Taylor's Chart

lope stability concepts

If there are loading outside the toe that prevent the circle from passing below the toe, the long dashed curved should be used to determine the developed cohesion. Note that the solid and the long dashed curves converge as n approaches zero. The circle represented by the curves on the left of n = 0 does not pass below the toe, so the loading outside the toe has no influence on the developed cohesion.
Taylor's Chart

Stability assessments of earth slopes require limit state calculations,
which differ significantly from those in structural engineering.
This is because the weight of the soil constitutes the main
load on slopes, yet it contributes to forces both resisting and driving
the collapse. These forces depend on the mode of failure and
the particular geometry of the failure mechanism. Consequently,
the safety factor cannot be defined as a ratio of the limit load to
the working load ~both being ill-defined for slopes!, but is usually
defined as a function of the strength of the soil. Typically, the
strength of the soil is described by the Mohr–Coulomb yield condition
as a function of the cohesion, c, and the internal friction
angle, w. A common definition of the factor of safety ~F! is the
ratio of the shear strength of the soil to the shear stress necessary
to maintain limit equilibrium


Taylor's stability chart is the main tool used for engineering analysis of simple homogeneous slope stability problems. It is likely that this situation will continue in the future. One of the main deficiencies of Taylor's original presentation is that it does not provide a convenient, general tool for establishing the critical slip circle associated with a given stability problem. Critical circles define the extent of the potentially unstable zone, and this information is quite useful in many practical situations. The present work completes Taylor's classical investigation of stability of homogeneous slopes, and presents the tools necessary in order to establish not only stability numbers (safety factors), but also critical slip circles associated with those numbers. The information defining critical slip circles is presented in a simple chart form which is convenient for practical applications.



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