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.
出处
《地震研究》
CSCD
北大核心
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
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
Yujiang fault, seismogenic fault
safe distance
surface strain
Dongfeng reservoir
Yunnan
