科研之友
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摘要
In order to investigate the shear yield characteristics of structured granite residual soil, a series of conventional triaxial drained tests are conducted on the undisturbed granite residual soil, remolded soil and cemented residual soil.From the test results, some insights can be obtained as follows.For undisturbed granite residual soil and cemented residual soil, the bond yield point during shearing could be identified on the curve of the normalized tangential stiffness Etan/p' versus axial strain in log-log scale.The consolidation pressure P'0 has a significant influence on the shear yield characteristics of undisturbed granite residual soil and cemented residual soil during shearing; the bonds inside structured soil tend to be damaged relatively more seriously as P'0 is higher; accordingly the initial normalized stiffness will be smaller at the beginning of the shearing process; and the axial strain at the bond yield point will also be smaller.Besides, it can be concluded that once P'0 excesses a critical value, the bonds inside soil will be damaged totally; in this case, there will be no bond yield occurring during shearing; and the Etan/p'-εa curves will be coincided with the ones ofremolded soil.For remolded soil, no bond yielding is observed during shearing, the Etan/p'-εa curve is nearly constant with no dependence of the value of P'0.
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