摘要
为研究区域地质构造的地壳应变状态,利用数字高程模型(DEM)数据构建数字化三维地形模型,再添加区域地质岩石属性建立有限元三维地质模型,并施加重力和热荷载,进行有限元与实测应变分析。以九江地震台为例,利用有限元模型及台站实测温度和应变数据,展开区域应变分析。结果表明,有限元建模应变解算结果与实测应变结果较符,均值量级皆为10^(-5),都呈明显的季节性周期变化趋势;模型热应变和定向应变分别能较好地反映温度造成的应变差异和不同方向的应变变化;模型应变能在一定程度上反映区域应变的变化范围和量级大小,有益于缺乏实测应变条件的区域开展应变分析。
To investigate the crustal strain state of the regional geological structure,we construct a digital three-dimensional terrain model using digital elevation model(DEM)data,and we establish a three-dimensional geological model with regional geological rock properties by adding finite element analysis.We apply gravity and thermal loads to conduct finite element and measured strain analysis.Taking the Jiujang Seismic Station as an example,we use finite element modeling and station-measured temperature and strain data to carry out regional strain analysis.The results show that the strain calculation results of finite element modeling are consistent with the measured strain,and the average order of magnitude is 10^(-5),which shows an obvious seasonal periodic change trend.The model’s thermal strain and directional strain reflects the strain differences caused by temperature and the changes in strain in different directions.The model strain can to some extent reflect the range and magnitude of regional strain changes,which is beneficial to the strain analysis of regions with no measured strain conditions.
作者
李萌
卢和雄
赵爱平
严丽
LI Meng;LU Hexiong;ZHAO Aiping;YAN Li(Key Laboratory of Mine Environmental Monitoring and Improving around Poyang Lake,MNR,East China University of Technology,418 Guanglan Road,Nanchang 330013,China;Key Laboratory for Digital Land and Resources of Jiangxi Province,East China University of Technology,418 Guanglan Road,Nanchang 330013,China;Observatory for Geodynamic of the East Yangtze Block in Jiujiang,Jiangxi Province,138 Xingguang Road,Jiujiang 332006,China;Engineering Research Center for Seismic Disaster Prevention and Engineering Geological Disaster Detection of Jiangxi Province,East China University of Technology,418 Guanglan Road,Nanchang 330013,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2023年第10期1063-1067,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41704031)
江西九江扬子块体东部地球动力学野外科学观测研究站开放基金(OGYB202004)
江西省数字国土重点实验室开放基金(DLLJ202213,DLLJ202203)
自然资源部环鄱阳湖区域矿山环境监测与治理重点实验室开放基金(MEMI-2021-2022-29)。
关键词
有限元建模
解算应变
台站实测应变
对比分析
可行性
finite element modeling
strain calculation
station-measured strain
comparative analysis
feasibility
