AN INVESTIGATION OF THE MECHANICS OF ROCK JOINTS .2. ANALYTICAL INVESTIGATION

In this paper, which is the second of a two-part series, an analytical investigation of the mechanical behavior of initially closely mated j oints in rock undergoing small sliding displacements is undertaken. Gu ided by the experimental observations reported in Part I, the goal is to develop a quantitative theory for joint behavior, including phenome na such as dilatancy, damage of surface roughness, and cyclic sliding behavior. The approach is by microstructural modeling in which a reaso nable surface idealization is employed along with physically acceptabl e models for various aspects of joint behavior such as elastic joint d eformability, sliding criteria and damage evolution. The result is a m acroscopic constitutive law for joint behavior which is essentially no nempirical, is easy to evaluate, valid for general small displacement sliding histories, and is easy to implement in analysis software.