ABSTRACT
This chapter describes the method of analysis for plane failure and demonstrates its application to the design of reinforced slopes. It analysis the methods for slopes subject to seismic ground motion. Plane failure is particularly useful for demonstrating the sensitivity of the slope to changes in shear strength and ground water conditions—changes that are less obvious when dealing with the more complex mechanics of a three-dimensional slope failure. The factor of safety for plane failure is calculated by resolving all forces acting on the slope into components parallel and normal to the sliding plane. The chapter describes the calculation of the shear strength properties of the bedding planes, assuming that the factor of safety was 1.0 when the tension crack filled with water and the slope failed. The shear resistance of the doweled joint comprises the shear strength due to friction on the joint, and the elastic response of the steel dowel, grout and rock.
