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APPENDIX 2



Hoek and Bray's stability coecients



Fig. A2.1 Groundwater ¯ow conditions



395



SHORT COURSE IN SOIL AND ROCK SLOPE ENGINEERING 0 2·0



0·01 0·02 0·03 0·04



0·05



0·06



1·8



0·07 0·08 0·09



1·6



1·4



0·10 0·11 0·12 0·13 0·14 0·15 0·16 0·17 0·18 0·19 0·20



Tan φ F



1·2



c γH. Tan φ



0·25 90˚



1·0



0·30 0·35 0·40



0·8 Slope angle 80˚



0·6 70˚ 50˚



0·4



60˚



40˚ 30˚



0·45 0·50 0·60 0·70 0·80 0·90 1·0



20˚



0·2



10˚



1·5 2·0 4·0



0



0



0·02 0·04 0·06 0·08 0·10 0·12 0·14 0·16 0·18 0·20 0·22 0·24 0·26 0·28 0·30 0·32 0·34 c γHF



Fig. A2.2 Circular failure chart number 1



396



∞



APPENDIX 2 HOEK AND BRAY'S STABILITY COEFFICIENTS 0 2·0



0·01 0·02 0·03 0·04



0·05



0·06



1·8



0·07 0·08 0·09



1·6



1·4



0·10 0·11 0·12 0·13 0·14 0·15 0·16 0·17 0·18 0·19 0·20



Tan φ F



1·2



c γH. Tan φ



0·25



90˚



1·0



0·30 0·35 0·40



0·8 Slope angle 80˚ 0·6 70˚ 50˚ 40˚ 30˚



0·4



60˚



0·45 0·50 0·60 0·70 0·80 0·90 1·0



20˚ 0·2



10˚



1·5 2·0 4·0



0



0



0·02 0·04 0·06 0·08 0·10 0·12 0·14 0·16 0·18 0·20 0·22 0·24 0·26 0·28 0·30 0·32 0·34 c γHF



∞



Fig. A2.3 Circular failure chart number 2



397



SHORT COURSE IN SOIL AND ROCK SLOPE ENGINEERING 0 2·0



0·01 0·02 0·03 0·04



0·05



0·06



1·8



0·07 0·08 0·09



1·6



1·4



0·10 0·11 0·12 0·13 0·14 0·15 0·16 0·17 0·18 0·19 0·20



Tan φ F



1·2



c γH. Tan φ



0·25 90˚



1·0



0·30 0·35



Slope angle



0·8 80˚ 0·6



70˚ 50˚ 40˚



0·4



60˚



30˚ 20˚



0·40 0·45 0·50 0·60 0·70 0·80 0·90 1·0



0·2



1·5 2·0 4·0



0



0



0·02 0·04 0·06 0·08 0·10 0·12 0·14 0·16 0·18 0·20 0·22 0·24 0·26 0·28 0·30 0·32 0·34 c γHF



Fig. A2.4 Circular failure chart number 3



398



∞



APPENDIX 2 HOEK AND BRAY'S STABILITY COEFFICIENTS 0 2·0



0·01 0·02 0·03 0·04



0·05



0·06



1·8



0·07 0·08 0·09



1·6



1·4



0·10 0·11 0·12 0·13 0·14 0·15 0·16 0·17 0·18 0·19 0·20



1·2



Tan φ F



90˚



c γH. Tan φ



0·25 0·30



1·0



0·35 Slope angle



0·8 80˚ 0·6



70˚ 60˚ 40˚



0·4



50˚



0·40 0·45 0·50 0·60 0·70 0·80 0·90 1·0 1·5 2·0



0·2



4·0 0



0



0·02 0·04 0·06 0·08 0·10 0·12 0·14 0·16 0·18 0·20 0·22 0·24 0·26 0·28 0·30 0·32 0·34 c γHF



∞



Fig. A2.5 Circular failure chart number 4



399



SHORT COURSE IN SOIL AND ROCK SLOPE ENGINEERING 0 2·0



0·01 0·02 0·03 0·04



0·05



0·06



1·8



0·07 0·08 0·09



1·6



1·4



0·10 0·11 0·12 0·13 0·14 0·15 0·16 0·17 0·18 0·19 0·20



Tan φ F



1·2



c γH. Tan φ



0·25 0·30



1·0



0·35 Slope angle 80˚



0·8



70˚



0·6 60˚ 50˚ 40˚



0·4 30˚



0·40 0·45 0·50 0·60 0·70 0·80 0·90 1·0



20˚ 0·2



10˚



1·5 2·0 4·0



0



0



0·02 0·04 0·06 0·08 0·10 0·12 0·14 0·16 0·18 0·20 0·22 0·24 0·26 0·28 0·30 0·32 0·34 c γHF



Fig. A2.6 Circular failure chart number 5



400



∞