北京东部区域地下水位变化特征及其对地面沉降的影响研究

GROUNDWATER LEVEL VARIATION AND ITS IMPACT ON LAND SUBSIDENCE IN THE EASTERN AREA OF BEIJING

基于大量地下水位与地面沉降的历史监测数据,对北京东部地面沉降区第四系含水层多年的水位变化特征及其与地面沉降发展的相互关系进行分析。研究表明:1998年以来,研究区第3、4层地下水超采比较严重,是主要的地下水开采层,目前这两层地下水的降落漏斗都在管庄—通州一带;研究区地下水位变化、地下水开采强度的分布以及开采深度的变化都与地面沉降的发展具有较强相关性,地下水的开采是引起该区域地面沉降的重要原因;受地下水开采深度的影响,研究区的地面沉降在逐渐向深部发展,而且深部地层的压缩有逐渐增大的趋势。

Based on a lot of historical monitored data of groundwater and land subsidence,a detailed analysis was performed on the evolutional characteristics of the quaternary aquifer and the relationship between groundwater and the land subsidence in the eastern area of Beijing. The results indicated that the third and the fourth aquifer group were the main groundwater exploitation layers,and they were in a serious over-exploitation state,since 1998. Currently the groundwater funnel is located in the region between Tongzhou and Guanzhuang. Moreover,the land subsidence was found to be closely correlated to the variation of groundwater level,groundwater withdrawal intensity and depth. The excessive withdrawal of groundwater is the major cause of land subsidence. Finally, due to the groundwater exploitation depth change,land subsidence is gradually developing to deep strata,and the amount of compression in the deep strata is also increasing gradually.