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Preconsolidating

We evaluated five methods for estimating σp from standard soil compression curves for an applied stress sequence of 25, 50, 100, 200, 400, 800, and 1600 k Pa.

Four methods estimated σp as the intersection of two lines: (a) the regression line obtained for the first two, three, four or five points of the applied stress sequence in the secondary compression portion of the compression curve and (b) the extension of the virgin compression line determined from the points associated with applied stress of 8 k Pa. The σp determined for each method was compared to σp estimated using the graphical procedure of Casagrande for 288 soil compression curves from three soils in Michigan and from values reported in the literature.

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Furthermore, there is not a widely accepted, quantitative method in order to assess sample disturbance and treat the lab engineering values to match the "in-situ" properties of the soil.

This research consists of a systematic review of the methods available to estimate preconsolidation pressure and sample quality.

Uni Settle offers the input option of the "preconsolidation margin" which was proposed by Bengt H. Most people report only the "overconsolidation ratio" (OCR) of a soil, determined, say, from a oedometer test.

Are there conditions that would make using OCR produce more realistic settlement calculations and vice versa?Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Can you provide me some hints about compressibility data for granular soils or those on which I cannot perform an odometer tests? Actually, most of the time, the compressibility for the full range of added load lies in the re-compression region.The factor used to determine the undrained shear strength was estimated to be K//b equals 5.A re-analysis of the Richmond City Hall mat settlement has been performed to confirm the pressuremeter rheologic coefficient alpha equals 1 as suggested by Menard for preconsolidated clay soils.

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1987) on the compression curve and the preconsolidation pressure is quantified.

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