Abstract: Many breakings in anchor bolts and cables in tunnel of deep soft rock were one of problems faced by roadway supporting. Based on the conditions without changing the specifications and material of supporting, the yield supporting device of anchor bolts and cables was invented. The functional principle of the yield supporting device was analyzed, that the reserved compression in yield supporting device can protect anchor bolts and cables from broken. At the same time, it could keep high resistance and yield supporting to constraint the surrounding rock deformation. The experimental research on the mechanical property of the yield supporting device was based on the MTS815.02 Rock Mechanics Test System, By using the method of given deformation, the experiment adopted the displacement-controlled modes with the speed of 0.05 mm/s to test the mechanical properties of three groups of the yield supporting device. The tests results indicated that these three groups of devices could respectively match with common anchor bolts, cables of φ17.8 mm and cables of φ18.9 mm for use.

Key words: Surrounding rock deformation, The yield supporting device, High resistance and yield supporting, Mechanical property