ABSTRACT:

The P-wave propagation through fractured rock mass is simulated using UDEC with a cohesive fracture model. A series of laboratory tests from literature on P-wave propagation through rock mass containing single fracture and two parallel fractures are introduced and the numerical model used to simulate these laboratory tests are described. The simulation results show that the proposed model, particularly the cohesive fracture model can capture very well the wave propagation characteristics in rock mass with un-welded and welded fractures with and without filling materials. In the meantime, in order to identify the significance of fracture on wave propagation, filling material with different particle sizes and the fracture thickness are discussed, and both factors are found to be crucial for wave attenuation.

1 INTRODUCTION

Natural rock mass contains continuous intact rocks and discontinuities, such as faults, joints, fissures and beddings. These discontinuous geological structures are most likely filled with weathered residuals, for example sands, clays and organic materials from plants. A better understanding of the wave propagation mechanism of the filled discontinuities in rock mass is theoretically and practically meaningful.

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