北京温榆河冲洪积扇地面沉降特征及机理研究  

Land subsidence on the Wenyu River alluvial fans, Beijing

作　　者：王荣[1] 罗勇[1] 杨艳[1,2] 周毅[1,2] 刘明坤[1] 

机构地区：[1]北京市水文地质工程地质大队,北京100195 [2]北京大学地球与空间科学学院,北京100871

出　　处：《上海国土资源》2014年第4期44-48,共5页Shanghai Land & Resources

基　　金：北京市委组织部优秀人才培养资助项目(z131100005613022);中国地质调查局地质调查项目(水[2013]01-032-004);北京市科委科研项目(Z131100005613022)

摘　　要：北京区域地面沉降呈快速发展趋势,局部最大形变速率超过13cm/a,严重威胁城市安全。掌握地下水开采条件下的分层地面沉降特征,是定量揭示地面沉降机理和缓解沉降灾害的前提。以北京最大的地面沉降区温榆河冲洪积扇地区的八仙庄沉降区为研究对象,分析了该地区地下水开采、地下水位动态特征与分层压缩量的关系,基于分层沉降数据得出该地区土体释水形变以浅部地层、深部地层的弹性形变以及中深部地层的弹塑性形变为主,并从地层条件、固结历史和物理力学性质方面对压缩特性的影响因素进行了分析,得出以地面沉降为约束条件的地下水开采主要调控层分布。Land subsidence is developing rapidly in Beijing. The maximum deformation rate has reached 13 cm/year and this threatens urban safety. Research into the subsidence characteristics of the different layers is being used to quantitatively study the mechanisms of land subsidence and the serious problems associated with slow subsidence. This paper investigates the area with the largest cumulative subsidence （Baxianzhuang on the Beijing Wenyu River al uvial fans） and analyses the relationships among groundwater pumping, the dynamic characteristics of groundwater, and layer compaction. We will consider the elastic deformation of the shallow and deep layers, and elastic-plastic deformation of deep layers, fol owing water release, using multilayer compaction data. By analyzing the impact of the nature of the layers, consolidation history, and physical and mechanical properties of compaction, we aim to determine the main regulating layer of groundwater pumping under the present land subsidence scenario.

关 键 词：冲洪积扇 地面沉降 地下水开采 弹塑性形变 固结历史 

分 类 号：P642.26[天文地球—工程地质学]