A coupled experimental and numerical simulation of rock slope joints behavior

Abstract

In this research, a coupled numerical-experimental analysis of crack propagation, crack coalescence, and breaking process of jointed rock slopes is performed by studying the mechanical behavior of pre-cracked brittle substances considering the specially prepared rock-like specimens (rock-like specimens are specially prepared by a proper mixing of Portland Pozzolana Cement (PPC), fine sand, and water in a rock mechanics laboratory) and natural rock slopes, simultaneously. The numerical analyses are accomplished using a numerical code based on the higher-order displacement discontinuity method (HODDM). A cubic displacement discontinuity variation along each boundary element is assumed to evaluate the mode I and mode II stress intensity factors (SIFs). Based on the LEFM theory, the maximum tangential stress criterion is implemented in the proposed code for predicting the crack initiation and its direction of propagation (crack coalescence path). Experimental tests are accomplished to evaluate the crack propagation process, crack coalescence, and final breakage path of rock-like specimens containing three parallel cracks (simulating the natural joint set in a rock slope). There is a good agreement between the numerical and experimental results obtained from the tested specimens demonstrating the accuracy and effectiveness of the proposed approach.