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Title:: Analyzing Earthquake Influence of Yujiang Fault on Dongfeng Reservoir Dam

Author(s):: WANG Yang-Long; WANG Jin-Nan; AN Xiao-Wen; MAO Yu-Ping; (Earthquake Administration of Yunnan Province,Kunming 650224,China)

Keywords:: Yujiang fault; seismogenic fault; safe distance; surface strain; Dongfeng reservoir; Yunnan

摘要:: 对玉江断裂的活动性进行了研究,并结合对滇中地区地震构造和震例的分析,认为该断裂是一条具备发生6.5级左右地震危险的地震构造,其主要危险地段为晚更新世活动段,该地段距离大坝仅为700 m,一旦发生地震,大坝将遭受Ⅷ度左右的破坏。地震虽然不会对大坝产生不可抗拒的断错破坏,但引起的地表应变值很可能大于0.65×10^-4,严重威胁着大坝的安全。所以应该考虑对该坝体采取行之有效的抗应变加固措施。

Abstract:: The activity of the Yujiang fault has been studied in this paper.Combining the seismic fault with the earthquake case analyses in the mid-Yunnan area it is considered that this fault is a seismic structure having M6.5 earthquake risk.The major risk segment is Epipleistocene part,where is only 700m away from the dam.Once an earthquake occurs the dam will suffer VIII or VIII⁺ damage.Although an earthquake will not cause irresistible dislocation damage to the dam the surface strain value is possibly greater than 0.65×10^-4,which will greatly threaten the safety of the dam.Therefore an effective reinforcement measures against the strain should be taken to the dam body.