| 奉节钻孔应变前兆异常机理分析——区域应力场应力传递的结果 |
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| 引用本文： | 龚丽文,陈丽娟,郭卫英,陈涛,唐小勇.奉节钻孔应变前兆异常机理分析——区域应力场应力传递的结果[J].西北地震学报,2021,43(5):1087-1094,1102. |
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| 作者姓名： | 龚丽文 陈丽娟 郭卫英 陈涛 唐小勇 |
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| 作者单位： | 重庆市地震局, 重庆 401147;中国科学院大学 计算地球动力学重点实验室, 北京 100049 |
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| 基金项目： | 中国地震局专项"全国地球物理台网数据跟踪综合分析与产出";地震科技星火计划项目（XH19035Y）;重庆地震局科技创新团队项目 |
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| 摘 要： | 奉节钻孔应变前兆异常对应震例较远,前兆异常机理不明确。结合其他观测数据和历史背景资料,对比分析该异常的可信度及观测物理意义,并进一步利用有限元模拟方法分析其前兆异常机理。结果显示：奉节钻孔应变的趋势变化与附近的其他观测资料较吻合,能记录到区域应力场的变化信息。数值模拟分析认为该台位于扬子地台四川台坳东缘,扬子地台基底较硬,具有很好的应力传递性;地台边缘岩性破碎较软,受力易变形,对块体另一端的应力较敏感。因此,奉节钻孔应变趋势异常变化是区域应力场应力传递的结果。
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| 关 键 词： | 有限元分析 地质模型 机理分析 应力传递 |
| 收稿时间： | 2019/9/13 0:00:00 |
Mechanism of borehole strain precursor anomaly at Fengjie station: results from stress transfer in regional stress field |
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| GONG Liwen,CHEN Lijuan,GUO Weiying,CHEN Tao,TANG Xiaoyong.Mechanism of borehole strain precursor anomaly at Fengjie station: results from stress transfer in regional stress field[J].Northwestern Seismological Journal,2021,43(5):1087-1094,1102. |
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| Authors: | GONG Liwen CHEN Lijuan GUO Weiying CHEN Tao TANG Xiaoyong |
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| Institution: | Chongqing Earthquake Agency, Chongqing 401147, China;Key Laboratory of Computational Geodynamics of Chinese Academy of Science, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Nowadays, the mechanism of borehole strain precursor anomaly at Fengjie station is not clear. In this paper, combined with other observation data and historical background information, the reliability and physical significance of the anomaly were compared and analyzed, and the precursory anomaly mechanism was further analyzed by finite element simulation method. The results showed that the trend change of borehole strain at Fengjie station, which is consistent with other nearby observation data, is a record of changes in regional stress field. Fengjie station is located in the eastern margin of Sichuan depression of Yangtze platform. Numerical simulation results showed that the substrate of Yangtze platform is hard and has good stress transmission. The lithology at the edge of Yangtze platform is relatively soft, easy to deform under stress, and sensitive to the stress at the other end of the platform. Therefore, the abnormal trend change of borehole strain at Fengjie station is the result of stress transfer in regional stress field. |
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| Keywords: | finite element analysis geological model mechanism analysis stress transfer |
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