It's true. Andosols are susceptible moisture content. But the rainfall can
rise the moisture content quickly here. So, the break of conductions is very
frecuently.
Other problems and the volcanic islands are geotechnical parameters in the
soft rocks, p.e. ignimbrites, piroclastic surge, ash and pumice and other
types of rock-soils. These materials is impossible know the geotechnical
parametes because I can't test in the soil laboratory. Anybody can help me?
Thank you.
José María Morales
----- Original Message -----
From: "David Toll" <[log in to unmask]>
To: "'ICINCO LAS PALMAS'" <[log in to unmask]>;
[log in to unmask]
Sent: Tuesday, April 24, 2001 9:33 AM
Subject: RE: Volcanic soils
> It is worth re-emphasising the point made by Jason concerning the effects
of
> drying on measuring moisture content - and clearly this affects the index
> properties. Andosols, allophane-rich and halloysitic soils found in
volcanic
> regions are particularly susceptible. Soils that have liquid limits of
well
> over 100 when tested in their natural state appear to be non-plastic when
> they have been oven dried. Therefore it is meaningless to quote Atterberg
> limits without specifying the method of preparation. Mixing times during
> specimen preparation also affects the results (see for example, Newill, D.
> (1961) Geotechnique, 11, pp 302-318). Similar problems are found with
other
> basic properties, such a determining clay fraction.
>
> David Toll
> ------------------------------------------------------------
> Dr David Toll
> University of Durham
> School of Engineering
> South Road
> Durham, DH1 3LE, UK.
> Tel: (+44/0) 191 374 2566 Fax: (+44/0) 191 374 2550
> e-mail: [log in to unmask]
> www: http://www.dur.ac.uk/~des0dt/
> -----Original Message-----
> From: Geotechnical Engineering Email List
> [mailto:[log in to unmask]]On Behalf Of ICINCO LAS PALMAS
> Sent: 23 April 2001 18:45 PM
> To: [log in to unmask]
> Subject: Volcanic soils
>
>
> Hi! I work in the Canary Islands. These islands are volcanics and I don't
> find information about the parameters of th geotechnical soils and rocks
> (basalts, piroclastics, expansive clays and other soft rocks). It's very
> difficult the clasification of this materials!!!
>
> Thank you
>
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