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APPENDIX 2
Hoek and Bray's stability coecients
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
∞