An analysis of stress-strain behaviour and wetting effects on quarried rock shells
The analysis of stressstrain behaviour and the effects of submergence on quarried rock shells, used mainly in dams but also in road construction, is of major importance from both economic and safe...
EVALUATION OF STRESS CELL PERFORMANCE
Described in this paper are the design and construction of a series of low compliance total stress cells and their performance in the laboratory and in the field. Experimental data from laboratory calibration tests are evaluated by means of several different finite element models, and the results indicate that, within the limits investigated, neither the thickness-to-diameter ratio of these cells nor the relative stiffness of the soil and the cell had much influence on the measured response, but regions of loose or dense soil in the immediate vicinity of the cells do affect their output. Limited evidence suggests that these cells can also measure horizontal stresses quite reliably. The qualitative field performance of 35 cells within two soil-pipe installations and the quantitative field performance of three free field cells suggest rather convincingly that these cells are relatively insensitive to temperature variations and are capable of measuring accurately the static stresses acting normal to their faces.
Prediction of the behaviour of rockfill materials
The paper presents an approach for predicting the behaviour of prototype rockfill materials by testing materials which have been reduced in size geometrically. Isotropic consolidation and consolidated drained triaxial tests were conducted on various fractions of Calcite and Quartz minerals under confining pressures varying up to 126 kg/cm2. The ratio of d50 of coarsest to the finest material tested for these minerals was about 35. The experimental data of other investigators has been utilized in support of this approach. The approach presented seems to be promising in predicting the behaviour of prototype materials by testing at least two geometrically reduced smaller sized fractions at two different confining pressures.