Abstract
(a) A specimen can collapse under a drained condition if the test is conducted under a load-controlled loading mode as shown and discussed in detail by Chu & Leong (2003a, 2003b) and Chu & Wanatowski (2009). (b) By confining the conclusion to ‘fully drained conditions’, the discussers would assume that the author considers that instability under ‘fully undrained conditions’ involves collapse or loss of strength. This is also an observation made by a number of researchers (e.g. Lade & Pradel, 1990; Lade, 1992, 1993; Sasitharan et al., 1993; Leong et al., 2000; Chu & Leong, 2003a, 2003b; Chu et al., 1993, 2003; Chu & Wanatowski, 2009). As the author did not specify otherwise, the discussers assume that the term ‘drained’ is used to refer to a condition where water is allowed to flow in or out of the specimen under a constant back pressure condition. Under such drained condition, the effective confining stress or the effective stress path can be controlled by varying the cell pressure. With today’s laboratory testing techniques, it is possible to carry out a special ‘drained’ triaxial test to trace the curved effective stress path followed in an undrained test in which the specimen has collapsed. Assume this special test is conducted under a load-controlled loading mode, would the specimen in this test collapse or not? If it would, then this collapse is under a drained condition. If it would not, then what are the other factors that control the collapse in addition to the effective stresses?
Published Version
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