玉江断裂对玉溪东风水库大坝的地震影响浅析  

Analyzing Earthquake Influence of Yujiang Fault on Dongfeng Reservoir Dam

作　　者：王洋龙[1] 王晋南[1] 安晓文[1] 毛玉平[1] 

机构地区：[1]云南省地震局,昆明650224

出　　处：《地震研究》2008年第1期51-57,共7页Journal of Seismological Research

基　　金：云南省重点科技攻关项目"复杂构造区水库地震监测预警研究"课题(2006SG01-2)资助

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700m,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。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.

关 键 词：玉江断裂 发震断裂 安全距离 地表应变 东风水库 云南 

分 类 号：P315.728[天文地球—地震学]