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Dear Namazi If you construct matrices you will get the coeficients needed in the equation. Moduli of elasticity for soils is never linear and tends normally to increase with tension. A 2.d degree equation attend the most cases. The elastic moduli is too often simplified and it is my meaning that it better should be represented by an equation - because the authors of publications seldom tell us HOW the moduli is developed and without that information, there is always a possibility of abuse. For more details for portuguese and spanish users, I refer to my 2 papers publicated in the annais of 32a Reuniao Anual de Pavimentaçao, Associaçao Brasileira de Pavimentaçao Brasília - DF, Brazil, October 2000. Regards, Thomas Ulf Nilsson [log in to unmask] www.nilsson.com.br --- =?iso-8859-1?q?Samad=20Namazi?= <[log in to unmask]> > wrote: >Dear every body, > >How we can determine subgrad reaction modulus from >load settlement curve in plate load test? >I.e. which portion of load settlement curve consider >until the effect of depth on subgrad reaction in >coarse grained soil neutraed or decrease. > >Regards, >Namazi _____________________________________________________________ Are you a Techie? Get Your Free Tech Email Address Now! Visit http://www.TechEmail.com