Published: Jan 1971
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The estimation of elastic settlement of a foundation requires a realistic knowledge of the modulus of deformation of the soil. It commonly is known that the modulus value of a soil may vary over wide limits, depending on the method of test and many other factors. A comprehensive evaluation of the modulus of deformation of a stiff fissured clay is presented. The effects of sample disturbance, strain rate of compression, anisotropy, sample size, and confining pressure on the modulus value were investigated in the laboratory. These results were compared with modulus values obtained from plate loading tests in deep test pits. The effect of sample size did not show a marked variation in the value of modulus determined. A comparison between the results of borehole and block samples showed the effect of sample disturbance to be by far the most overriding factor. The results from plate loading tests appeared to provide the most consistent and reliable values.
modulus of deformation, soils, clays, foundations, boreholes, sample disturbance, anisotropy, strain rate, plate loading tests, evaluation, tests
Professeur agrege, Universite Laval, Quebec, Que.
Principal, Golder Associates, Toronto, Ont.
Supervising engineer, Ontario Hydro, Toronto, Ont.