基于观测环境的洞体应变压性异常综合研究  

Comprehensive Study on Compressive Anomaly of Cave-Strain Based on Observation Environment

作　　者：刘莉[1] 郑海刚[1] 李军辉[1] 倪红玉[1] 周冬瑞 LIU Li;ZHENG Haigang;LI Junhui;NI Hongyu;ZHOU Dongrui(Anhui Earthquake Agency,558 West-Changjiang Road,Hefei 230031,China)

机构地区：[1]安徽省地震局,合肥市230031

出　　处：《大地测量与地球动力学》2023年第9期980-985,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局震情跟踪定向工作任务(2022010219);安徽省地震局科研创新团队。

摘　　要：从观测环境角度出发,通过对金寨台气象因素进行回归分析发现,气温、气压与洞体应变之间虽存在线性关系,但拟合结果与洞体应变压性下降实际观测应变变化量相差较大;洞体应变压性下降起始时间与梅山水库开始泄洪、下游史河水位陡升时间存在较强的相关性。三维不规则载荷模型数值模拟结果显示,洞体应变压性异常的前期快速下降变化与同期梅山水库载荷变化的相关性较小,与史河水位变化有较大相关性;洞体应变压性异常发生前后研究区构造应力场未发生显著变动。由此推定,金寨台洞体应变压性下降异常可能是周边场地环境载荷变化的影响所致。From the perspective of observation environment,through the regression analysis of meteorological factors,we find that although there is a linear effect between temperature change,pressure change and strain change,the fitting results are quite different from the actual observed strain change when the strain pressure drops.There is a strong correlation between the start time of the decline and the time when the Meishan reservoir starts to discharge and the time when the water level of the downstream Shihe river rises sharply.The numerical simulation results of the three-dimensional irregular load model show that the early rapid decline of the anomalous strain compressibility of the cave body has little correlation with the load change of the Meishan reservoir in the same period,and has a large correlation with the water level change of the Shihe river.The tectonic stress field in the study area did not change significantly before and after the occurrence of cave-strain and compressive anomaly.Therefore,we preliminarily infer that the abnormal drop of strain and pressure in Jinzhai station cave may be caused by the environmental load changes in the surrounding sites.

关 键 词：洞体应变 压性异常 气象 载荷 构造应力场 

分 类 号：P315[天文地球—地震学]