[S-TT07_29AM1] Frontier Researches in Exploration Geophysics

[STT07-05] Numerical study for failure behavior of rock masses including complex free-surfaces using a particle method

*Junichi TAKEKAWA¹, Hitoshi MIKADA¹, Tada-nori GOTO¹ (1.Kyoto Univ.)

Keywords:particle method, failure behavior, rock mass

Failure of rock mass including complex free surfaces is of importance in many engineering and scientific fields. This paper applied an advanced discretization approach to simulate quasi-static failure of rock mass within a Hamiltonian particle method (HPM) framework. In HPM, a free surface is introduced in a simple way, just by removing or ignoring outer particles. This potential can be developed to discretize numerical models including complex free surfaces without the increment of time for pre-processing. In the present study, we developed the numerical simulator based on HPM with a staggered particle technique for simulating brittle failure and AE activities in rock mass with incorporating the elasto-plastic damage model. We, first, conducted uni-axial compressive tests for validating the effectiveness of our approach. Next, we adopted rectangular and circular disc specimens with a hole as complex free surface models. Our numerical results had good agreement with those from laboratory experiments. This suggests that HPM would be a method to simulate failure behavior of rock mass without time-consuming pre-processing.