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• ASSUMPTIONS <br />I. The material forming The slope is homogeneous. <br />2. Failure is assumed to occur on a circular failure surface which passes through the <br />toe of the slope. <br /> <br />3. The shear strength of The material is characteristic by a cohesion C and a friction <br />angle ~. <br />4. The unit yaeight of material of a compacted fill is 150 Ib/ft3 with u cohesion of <br />7500 Ib/ftz. <br /> <br />S. ThQ unit weight of material making up a road cut slope is 88 Ib/ft3 with a <br />.cohesion of 1000 Ib/ft2. <br />6. The friction angle is equivalent to the angle of repose of the material. <br />7. Tension cracks do not occur in the upper surface ~or in the face of The slope. <br />8. The failure surface is located such That the factor of safety is a minimum for the <br />slope geometry. <br />9. Road fills are well drained and water pressure is negligible. <br />10. In Bishop's method of slices, the slices act independent of the adjacent slice. <br /> <br />Revised 3/82 3.56-6 <br />