## Negative FOS for slope stability in planar failure slopes

## Negative FOS for slope stability in planar failure slopes

(OP)

When I calculate the factor of the safety for a slope with a discontinuity which meets all the criteria for planar slope failure it comes out as -0.69 what does this mean ?

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

Mike Lambert

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

The FOS should be the ratio of resisting forces to driving forces -- neither quantity should be negative, so the FOS should not be negative.

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

Check all of you normal forces. Are they all positive?

Mike Lambert

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

## RE: Negative FOS for slope stability in planar failure slopes

f-d

ípapß gordo ainÆt no madre flaca!