Title of Paper:基于微震监测的大岗山水电站高拱坝廊道裂缝形成原因研究

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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:37

Issue:07

Page Number:1608-1617

ISSN No.:1000-6915

Abstract:Multiple deep cracks appeared at the top arch of galleries in Dagangshan high arch dam before the impoundment. Cracking characteristic around the access gallery at E.L. 979 m,foundation gallery at E.L. 940 m and drainage gallery at E.L. 937 m before and after the impoundment was analyzed using the installed microseismic monitoring system in the high arch dam. The process of crack inducement was reproduced and the real cause of cracking in galleries was studied. The results show that the microseismic activities in galleries are significantly coherent to the water level. Before the impoundment,the microseismicity of the gallery top arch of dam heel area was strong which exceeds its cracking limit,thus inducing gallery cracks in the cross sections of river. After the impoundment,with the rising of water level,the gallery cracks in the area of arch dam heel tends to be stable while galleries in arch dam toe area tend to crack. The trend of the cracking which transferrs from the dam heel area to the dam toe aera during the impoundment process was revealed. It is recommended to keep a close eye on the damage conditions of concrete in arch dam toe area during the impoundment period. © 2018, Science Press. All right reserved.

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