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Theory of Coulomb

Theory of Coulomb
This theory has limits to its application being based on certain assumptions and approximations, namely:
a) the upper surface of the embankment consists of a horizontal plane (eta = 0);
b ) face of the embankment consists of a vertical plane (beta = 90 °);
c) shall be deemed to c = 0, ie it is assumed that the soil is devoid of cohesion. This hypothesis implies that the thrust value S obtained is slightly higher than the real

the sliding surface of the prism of the earth is considered flat.
has a negligible influence on the value of thrust and is in favor of stability, because it reduces the creep resistance of the wedge of land;