Title of Paper:基于微震监测的大岗山高拱坝坝踵蓄水初期变形机制研究

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Date of Publication:2022-10-10

Journal:岩石力学与工程学报

Affiliation of Author(s):建设工程学部

Volume:36

Issue:5

Page Number:1111-1121

ISSN No.:1000-6915

Abstract:The safety of the heel of the concrete high arch dam is highly concerned
   during the initial impoundment. The microseismic monitoring system was
   installed for the first time in China at the high arch dam heel. The
   real-time monitoring of the micro-cracks was achieved in the heel zone
   of the Dagangshan arch dam during the initial impoundment. The
   deformation mechanism of the arch dam heel and its relationship with the
   microseismic activities were investigated. The P wave velocity was
   determined using the manual tapping test and was 4 300 m/s with the
   error of system positioning less than 8 m. The event waveforms were
   denoised. The automatic positioning results were manually verified for
   better accuracy. The results proved the feasibility of applying the
   microseismic monitoring technology in the large-scale concrete
   structures. During the initial impoundment period,the microseismic
   activities of the high arch dam heel were closely related to the water
   level of reservoir. The accumulation area of micro-cracks was
   transferred from the dam heel to the dam toe. The deformation of the toe
   area of dam increased and of the heel area decreased. The process of
   microseismic deformation of the dam heel zone revealed the inducement of
   the crack at the base corridor vault at the elevation of 940 m. The
   results can provide reference for the studies on the microseismic
   monitoring of concrete high arch dams as well as the dam working
   performances.

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