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Volume 6 – Geotechnical Manual, Site Investigation and Engineering ...

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Chapter 5 INTERPRETATION OF SOIL PROPERTIES<br />

Figure 5.17 Relationship Between Pre-consolidation Stress <strong>and</strong> DMT Effective Contact Pressure in<br />

Clays<br />

Figure 5.18 Relationship between Preconsolidation Stress <strong>and</strong> Shear Wave Velocity in Clays.<br />

(Data from Mayne, Robertson, & Lunne, 1998)<br />

5.4.3 Undrained Strength of Clays <strong>and</strong> Silts<br />

The undrained shear strength (s u or c u ) is not a unique property of soils, but a behavioral response<br />

to loading that depends upon applied stress direction, boundary conditions, strain rate, overconsolidation,<br />

degree of fissuring, <strong>and</strong> other factors. Therefore, it is often a difficult task to directly<br />

compare undrained strengths measured by a variety of different 1ab <strong>and</strong> field tests, unless proper<br />

March 2009 5-17

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