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雄安新区东北部地面沉降成因探讨

闫星光 卢泽昌 张进才 赵伟玲 陈勇 雒寒梦 褚立峰

闫星光,卢泽昌,张进才,等. 雄安新区东北部地面沉降成因探讨[J]. 水文地质工程地质,2023,50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207019
引用本文: 闫星光,卢泽昌,张进才,等. 雄安新区东北部地面沉降成因探讨[J]. 水文地质工程地质,2023,50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207019
YAN Xingguang, LU Zechang, ZHANG Jincai, et al. A discussion of the cause of land subsidence in the northeast of the Xiong’an New Area[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207019
Citation: YAN Xingguang, LU Zechang, ZHANG Jincai, et al. A discussion of the cause of land subsidence in the northeast of the Xiong’an New Area[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207019

雄安新区东北部地面沉降成因探讨

doi: 10.16030/j.cnki.issn.1000-3665.202207019
基金项目: 雄安新区资源环境承载能力综合监测和透明雄安数字平台建设(DD20189142);河北省地面沉降监测(13000021ERSLSM726QL5K)
详细信息
    作者简介:

    闫星光(1989—),男,硕士研究生,工程师,主要从事地面沉降、地裂缝监测与防治。E-mail:yanxg1989@126.com

    通讯作者:

    卢泽昌(1981—),男,高级工程师,主要从事地面沉降、地裂缝监测与防治。E-mail:luzechang521@163.com

  • 中图分类号: 中图分类号: 文献标志码: 文章编号:

A discussion of the cause of land subsidence in the northeast of the Xiong’an New Area

  • 摘要: 为深入研究雄安新区东北部地面沉降主控因素,有效减缓地面沉降快速发展趋势,提出针对性防控对策。本文以大营镇分层标组为研究对象,利用常规土工试验、高压固结试验与分层沉降观测数据,结合前人研究成果对本区地面沉降成因进行探讨。结果表明:研究区第四系松散层总厚度412 m,其中浅部地层(第I、II含水组)厚度约170 m,黏性土占比66.4%~80.2%,结构松散,砂黏互层交替频繁,释水条件较好。浅部黏性土颗粒较细、分选性好、孔隙度大,液性指数多大于0.25,呈软塑、可塑态,自重压缩系数为0.03~0.43,均值0.08,与深部相比压缩性较强。浅部黏性土层以欠固结、正常固结夹欠固结状态为主,0~90 m超固结比均值0.55,90~280 m均值0.89,易于发生塑性变形,形成永久性沉降。2020年12月—2021年12月,研究区第四系以上地层总沉降量为61 mm。其中,0~160 m第四系松散层沉降贡献量最大,为42 mm,表现为塑性形变特征;160~415 m第四系地层沉降贡献量小,为19 mm,表现为黏弹塑性形变特征。过量开采浅层地下水引起浅部固结程度低、压缩性高的黏性土层发生塑性变形是本区发生严重沉降的主要原因。
  • 图  1  研究区地面沉降平均速率图(据马峰[24]改编)

    Figure  1.  Average land subsidence rate in the study area

    图  2  大营镇分层标工程地质孔G1岩性组构特征图

    Figure  2.  Lithologic fabric characteristic diagram of the layered monitoring well G1 in Daying Town

    图  3  含水组厚度及砂黏比例图

    Figure  3.  Diagram showing aquifer thickness and clay-sandy soil scale

    图  4  黏性土各粒径占比随深度变化曲线图

    Figure  4.  Curves of each particle size of clay soil with depth

    图  5  不同含水组黏性土颗粒配级曲线图

    Figure  5.  Particle size distribution curve of clayey soil in different aquifer groups

    图  6  黏性土物理性质参数随深度变化曲线图

    (注:压缩系数150 m以浅为实测数据,150 m以深为高压固结试验e-p曲线截取)

    Figure  6.  Curves of physical property parameters of clay with depth

    图  7  G1孔黏性土固结状态随深度变化曲线图

    Figure  7.  Curves of consolidation state of cohesive soil with depth in G1

    图  8  大营镇分层标组各层形变曲线图

    Figure  8.  Deformation curve of the layered monitoring results in Daying Town

    图  9  研究区各层段沉降贡献图

    Figure  9.  Subsidence contribution of each layer in the study area

    图  10  大营镇分层标组地层形变与水位关系图

    Figure  10.  Relationship between formation deformation and groundwater levels in Daying Town

    图  11  大营镇分层标组地层单位厚度年均沉降量图

    Figure  11.  Average annual subsidence of unit layer in Daying Town

    图  12  雄安新区浅层、深层地下水水位历时曲线(据马震[23]修改)

    Figure  12.  Chanes of groundwater levels in the Xiong’an New Area with time

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  • 收稿日期:  2022-07-12
  • 录用日期:  2022-12-16
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