Constant Normal Stiffness Conditions Research Articles

Frictional characteristics of planar concrete-rock interfaces under constant normal stiffness conditions : Proc 4th Australia-New Zealand Conference on Geomechanics, Perth, Western Australia, 14–18 May 1984 V2, P397–401. Publ. Barton: Inst of Engineers, 1984

During the loading of rock socketed piles, the side resistance developed is a function of the stiffness of the surrounding rock mass and the roughness of the socket walls. In order to evaluate the basic frictional characteristics of planar concrete-rock interfaces without initial bonding, a series of direct shear tests were conducted in a specially designed machine using a synthetic rock with a range of normal stiffness and initial normal stress conditions. It is demonstrated that for the prescribed planar interfaces the peak angle of friction is dependent on both the normal stiffness and the initial normal stress while the residual angle of friction is essentially independent of both. (Author/TRRL)