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本文根据断裂动力学、古地震及现代应力积累问题等方面的分析结果,对龙羊峡电站坝区F7断层新活动性特征进行了深入的研究。查明该断层是一条第四纪以来多次活动的古粘滑型发震断层,其最新活动休止时间为晚更新世中晚期,现今应力积累程度只达37.9％,在工程年代内该断层处于相对稳定状态。研究中,现代测试技术的应用有效地解决了分析中的一些重要问题。综合运用热发光绝对年龄测定和石英颗粒表面结构扫描电镜研究,为鉴定断层的最新活动年代提供了新的有效方法;热释光温度测定方法则开拓了研究断层粘滑活动性的新途径。
Based on the analysis results of fracture dynamics, paleoearthquakes and the problems of modern stress accumulation, this paper studies the new activity characteristics of the F7 fault in the Longyangxia Power Station dam area. The fault was identified as a paleo-slippery seismogenic fault that has been active for many times since the Quaternary. Its latest active pause time is late-late Pleistocene. At present, the stress accumulation is as high as 37.9%. During the engineering years, the fault was at Relatively stable state. In the research, the application of modern testing technology has effectively solved some important problems in the analysis. The combined use of absolute luminescence dating and scanning electron microscopy (SEM) of quartz grain surface provides a new effective method for identifying the latest age of faults, and the thermoluminescence temperature measurement method opens up a new way to study the stick-slip activity of faults.