NUMERICAL INVESTIGATION OF THE MECHANICAL BEHAVIOR OF ROCK UNDER CONFINING PRESSURE AND PORE PRESSURE

摘要

Many of the important problems of rock engineering are concerned with mechanical behaviours of rock where the internal rock structure sustains pore pressure and confining pressure from the surrounding rocks. A basic understanding of rock mechanical properties under confining pressure and pore pressure conditions is of great importance in rock mechanics and rock engineering. In this paper, the newly-developed pore-pressure incorporated Rock Failure Process Analysis model (RFPA) is briefly outlined at first. Then a series of numerical tests on rock under different constant confining pressure and pore pressure are conducted to illustrate how the overall macroscopic responses and mechanical properties of brittle heterogeneous rocks under different confining pressure and pore pressure were revealed by RFPA code. In addition, through the modelling of acoustic emission sequences in rock progressive failure, the AE characteristics and the correlation between AE events and stress-strain curves under different confining pressure and pore pressure were also investigated. From the numerically simulated results, it can be possible to analyze large-scale practical rock engineering problems such as mining induced seismicities and rock bursts.