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

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

闫星光^{1, 2, 3,},
卢泽昌^{1, 2, 3, ,},
张进才^{1, 2, 3},
赵伟玲^{1, 2, 3},
陈勇^{1, 2, 3},
雒寒梦^{2, 3},
褚立峰^{1, 2, 3}

1.
河北沧州平原区地下水与地面沉降国家野外科学观测研究站，河北沧州　061000
2.
河北省地质环境监测院，河北石家庄　050022
3.
河北省地质资源环境监测与保护重点实验室，河北石家庄　050022

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

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出版历程
- 收稿日期: 2022-07-12
- 录用日期: 2022-12-16
- 修回日期: 2022-12-04

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

YAN Xingguang^{1, 2, 3
,},
LU Zechang^{1, 2, 3
, ,},
ZHANG Jincai^{1, 2, 3},
ZHAO Weiling^{1, 2, 3},
CHEN Yong^{1, 2, 3},
LUO Hanmeng^{2, 3},
CHU Lifeng^{1, 2, 3}

1.
Hebei Cangzhou Groundwater and Land Subsidence National Observation and Research Station, Cangzhou, Hebei　061000, China
2.
Hebei Geo-environment Monitoring Institute. Shijiazhuang, Hebei　050022, China
3.
Hebei Key Laboratory of Geological Resources and Environment Monitoring and Protection, Shijiazhuang, Hebei　050022, China

摘要

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。
- 雄安新区 /
- 土体物理指标 /
- 固结状态 /
- 分层监测 /
- 成因讨论
Abstract: In order to deeply study the main controlling factors of land subsidence in the northeast of the Xiong’an New Area and effectively slow down the rapid development trend of land subsidence, it is necessary to put forward targeted prevention and control countermeasures. In this paper, the layered monitoring points are taken as the research object. Core samples are used to carry out conventional tests, high-pressure consolidation tests and layered settlement observation. Based on the previous research results, the causes of land subsidence are discussed. The results show that the total thickness of the Quaternary loose layer in the study area is 412 m, and the thickness of the shallow layer is 170 m. The viscous soil accounts for 66.4%−80.2%. The structure is loose and the sand-clay interlayer alternates frequently, and the water release condition is good. The shallow viscous soil has finer particles, good sortability, large porosity, and more than 0.25 liquid index, showing a soft plastic and plasticable state. The dead weight compression coefficient ranges from 0.03 to 0.43, with an average value of 0.07. Compared with the deep soil, the shallow viscous soil is of stronger compressibility. The shallow cohesive soil layer is dominated by underconsolidation, normal consolidation and underconsolidation. The average OCR of a depth of 0−90 m is 0.55, and that of 90-280 m is 0.89. Plastic deformation and permanent settlement are easy to occur. From December 2020 to December 2021, the total subsidence of the strata above the Quaternary in the study area was 61 mm. Among them, the subsidence contribution of the shallow Quaternary unconsolidated layer at a depth of 0−160 m is the largest, which is 42 mm, showing the characteristics of plastic deformation. The subsidence contribution of the deep Quaternary strata at 160−415 m is 19 mm, which shows the characteristics of viscoelastic-plastic deformation. The plastic deformation of cohesive soil layer with low consolidation and high compressibility caused by the excessive exploitation of shallow groundwater is the main cause of serious settlement in this area.
- Xiong’an New Area /
- material index of soil mass /
- consolidation state /
- layered monitoring /
- cause of land subsidence discussion

HTML全文

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

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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

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图 3 含水组厚度及砂黏比例图

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

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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

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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

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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

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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

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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

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图 9 研究区各层段沉降贡献图

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

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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

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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

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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

下载: 全尺寸图片幻灯片

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