ABSTRACT:

Hopkinson bundle bars device is developed on the Split Hopkinson Pressure Bar (SHPB) system to investigate the dynamic slip characteristics of cement joint under compression-shear combined loading. The experimental configuration of one-bar/three-bar incidence and three-bar transmission is employed to measure signals of different locations in specimen, which used to determine the slipping state of joint surfaces. And the overall slipping states of joint surfaces are then obtained. The study is helpful to reveal local slipping and whole slipping state of joint surface.

1 INTRODUCTION

Rock is one of the most widely used materials in geotechnical engineering, civil engineering, hydraulic engineering, etc. Natural rocks are complex medium with such defects as cracks and pores at the meso and micro scale, and joints at the macro scale. Quasi-static and dynamic strength properties of rock mass in geotechnical engineering are mainly determined by these complicated meso and macro geometry structures. Rock materials are both load-path dependent and strain-rate dependent. Specific efforts had been made on the improvement of experimental techniques to investigate the compression properties of rock joints.

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