北京朝阳金盏地区地面沉降垂向分层研究  

Vertical stratification of land subsidence in Jinzhan area,Chaoyang district of Beijing

作　　者：杨艳[1] 罗勇[1] 徐尚志 田苗壮 罗强 田芳[1] YANG Yan;LUO Yong;XU Shangzhi;TIAN Miaozhuang;LUO Qiang;TIAN Fang(Beijing Institute of Hydrogeology and Engineering Geology,Beijing 100195,China;Beijing Institute of Geology,Beijing 100011,China;Beijing Institute of Geological&Prospecting Engineering,Beijing 100048,China)

机构地区：[1]北京市水文地质工程地质大队,北京100195 [2]北京市地质研究所,北京100011 [3]北京市地质工程勘察院,北京100048

出　　处：《上海国土资源》2021年第2期8-13,共6页Shanghai Land & Resources

基　　金：国家重点研发计划课题“城市群地质环境演化多源遥感监测与预警”(2017YFB0503803);北京市自然科学基金项目(8162043);北京市财政重点项目(PXM2019_158305_000012)。

摘　　要：金盏地区位于北京市东部,是北京平原区地面沉降最为严重的地区之一,其所在的北京平原东部沉降区也是全市沉降最显著的地区,沉降速率连续多年超过100mm/a,累计沉降量逐年增大。在金盏地区进行0~300m钻孔取芯实验,通过不同深度岩芯测试数据,系统分析该地区的土体力学性质,揭示地层结构。结合地层年代、岩性、埋藏条件、地下水补径排条件,在垂向上将0~300m地层划分为四个可压缩层,并根据不同可压缩层内地下水水位变化情况,选取可压缩层内2007~2017年不同地层沉降量进行计算,在累计1427.49mm沉降量中,第四可压缩层沉降量最大,达到1038.65mm。研究认为,当地层的砂土厚度较大时,对地面沉降的贡献是不容忽视的。The Jinzhan area,located in eastern Beijing,is a part of the Beijing plain area with the worst land subsidence.It belongs to the eastern subsidence region of the Beijing plain where the subsidence rate is the most significant across the city.The subsidence rate has exceeded 100 mm/a for many consecutive years with an annual growing cumulative subsidence.A core drilling experiment in the Jinzhan area was conducted over a depth interval of 0–300 m.The soil mechanical properties of the area were systematically analyzed through an experiment on core data for different depths,and the local stratigraphic structure was revealed.Based on the stratigraphic chronology,lithology,burial conditions,and groundwater recharge-runoffdischarge conditions,the 0–300 m strata were vertically divided into four compressible layers.The subsidence levels of different strata in each compressible layer from 2007 to 2017 were calculated according to their respective groundwater table variations.For cumulative subsidence of 1427.49 mm,the Quaternary compressible layer made the greatest contribution of 1038.65 mm.Thus,when the sandy soil in the strata is thick,its contribution to land subsidence is never negligible.

关 键 词：地面沉降 分层研究 地层结构 可压缩层 地下水 

分 类 号：P642.26[天文地球—工程地质学]