No description available.

A series of one-dimensional strain rate controlled consolidation tests were performed on remolded peat to establish the void ratio - effective stress - strain rate relationship for this soil. The relationship was found to be independent of the size of sample. In addition, the void ratio - permeability relationship was also determined and was found to be independent of both the strain rate and the size of the sample. From these relationships the behaviour of any size sample subjected to incremental loading was predicted in terms of the time - settlement and the time - pore pressure curves. These predictions included both 'primary' and 'secondary' settlement. The comparison of observed and predicted time - settlement and time - pore pressure curves was found to be in close agreement. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

Stress path and prestrain effects on the monotonic and cyclic undrained behaviour of a saturated sand are investigated in the triaxial test. It is shown that under Identical consolidation stresses, the sand is contractive over a much larger range of relative densities in triaxial extension than in triaxial compression. The effective stress ratio at the initiation of contractive deformation (CSR) in extension is less than that in compression. During cyclic loading this feature makes the extension phase of the loading more damaging than the compression phase. The unique relationship between void ratio and undrained strength at PT state (which is similar to steady state line) noted in compression does not hold in extension. A separate relationship seems to emerge in extension for each initial void ratio and all such relationships lie to the left of the compression relationship, implying smaller PT state strengths in extension than in compression at equal void ratios. A small prestrain history (stress state staying within CSR lines during prestraining) is shown not to alter the initially liquefiable character of sand. With no strain reversal on reloading, increasing prestrain strain level between CSR and PT lines makes the sand. Strain reversal on reloading, on the other hand, causes the sand to become more contractive with increasing prestrain history and may transform an initially dilative to contractive sand. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

A study has been made to evaluate the effects of horizontal drain drainage on the water table drawdown in open pit slopes. Two major parameters of a horizontal drain drainage system, length and spacing, were studied. A two dimensional finite element computer model was constructed to simulate the water flow into drains in rock slopes. Water flow in the saturated zone was assumed. The computer model was tested by the field data obtained from the LORNEX Mine in British Columbia and the data taken from INTRODUCTION TO GROUNDWATER MODELING (Wang & Anderson, 1982). Satisfactory agreements were obtained. As the result of computer simulations, a series of graphs were plotted. These graphs show the relationship between hydraulic head distribution vs. drain spacing and length. They could be used in horizontal drain design as an aid to determine the spacing and length of a drain system. The computer simulations were also made to study the drainage characteristics of anisotropic rock slopes. The results indicated the influence of such rock conditions on the drainage effect. Another feature of mining slopes is that their height varies as the mining operation progresses. Therefore, the suitable vertical spacing between drain rows was investigated by computer simulation. A comparison of the drainage effects of different drain patterns, parallel drain and fanned drain layouts, was also made. / Applied Science, Faculty of / Mining Engineering, Keevil Institute of / Graduate

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.