structure
external stability
direct sliding
overturning
 
Description This paper presents an analysis of the external stability of a waterfront reinforced soil retaining structure. Such structures, in addition to being subjected to normal hydrostatic pressures, are also subjected to earthquake, which gives rise to additional seismic inertia forces and hydrodynamic pressure. Simple pseudo-static approaches are adopted to calculate the seismic inertia forces on the waterfront retaining structure, and a conventional approach is used to estimate the hydrodynamic pressure. The failure wedge is considered to be confined by a planar rupture surface. The results are presented for direct sliding and overturning failure modes of the retaining structure (including results for sloped and vertical walls). By considering all combinations of forces, generalised expressions are developed for the length of geosynthetic reinforcement needed to counter these two modes of failure. The expressions are fairly simple, and can be used directly by practising engineers for the design of waterfront reinforced soil structures. The required geosynthetic length in the direct sliding mode increases from 0.56H to 5.02H when the horizontal seismic acceleration coefficient is increased from 0 to 0.3. It has also been found that, of the two modes of failure, the direct sliding mode is critical. In addition, the requirement for geosynthetic reinforcement for a slope angle of 60 degrees to the horizontal is greater than that needed for a vertical wall (i. e. with a slope angle of 90 degrees). A parametric study is also presented. In addition to the horizontal seismic acceleration coefficient, the downstream water height, pore pressure ratio and soil friction angle all have a significant effect on the sliding and overturning stability of the waterfront retaining structure. Comparison of the present methodology with a previously existing methodology, but for the dry case, shows a close match.
 
Publisher THOMAS TELFORD PUBLISHING
 
Date 2011-09-01T07:03:12Z
2011-12-26T12:59:32Z
2011-12-27T05:51:48Z
2011-09-01T07:03:12Z
2011-12-26T12:59:32Z
2011-12-27T05:51:48Z
2009
 
Type Article
 
Identifier GEOSYNTHETICS INTERNATIONAL, 16(1), 1-10
1072-6349
http://dx.doi.org/10.1680/gein.2009.16.1.1
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12697
http://hdl.handle.net/10054/12697
 
Language en