Abstract: The stability problem of the left bank slope at Jinping-I hydropower station is very prominent. On the basis of microseismic (MS) monitoring technique, the forecasting frames, MS forecasting function and multiple information integration criteria are researched, and a safety early warning system for rock slope stability is set up. The forecasting idea for the left bank slope of Jinping-I hydropower station is built. Thus a comprehensive forecasting system of high slope stability is put forward. This system involves local forecasting based on MS monitoring, global forecasting in consideration of MS damage effect, and multiple information integration criteria. Furthermore, it is applied to the engineering problem at the left bank slope. Results suggest this comprehensive forecasting method could predict the deformation instability risk of rock slope. This research provides basis for the safety warning of the left bank slope of Jinping-I hydropower station during its construction and operation.

Key words: rock slope, microseismic monitoring, Jinping-I hydropower station, stability, safety forecasting