摘要
自三峡水库蓄水以来,三峡库区巴东县库岸段发生上万次与水库蓄水相关的水库地震,最大震级5.1级。近几年发表相关论文50篇左右,侧重于水库地震的震源机制解、水库地震与坝前水位的关系、单个较大型水库地震以及微地震群的成因机理问题,对水库地震时间上的周期性以及空间上扩展规律研究尚少。本论文在野外地质调查(包括泉水流量的调查)基础上,结合近几年发表的文献资料,对巴东县库岸段水库地震变迁过程进行了深入的研究,得出了以下3点结论:(1)从时间上看,巴东水库地震的爆发具有周期性,表现为长周期和短周期。(2)溶洞坍塌型水库地震的分布呈线状,其形成机理与高孔隙水压以及动水圧过程密切相关。(3)同时野外泉水调查研究也表明三峡库区巴东段水库地震与溶洞坍塌具有密切关系,并且从机理上说明了水库地震空间扩展机制。
Since the impoundment of the Three Gorges Reservoir,thousands of reservoir earthquakes associated with reservoir storage occurred in Badong County. The largest recorded magnitude is 5. 1. In recent years,about 50 related papers have been published,which focused on the aspects including the focal mechanism solutions of reservoir earthquake and the relationship with water level in the front dam,and the genetic mechanism of single reservoir earthquake and the micro earthquake swarms. There is a lack of research on reservoir earthquake time periodicity and spatial expansion regularity. On the basis of the field geological survey（ including the spring flow survey） and the literature published in recent years,this paper presents a deep study on the earthquake evolution process of reservoir part in Badong County. Results are as follows：（ 1） The outbreak of Badong reservoir earthquake has specific temporal periodicity,which is shown as long and short cycles.（ 2） Reservoir earthquakes of karst collapses manifested as linear distribution,and their formation mechanism is closely related to higher pores water pressure and dynamic water pressure process.（ 3） Field investigation results of spring water also indicate that the reservoir earthquakes of Badong section in Three Gorges Reservoir area have close pertinence with karst collapses,and its spatial expansion mechanism is proposed in the paper.
作者
魏东
王孔伟
朱伟
靳宝萍
张帆
WEI Dong;WANG Kongwei;ZHU Wei;JIN Baoping;ZHANG Fan(Key Laboratory of Geological Hazards in Three Gorges Reservoir（Three Gorges University）,Yichang 44300)
出处
《工程地质学报》
CSCD
北大核心
2018年第4期915-929,共15页
Journal of Engineering Geology
基金
国家自然科学基金重点项目(51439003)资助
关键词
水库地震
高桥断裂
泉水调查
溶洞坍塌
Reservoir earthquake
Gaoqiao fault
Spring survey
Karst collapse
