UNCONFINED COMPRESSION TEST
8. Shear the sample at a strain rate of 1% per minute. Typically, the sample fails in one of two ways. In stiffer clays, a distinct failure plane forms. For this type of failure, it is likely that the point of failure will be indicated by the measurement of a peak and then a decrease in load.
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UNIT 8 STRESS DISTRIBUTION - cyut.edu.tw
www.cyut.edu.twThe geometry of the problem is shown in Fig. 8.2. For most practical analyses of the settlement behavior of soils, it is assumed that the volume of the soil is controlled exclusively by the vertical stress, σz. The vertical stress is given by: σz = 3P 2π z3 R5 = 3P 2πR2 cos3 β = I P z2 (8.1) where I is termed an influence factor.
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