Deformation mechanism of the dam heel of Dagangshan high arch dam based on microseismic monitoring during initial impoundment
MA Ke1，JIN Feng2，TANG Chun?an1，LU Pengfei3，ZHUANG Duanyang1
(1. Institute of Rock Instability and Seismicity Research，Dalian University of Technology，Dalian，Liaoning 116024，China；
2. State Key Laboratory of Hydroscience and Hydraulic Engineering，Tsinghua University，Beijing 100084，China；
3. Guodian Dagangshan Hydropower Development Co.，Ltd.，Ya?an，Sichuan 625409，China)
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.
马 克1，金 峰2，唐春安1，吕鹏飞3，庄端阳1. 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[J]. 岩石力学与工程学报, 2017, 36(5): 1111-1121.
MA Ke1，JIN Feng2，TANG Chun?an1，LU Pengfei3，ZHUANG Duanyang1. Deformation mechanism of the dam heel of Dagangshan high arch dam based on microseismic monitoring during initial impoundment. , 2017, 36(5): 1111-1121.
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