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determing preconsolidation pressure - alternate method

drt (Geotechnical) (OP)
18 Apr 02 19:52
I remember their being "another" method to determine the preconsolidaton pressure, other than Casagrande's emprical construction method.  Either this method is commonly used in Brazil or the person who developed the method is Brazillian.  ANyways, this method doesn't rely on picking the point of maximum curvature by eye, its more mathematically based.  I think the method is called the Pashako Silva(??) method.

Just wondering if anybody can describe the methodology or give a reference to a paper where it can be found.

Thanks

ishvaaag (Structural)
19 Apr 02 13:20
I may have seen this or akin somewhere but don't remember. Yet a Google search gives lots of links and you may find there what you are searching for

http://www.google.com/search?q=Silva+Clay+Consolidation&hl=es&btnG=B%FAsqueda+en+Google&lr=

coneboy (Geotechnical)
19 Apr 02 13:22
To Drt

A second method of determining the pre-consolidation pressure that comes to mind involves the use of the electric cone (CPT) and Schmertman's method.  Basically this method looks at the Su/effective overburden stress of the soil and compares it a similar ratio for a normally consolidated soil.  
Doing a internet search on Schmertmann and/or CPT on the net should get you started.  In addition, I know Matt Kokan wrote a in depth article for the Vancouver Geotech society a few years ago on this subject.

Best of luck
Coneboy
Riz (Structural)
8 May 02 9:32
The swelling potential of sample in the oedometer and the load required to carry out subsequent stress loading does accurately give you the preconsolidation pressure. Its a very reliable method for over consolidated soils.
gita (Structural)
27 May 02 12:52
A non-mathematical method and possibly a non-proven method is to obtain it using another graphical approach. But, this requires the computation of Cv vs. effective stress which should plot as a "V"; the bottom of the V is approximately the pre-consolidation pressure.
Siva
Guest (visitor)
31 May 02 16:56
Soy estudiante de Tesis para Ingenierio Civil de la Universidad de La Serena en Chile. Parte de mi trabajo consiste en determinar la presión de pre-consolidación de las arcillas de la zona con la utilización de métodos de la geotecnia.
El método que más se usa para esto es el de Casagrande, pero además de este debo utilizar los siguientes:

Métodos de determinacón directa:- Jambu
                                - Tavenas


Métodos de determinación gráfica: -Schmermann
                                  -Butterfield
                                  -Old
                                  -Van Zelst

Solicito respetuosamente quien pueda proporcionar información o apuntes sobre como se utilizan cada uno de estos métodos y como se grafican para poder determinar la presión de preconsolidación.

     Sin Otro particular atentatamente

          
                   marcargut@hotmail.com







Guest (visitor)
31 May 02 16:59
Soy estudiante de Tesis para Ingenierio Civil de la Universidad de La Serena en Chile. Parte de mi trabajo consiste en determinar la presión de pre-consolidación de las arcillas de la zona con la utilización de métodos de la geotecnia.
El método que más se usa para esto es el de Casagrande, pero además de este debo utilizar los siguientes:

Métodos de determinacón directa:- Jambu
                                - Tavenas


Métodos de determinación gráfica: -Schmermann
                                  -Butterfield
                                  -Old
                                  -Van Zelst

Solicito respetuosamente quien pueda proporcionar información o apuntes sobre como se utilizan cada uno de estos métodos y como se grafican para poder determinar la presión de preconsolidación.

     Sin Otro particular atentatamente

          
                   marcargut@hotmail.com







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