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  张淑亮,李宏伟,吕芳,陈慧.基于数值模拟与含水层垂向应力反演的静乐井水位异常分析[J].震灾防御技术,2019,14(4):854-868, DOI:10.11899/zzfy20190417.

基于数值模拟与含水层垂向应力反演的静乐井水位异常分析
摘要:    利用数值模拟与含水层垂向应力反演的方法,对降雨与河流荷载作用下静乐井区应力进行定量计算,并从区域应力场与同一构造区其他前兆测项变化特征对2种方法计算结果进行分析。数值模拟结果显示,降雨与河流荷载的共同作用使静乐井所在区域产生的最大垂向位移约为0.7mm,最大垂向应力约为30hPa;同时段静乐井-含水层垂向应力反演结果显示静乐井-含水层最大垂向应力约为79hPa;数值模拟与静乐井-含水层垂向应力反演结果均表明,静乐井水位高值异常与同时段降雨量增多、河流荷载效应增强关系密切,但2种结果存在一定差异。通过可反映井区应力场变化特征的山西地震带3级地震缺震和b值、穿过静乐井的GPS基线、地震矩释放、同一构造单元同时段其他前兆测项与静乐井水位高值异常对比等分析结果可知,2017年静乐井水位高值异常期间井区应力场存在显著异常,推测静乐井水位高值异常除受降雨与河流荷载作用的影响外,也可能受构造活动增强的影响。
作者单位
张淑亮 山西省地震局, 太原 030021 
李宏伟 山西省地震局, 太原 030021 
吕芳 山西省地震局, 太原 030021 
陈慧 山西省地震局, 太原 030021 
关  键  词:数值模拟  井-含水层垂向应力  静乐井水位  高值异常  构造活动
DOI:10.11899/zzfy20190417
基金项目:山西省地震局科技攻关项目(201903D321013)(SBK-1936;SBK-1936-3);中国地震局震情跟踪项目(2018020304)
收稿日期:2019-07-05
作者简介:张淑亮,女,生于1963年。正研级高级工程师。主要从事地震综合预测与研究工作。E-mail:zzsl_009@163.com
通讯作者:
Analysis of the Jingle Well Water-level Anomaly Based on Numerical Simulation and Aquifer Stress Inversion
Abstract:      Using the methods of numerical simulation and aquifer stress inversion, we calculate the stress values in Jingle well area under rainfall and river load. The calculation results of the two methods are analyzed from the regional stress field and other precursor observation values in the same tectonic area. The numerical simulation results show that the maximum vertical displacement and the maximum vertical stress caused by the combined load of river and rainfall are about 0.7mm and 30 hPa. At the same time, the inversion results of the vertical stress of the interval well-aquifer show that the maximum vertical stress of Jingle well-aquifer is about 79 hPa. Both numerical simulation and vertical stress inversion results of well-aquifer show that the abnormal high water level of Jingle well is closely related to the increase of rainfall and the enhancement of river load effect in the same period, but there are certain differences between the two results. Through the comparative analysis of the magnitude 3 earthquake deficiency and earthquake b value in Shanxi seismic belt, GPS baseline passing through jingle well, earthquake moment release, other precursor observation values of the same structural unit and the anomaly of jingle well water level high value, which can reflect the variation characteristics of the well stress field, it is found that there are significant anomalies in the well stress field during the anomaly of jingle well water level high value in 2017. It is speculated that the anomaly of jingle well water level high value not only is influenced by river and rainfall load, but also contains the factors of structural activity enhancement.
Keywords:  Numerical simulation  Vertical stress of well-aquifer  Jingle well water level  High value anomaly  Tectonic activity
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