Analytical Chem Soil HW Solutions 75

Analytical Chem Soil HW Solutions 75 - = 1.02, p' = 300 +...

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75 0 20 40 60 80 100 120 140 160 0 50 100 150 200 250 300 p, p' (kPa) q (kPa) Total stress path Yield Failure 3 1 Figure Q5.6b: q against p and p'for sample 2 From the data for the first sample, we can say that for the second sample at yield, p' = 229 kPa; q = 78.3 kPa at failure, p' = 133.7 kPa; q = 136.5 kPa (d) If the first sample had been subjected to a drained test, it would have followed the total stress path with u = 0, p' = CP + q/3 = 300 + q/3 kPa. It would reach the critical state line (CSL) when q = Μ .p' and p' = 300 + q/3, or with
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Unformatted text preview: = 1.02, p' = 300 + 1.02p'/3 p' = 454.4 kPa; Hence q = 463.6 kPa For a soil of this type (a normally consolidated or lightly overconsolidated clay), failure may occur during rapid (ie undrained) loading which could have been avoided if the load had been applied in smaller increments allowing drainage and consolidation to occur. An example of this is in the stage construction of embankments on soft clay, mentioned in the mein text in Section 4.3 (Figure 4.10)....
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