ABSTRACT
Abstract: Mechanical properties of rock under coupled static and dynamic stresses are apparently different from that under either static or dynamic load. Experimental techniques for testing rock under coupled static and dynamic loads are introduced in this chapter. A new testing technique relates the physical stress state of rock subjected to simultaneous coupled static and dynamic stresses is presented. The method involves modification of a split Hopkinson bar and INSTRON electro-hydraulic servo controlled testing system. The test specimen is subjected to coupled axial static pre-stress or triaxial pre-stress, and axial dynamic loading. The experimental results generally indicate that the coupled static-dynamic strength is higher than its static strength and its dynamic strength.
1 INTRODUCTION
