| 华北地区地下水开采对地壳应力的影响 |
| |
| 引用本文： | 庞亚瑾,张怀,程惠红,石耀霖.华北地区地下水开采对地壳应力的影响[J].地球物理学报,2016,59(4):1394-1402. |
| |
| 作者姓名： | 庞亚瑾 张怀 程惠红 石耀霖 |
| |
| 作者单位： | 中国科学院计算地球动力学重点实验室, 中国科学院大学, 北京 100049 |
| |
| 基金项目： | 国家自然科学基金重大项目(41590865,41590864),中国科学院国际合作创新团队(KZZD-EW-TZ-19)资助. |
| |
| 摘 要： | 近50年来华北地区遭受持续大面积过量开采地下水,已形成区域地下水漏斗、地面沉降、地陷地裂等地质灾害.然而,地下水的抽取减小了地壳的载荷,造成地壳应力场变化,这一点至今尚未被充分认识.为探索华北地区地下水超采对地壳应力场的影响,本文建立了二维有限元模型,定量计算地下水超采引起地壳变形和应力场变化.结果表明:华北地区地下水开采会引起地表抬升达+12.4cm;漏斗区上、中地壳的水平拉应力增量分别达到70kPa和35kPa;而在地下水开采区外围,水平压应力增量达20kPa;而华北地区构造主压应力积累速率约为0.5kPa·a-1.通过对比华北地区1980年前后5级以上地震的分布状况,本文认为地下水开采对区域构造应力场的扰动不可忽略,其卸载过程可能对华北地区大地震孕震过程存在减缓作用.
|
| 关 键 词： | 华北平原 地下水开采 应力场 地震 数值模拟 |
| 收稿时间： | 2015-05-26 |
Changes of crustal stress induced by groundwater over-pumping in North China Plain |
| |
| PANG Ya-Jin,ZHANG Huai,CHENG Hui-Hong,SHI YAO-Lin.Changes of crustal stress induced by groundwater over-pumping in North China Plain[J].Chinese Journal of Geophysics,2016,59(4):1394-1402. |
| |
| Authors: | PANG Ya-Jin ZHANG Huai CHENG Hui-Hong SHI YAO-Lin |
| |
| Institution: | Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing 100049, China |
| |
| Abstract: | It is well known that excessive mining of groundwater has induced surface subsidence in North China, especially in the past 50 years. While how groundwater mining unloads the lithosphere and causes stress changes is not fully understand. In this study, we set up a 2-D finite element model across a groundwater depression zone to quantitatively analyze deformation and crustal stress changes of North China Plain. The numerical results show that the maximum surface vertical uplift is 12.4 cm, extensional stress changes are up to 70 kPa and 35 kPa in upper and lower crust in the groundwater exploration area, respectively; while compressional deformation occurs at the edge of exploration zone with values up to 20 kPa. The annual tectonic stress change is 0.5 kPa. By comparing historical earthquakes (＞M5.0) in North China Plain between two periods 1945—1979 and after 1980—2015, it is preliminary concluded the influence of groundwater unloading is significant, which may to some extent reduce the risk of great earthquakes in North China Plain. |
| |
| Keywords: | North China Plain Groundwater mining Stress field Earthquakes Numerical simulation |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
