Overview
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ABSTRACT
For the design of geotechnical structures, the calculation parameters of the models can be determined in the laboratory on specimens cut from core samples or in a borehole by performing in situ tests. Once the properties have been determined, it is necessary to synthesize the information and data collected to develop the geotechnical model with a controlled risk. One way to limit this risk is to use correlations to estimate the quality of the collected data sets by making comparisons. This article outlines the basics that the engineer must know when developing these relationships and presents some semi-empirical relationships or correlations linking these parameters. This article outlines the basics that the engineer needs to know when developing these relationships and presents some semi-empirical relationships or correlations linking these parameters.
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Philippe REIFFSTECK: Research Director - GERS-SRO, Gustave Eiffel University, IFSTTAR, Champs-sur-Marne, France
INTRODUCTION
A wide variety of parameters are used to describe the physical and mechanical properties of soils:
identification and state parameters (porosity, void index, density, relative density, Atterberg limits, etc.);
deformability parameters (compression and swelling indices, odometric modulus, pressiometric modulus, etc.);
resistance parameters (cohesion and angle of internal friction, pressuremeter limit pressure, static or dynamic cone resistance, etc.);
permeability parameters.
It is very rare for all these parameters to be measured at a sufficient number of points on a given site to be able to assess the entire soil mass. Usually, geotechnical reconnaissance is limited to the strict minimum, with values of some parameters available at some points and other parameters at others. The geotechnical engineer has to make the most of this scattered information and draw up a geotechnical cross-section representative of the site under study.
It is within this general framework that the use of correlations between the physical and mechanical properties of soils can make an effective contribution to the geotechnical engineer's synthesis work.
This article explains how such relationships can be established, and gives some examples of correlations between parameters derived from laboratory tests and in-situ tests.
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KEYWORDS
geotechnical engineering | Correlation | soils |
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Soil mechanics and geotechnics
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Correlations between soil properties
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