CGRG Bibliography of Canadian Geomorphology
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Author : Burak, J.P.
Date : 1986.
Title : Shallow downslope movements due to drained cyclic pore pressure changes
Publication : Unpublished M.Sc. thesis. Lakehead University, Thunder Bay, Ont
Issue :
Page(s) :
Abstract
This thesis investigates the effect of cyclic pore pressures on soil with regards to its deformation behaviour. The observed behaviour is then correlated to actual field conditions in which shallow, slow ground movements have been measured. The effect of fluctuating porewater conditions on slow ground movements has been studied by subjecting triaxial specimens to cyclic pore pressure changes. These changes were applied through a back pressure burette with full drainage being permitted throughout the duration of the tests. The tests were performed at constant total loads, and a total of 11 tests were completed. Results from the laboratory tests showed permanent changes in volume and shape during the cyclic pore pressure changes. The deformation rates reached approximately constant values in the range of 30 cycles and were dependent on the magnitude of the pore pressure changes. The strain rates also increased linearly with an increase inthe ratio Au/Auf. Correlations between the laboratory test results and the field soil behaviour show that the displacements pattern can be predicted from the cyclic pore pressure changes. The new analysis, however, seriously underpredicts the downslope movements, as the magnitude of the field displacements is much larger than those predicted.
Bibliography of Canadian Geomorphology