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A comparison of the first normalized shear stress-strain loop obtained for the reconstituted Fraser River silt specimens during the constant-volume cyclic DSS tests with a CSR of about 0.14, at four different loading periods of 5 s, 10 s, 100 s, and 1000 s. [AL -Area of the stress-strain loop, AT = Area of the triangle, D = Equivalent viscous damping factor derived from AL and AT]

A comparison of the first normalized shear stress-strain loop obtained for the reconstituted Fraser River silt specimens during the constant-volume cyclic DSS tests with a CSR of about 0.14, at four different loading periods of 5 s, 10 s, 100 s, and 1000 s. [AL -Area of the stress-strain loop, AT = Area of the triangle, D = Equivalent viscous damping factor derived from AL and AT]

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Figure 3. Normalized shear stress-strain [I] and excess pore-water...
Figure 4. Normalized shear stress-strain [I] and normalized stress path...
Figure 5. Development of excess pore-water pressure [I] and...
Figure 8. A comparison of the first normalized shear stress-strain loop...
Summary of test program
Observations on the effect of strain rate and loading rate on monotonic and cyclic direct simple shear response of reconstituted Fraser River silts
Conference Paper
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  • Oct 2019
The influence of the shearing rate on the response of sand as well as clay has been investigated and well-documented; however, such investigations on silt, especially the studies on the effects of strain/loading rates in the available literature is very limited. With this background, a series of constant-volume direct simple shear tests were conduc...
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Context 1
... expected, it was observed greater level of strains occurs specially at the peak and the trough of the sinusoidal waves, when the loading period is higher as 100 s and 1000 s. The first normalized shear stress-strain loop obtained from the reconstituted Fraser River silt specimens with four different loading periods of 5 s, 10 s, 100 s, and 1000 s are presented in Figure 8. These loops can be studied in an approximate way with respect to hysteresis characteristics to assess the variation of damping of silt specimens under different loading periods. ...
Context 2
... loops can be studied in an approximate way with respect to hysteresis characteristics to assess the variation of damping of silt specimens under different loading periods. The stress-strain loops shown in Figure 8 suggest that the area enveloped inside the hysteresis loop, AL, seem to increase with increasing loading period. ...
Context 3
... equivalent viscous damping factor, D, for the silt can be estimated from the energy dissipated and stored ratio during the cyclic loading cycle in according to the Equation [4]. As shown in Figure 8, the computed values suggest that higher loading periods resulted in greater D. It also suggests the loading frequency dependency of silt behavior, as the same reconstituted material exhibit different strain accumulation and damping characteristics, when they were subjected to cyclic loading with different frequencies (when sheared under a similar loading amplitude of about 0.14). ...