Abstract
It is now recognized that many geomaterials have nonlinear failure envelopes. This non-linearity is most marked at lower stress levels, the failure envelope being of quasi-parabolic shape. It is not easy to calibrate these nonlinear failure envelopes from triaxial test data. Currently only the power-type failure envelope has been studied with an established formal procedure for its determination from triaxial test data. In this paper, a simplified procedure is evolved for the development of four different types of nonlinear envelopes. These are of invaluable assistance in the evaluation of true factors of safety in problems of slope stability and correct computation of lateral earth pressure and bearing capacity. The use of the Mohr-Coulomb failure envelopes leads to an overestimation of the factors of safety and other geotechnical quantities.
Highlights
Comprehensive literature reviews on nonlinear envelopes can be found in [1] [2] and a repetition here will be superfluous
4) Produce a simpler procedure for calibrating the power-type failure envelope equivalent to the Hoek-Brown failure envelope using triaxial test data; 5) Compute the lateral earth pressure for a material with modified Maksimovic failure criterion; 6) Determine the factor of safety of a slope made of material with modified Maksimovic criterion; 7) Determine the factor of safety of a slope made of material with HoekBrown criterion
The calibration of a nonlinear failure envelope from triaxial test data is a problem of considerable difficulty [2] [7] [8]
Summary
Comprehensive literature reviews on nonlinear envelopes can be found in [1] [2] and a repetition here will be superfluous. A and b are parameters in the equation of quadratic failure envelope The aims of this manuscript are to 1) Calibrate the modified Maksimovic nonlinear failure envelope from triaxial test data; 2) Develop a simplified procedure for calibrating the polynomial type failure envelope from triaxial test data; 3) Develop a simple methodology for calibrating the power-type failure envelope from triaxial test data;. 4) Produce a simpler procedure for calibrating the power-type failure envelope equivalent to the Hoek-Brown failure envelope using triaxial test data; 5) Compute the lateral earth pressure for a material with modified Maksimovic failure criterion; 6) Determine the factor of safety of a slope made of material with modified Maksimovic criterion; 7) Determine the factor of safety of a slope made of material with HoekBrown criterion. The influences of nonlinearity on lateral earth pressure and factor of safety of slope with material made of modified Maksimovic law have never been attempted before and are quite difficult to implement
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