Displacement monitoring on Shuping landslide in the Three Gorges Dam Reservoir area, China from August 2004 to July 2007

Shuping landslide is a reactivated landslide triggered by the first impoundment of the Three Gorges Dam Reservoir, China in June 2003. For the purposes of landslide disaster mitigation in the reservoir area and clarification of the mechanism of landslide movement caused by water level changes of dam reservoir, a monitoring system mainly consisting of drum style extensometers was installed in Block-1 of the Shuping landslide. The monitoring was started in August 2004. In August 2006, more monitoring devices including new drum style extensometers were installed to increase the number of monitoring points, and five flexible extensometers were installed near the water level changing area of the reservoir along the longitudinal section. In this paper, the three-year monitoring results by extensometers from August 2004 to July 2007 are presented, and the deforming mechanism of the Shuping landslide caused by the water level change of the Three Gorges Dam Reservoir is examined.