SOIL STRENGTH PROPERTIES AND THEIR MEASUREMENT

LChapter 12 TIEN H. Wu SOIL STRENGTH PROPERTIES AND THEIR MEASUREMENT 1. INTRODUCTION Methods of limiting equilibrium are fre-quently used to analyze the stability of a soil mass (see Chapter 13). In such analyses, the shear STRENGTH of the material is assumed to be fully developed along the rupture surface at fail-ure. In this chapter the basic principles that gov-ern shear STRENGTH and the methods that may be used for its MEASUREMENT are outlined. Brief descriptions of the PROPERTIES of some common soils are provided. PRINCIPLES The basic principles in the description of STRENGTH PROPERTIES are the failure criterion and the effective stress principle. '(lhen a failure criterion derived from testdata is used to estimate in situ STRENGTH , appropriate attention should be given to possible differences between the stress state of the test and that of the in situ soil when subjected to the expected load.)

In terms of principal stresses, the Mohr-Coulomb criterion becomes a1 = a3 [( tan 2 !t' +2ctan[(.!) + ()] A (12.2) a4 + ( 2 )] 4 2 where a1 is the major principal stress and a3 is the minor principal stress. A more general formulation, which combines failure with stress-strain behavior, is …

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  Measurement, Their, Properties, Strength, Stresses, Strength properties and their measurement

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