EXPERIMENTAL RESEARCH ON STABILITY OF JINPING HIGH SLOPE WITH THREE-DIMENSIONAL GEOMECHANICAL MODEL

A question which frequently arises in discussions on slope stability is how high and how steep can a rock slope be excavated for hydraulic engineering.A new slope failure test method is proposed;in which the slope model is rotated by hydraulic lift from stable state to failure.In this test,with increasing the rotation angle of model,the dead-weight and the total force tending to induce sliding would be changed;and the crack initiation,propagation,the rock mass slippage and final failure process can be observed by DV monitor.Finally,the factors of safety of slope stability also can be evaluated with displacement data sensors.The experimental results show that:(1) The bending and toppling cracks in the zone of the slope without reinforcement as well as strong relaxation and tensional cracks are extended commonly.The controlling factors for rock cracking and slope failure could be observed for the faults f5,f8,f42–9,SL44–1 and lamprophyre X.(2) The factor of safety of slope cracking,K1 equals 1.92;and the factor of safety of integrity stability,K2 equals 3.26.(3) The reinforcement design with bolts and long anchors are very effective for keeping cracks closed in rock and the slope stability.(4) The experimental method proposed is effective to evaluate the factor of safety of slopes similar to Jinping high slope.