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Abstract The stability of high rock slope is one of the important issues during the construction of hydropower station. The stability of the left bank slope at Jinping I hydropower station was the key issue due to its high geo-stress，developed faults and fissures，large-scale excavation，deep unloading and complicated geological conditions. The characteristics of the microseismic activity of the left bank slope were introduced firstly. Analyses of the temporal and spatial distributions of the microseismic activity in the processes of excavation-induced unloading and under the excavation conditions during the different periods and in the different regions were conducted. The correlation among the initiation，propagation，extension and coalescence of micro-fractures of rock and the rock mass damage were discussed. The correlation between the microseismic activity and the construction response at the left bank slope was also obtained. The results showed that the microseismic activity induced by the unloading relaxation of the deep rock mass as results of the excavation of the foundation pit of dam，the X shafts for lamprophyre vein replacement and the drainage tunnels at the elevation of 1670 m and the consolidation grouting of weak layers inside the rock slope reflected in real time the construction conditions on site very well.
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2015, Vol. 34 
