Abstract
Taylor's slope stability chart for combined effects of horizontal and vertical seismic coefficients
Highlights
The stability factor can be expressed by replacing the original unit weight γ with an equivalent unit weight γE as given below c F γEH
It should be noted that the factor of safety F in the expression of stability number as presented in Fig. 1 and the calculated value in the illustrative example in the authors’ paper refer to the factor of safety with respect cohesion F 1⁄4 Fc (=c/cd, cd being the developed/mobilised cohesion) based on full mobilisation of the modified friction angle φm
It may be noted that the factor of safety with respect to cohesion with full mobilisation of the modified angle of internal friction, Fc 1⁄4 0·844 (see section (b) of the illustrative example, p. 351, and the last row of Table 1) is obtained here by following the traditional graphical approach, mainly because of the low value of modified angle of internal friction, φm 1⁄4 7·5°
Summary
Taylor’s slope stability chart for combined effects of horizontal and vertical seismic coefficients. The discusser would like to contribute with respect to the correct interpretation of the authors’ results for the determination of the safety factor of slopes. This has been demonstrated by taking one of the working examples reported by the authors in their paper. The reduction friction factor m was obtained by considering an equivalent unit weight γE, aiming to use stability numbers in Taylor’s slope stability chart. The original unit weight γ used in the definition of the stability number in the Taylor’s slope stability chart must be replaced by an equivalent unit weight γE in the determination of safety factors. The stability factor can be expressed by replacing the original unit weight γ with an equivalent unit weight γE as given below c F γEH
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