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Sheeting Design 

GEO5

Geotechnical software

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Slope stability analysis

Load reduction (DA1, DA2, DA3):

Permanent as well as variable loads are reduced in the analysis by partial factors γG and γQ, respectively. Depending on the inclination of slip surface the program evaluates whether the gravity force acting on a given block, is favorable or not. If the favorable effect of force is greater than the unfavorable one the program adopts the favorable coefficient. Based on that the weight of block W is pre-multiplied by the partial factor for permanent load.

Influence of water (pore pressure and water above terrain) also reduced by partial factor γw.

Determining whether the force action is favorable or notDetermining whether the force action is favorable or not

For inputted surcharges the program first evaluates whether these act favorably or not then pre-multiplies the overall loading by the corresponding partial factor.

Reduction of material (DA1, DA3):

Parameters of soils are automatically reduced by corresponding partial factors.

Reduction of resistance (DA2):

Resistance on a slip surface is reduced.

WARNING !!! Calculation of slope stability according to DA2 or DA1 (comb. 1) using total parameters gives very unrealistic results. These are caused by different reduction of self-weight massive (favourable and unfavourable). In case of using above mentioned approaches we recommend hand change of reduction partial factors (i.e. increase partial factor on overall stability and decrease partial factors on actions).

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