Slope stability design charts

This appendix provides charts for designing infinitely long slopes and slopes subject to circular slips according to Design Approach 1.

The charts for infinitely long slopes (Figure A1.1 to Figure A1.3) are based on the equation for the 'characteristic' stability number Nk that is developed in Chapter 9,with partial factors yg, Yc Y9, and YRe from Design Approach 1. Each chart represents a different ru value (0, 0.3, or 0.5) and the numbers on the curves (1:1, 1:1.5, etc.) represent the gradient of the slope (i.e. tan P).

The charts for circular slips (Figure A1.4 to Figure A1.6) are based on the method of slices. Each chart represents a different ru value and the numbers on the curves represent the gradient of the slope (i.e. tan P). Solid lines are for D/H = 4 and dashed for D/H = 1, where D is the depth to a rigid layer and H the slope height. Figure A1.6 is for undrained conditions.

0 S 10 IS 20 25 30 35 40 45 Angle of shearing resistance, ^ (deg)

Figure A1.2. Design chart for infinitely long slope with ru = 0.3

0 0

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