Failure Mechanism and Mitigation Measures of the G1002 Electricity Pylon Landslide at the Jinping I Hydropower Station

Figure 3

Geological engineering plan and the features of the G1002 EPL. The flow direction (blue dashed line) changed from 291° to 275° with a deflection angle of 16° at the concave gully bend, where the toe of the slope could suffer the erosion and scour of the floods. (a) The G1002 EPL blocked the gully. There were wide slate outcrops on the left side slope (covered by the flexible protection net). (b) The tractive deformation zone at the rear of the main scarp of the G1002 EPL. A deep tensile crack threatened the foundation of the G1002 electricity pylon. (c) The exposed D-pile of the G1002 electricity pylon.