TREATMENT OF HIGH AND STEEP SLOPES WITH COMPLICATED GEOLOGICAL CONDITIONS AT LEFT ABUTMENT OF JINPING I HYDROPOWER STATION

To deal with the toppling deformation and fracture rock-mass problem at the embankment slope in Jinping hydropower station,the whole slope surface is reinforced by shotcrete support,rock bolting and frame pier with prestressed cable.The integral stability of left slope is controlled by the potential large sliding body which is composed by fault f42-9,deep crack SL44-1 and lamprophyre dike X.Some three-layer anti-shear tunnels on the sliding body are designed;and a lot of deep perstressed cables across the faults are placed at the slope surface to reinforce the sliding body.A management system,which follows the principle of dynamic design,scientific study tracking,safety monitoring and immediate reacting analysis,and dynamic management informationization,is established.According to the geological conditions and safety monitoring data during excavation,combining with construction situation,slope stability analysis and real-time safety monitoring could be conducted;in addition to the optimization of design and strict controlling of construction procedure,excavation work of the left embankment slope finally goes on smoothly.