Talk:Shear strength (soil)
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[edit] Missing points
Two points seem missing in this article. Cohesion is not a function of negative pore pressure; it is caused by diagenetic forces between the solids in soil. Apparent cohesion is caused by negative pore pressure; that force dissipates as the negative pore pressure is satisfied and the soil shifts to the drained condition. Secondly, φ is the internal friction angle. It is not a resistive force. The resistive force from the friction angle is N*tan(φ); the resistance is proportional to the overburden pressure, N.
The term 'angle of internal friction' is prevalent in older literature, but is slightly misleading. The phi angle in soils is brought about by a more complex interaction of particles than the term 'friction' suggests, particularly in cohesive soils, but also in granular soils, where confining pressure, initial density, particle shape and angularity, orientation of particles, and physico-chemical effects such as cementation and bonding influence the phi angle, and ultimately the shear strength of a soil. A more 'correct' and generic term which should be used is 'angle of shearing resistance', as it encompasses all these effects not merely Coulomb friction. In the least, Friction should link to the main Wikipedia friction page: http://en.wikipedia.org/wiki/Friction I'd suggest shear strength be expanded or carefully linked to other pages that cover failure criteria; Linking to pages on Mohr-Coulomb Theory http://en.wikipedia.org/wiki/Mohr-Coulomb_theory, and for undrained shear strength, Tresca http://en.wikipedia.org/wiki/Henri_Tresca. Plasticity, http://en.wikipedia.org/wiki/Plasticity_%28physics%29, and Yield http://en.wikipedia.org/wiki/Yield_%28engineering%29 as general concepts for defining shear strength. But individual pages specific to shear strength of soils (for example) could be created, since there is much to expand on in this area. GeoEng 09:05, 11 March 2007 (UTC)
OK I decided I had nothing better to do, and had a go at editing this page (my first time editing on wikipedia, so dont shoot me). I have added non-existent links to Critical State Theory and Modified Cam Clay, in the hope someone (maybe me) will write entries on these. This article needs references I know. And links to similar articles. GeoEng 18:37, 11 March 2007 (UTC)
- Thanks for your contributions; I'll try to help you out if I have time. Basar 19:53, 11 March 2007 (UTC)
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- Added some references and further info relating to cohesion and friction from those references. Really its just one actual reference at this stage (ref 2) by Prof. Schofield, and the others are cited in that document. May add some stuff from Prof. Burland if I get around to it, on 'post rupture' strength. This document needs some figures... i'll need to get around to those as well:) —The preceding unsigned comment was added by GeoEng (talk • contribs) 00:43, 18 March 2007 (UTC).
[edit] Move soils information
It seems to me that shear strength of soils should have its own article, perhaps shear strength (soil) or shear strength of soil. I'll move it if no one objects. Basar 19:53, 11 March 2007 (UTC)
- Good idea. Still need to leave the basics at this site with a "Main article" link. I have a preference for Shear strength (soil), but, eh, no big yank one way or t'other. ZueJay (talk) 20:05, 11 March 2007 (UTC)
