Title of Paper:岩质边坡微震活动特征及其施工响应分析

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Date of Publication:2022-06-30

Journal:岩石力学与工程学报

Volume:34

Issue:5

Page Number:968-978

ISSN No.:1000-6915

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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