DHARM784 GEOTECHNICAL ENGINEERING
Outer
faceAnchorOuter
faceAnchor(a) Sharp edge (b) Stub-nose
Fig. 19.12 Different forms of cutting edge(2) Curb
Curbs are generally made of reinforced concrete. When curb cuts the soil during sinking, a
system of forces acts on it, which is shown in Fig. 19.13.
Force tangential to the bevel surface, Q, is given by
Q = μ.P ...(Eq. 19.16)where P = force acting normal to the bevel surface,
and μ = coefficient of friction between the soil and concrete of the curb.
q qPQ QPH HD 1NNCurbFig. 19.13 Forces on the curb of a well
Resolving vertically,
μ P sin θ + P cos θ = N