EXPERIMENTAL TESTS FOR IMPACT OF STRUCTURAL SURFACES TO TOPPLING DEFORMATION IN ANTI-DIPPED ROCK SLOPES

Nine groups of floor-friction simulations are designed to investigate the effect of different angle cracks to the anti-dipped rock slopes. They are divided into no fissure group, a steep fissure group and a group of a steep fissure and a gentle fissure. The effect of different crack angles on the fracture surface is examined. The following conclusions are obtaine. The change of the dip angle of the steep fissure has an obvious regular influence on the deformation of rock slope and the morphology of the main fracture surface. For the steeper dip angle of the steep fissures, the initial site of destruction gradually is shallower, and the damage area is relatively reduced, and the fracture surface can gradually change from the near line to the near arc. Because of the existence of the gentle dip crack, the process that steep dip fissure along the tip of the steep fissures and communicating with each other to form a penetrating fracture surface is quicker. In the event of toppling deformation, stratified rock on the main rupture surface produces reverse bending breaking in the middle area. Through quantitative analysis, it is found that with the increase of fissure dip angle, the failure amplitude of toppling deformation on rock slopes is reduced. Besides, for the main fracture surface, both the length and the fractal dimension of trace complexity decreases accordingly.