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砂井载荷浸水试验在深层黄土湿陷评价中的应用研究

潘登丽 胡向阳 赵成 严耿升 邵生俊

潘登丽,胡向阳,赵成,等. 砂井载荷浸水试验在深层黄土湿陷评价中的应用研究[J]. 水文地质工程地质,2023,50(0): 1-10 doi:  10.16030/j.cnki.issn.1000-3665.202206006
引用本文: 潘登丽,胡向阳,赵成,等. 砂井载荷浸水试验在深层黄土湿陷评价中的应用研究[J]. 水文地质工程地质,2023,50(0): 1-10 doi:  10.16030/j.cnki.issn.1000-3665.202206006
PAN Dengli, HU Xiangyang, ZHAO Cheng, et al. Application of sand-well load immersion test to deep loess collapsibility evaluation[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-10 doi:  10.16030/j.cnki.issn.1000-3665.202206006
Citation: PAN Dengli, HU Xiangyang, ZHAO Cheng, et al. Application of sand-well load immersion test to deep loess collapsibility evaluation[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-10 doi:  10.16030/j.cnki.issn.1000-3665.202206006

砂井载荷浸水试验在深层黄土湿陷评价中的应用研究

doi: 10.16030/j.cnki.issn.1000-3665.202206006
详细信息
    作者简介:

    潘登丽(1993-),女,硕士,工程师,主要从事岩土工程勘察方面的工作。E-mail:pandengli@nwh.cn

    通讯作者:

    胡向阳(1971-),男,硕士,正高级工程师,主要从事岩土工程勘察方面的工作。E-mail:0309@nwh.cn

  • 中图分类号: TU41

Application of sand-well load immersion test to deep loess collapsibility evaluation

  • 摘要: 针对深层湿陷性黄土自重湿陷量室内试验结果不准确、测试黄土地基湿陷量的原位试验方法少等不足,基于已有的砂井浸水试验,提出了新的现场试验方法:砂井载荷浸水试验方法。其核心是井底地层在试验压力作用下沉降稳定后,利用井中砂砾石的强透水性,将水直接导入井底湿陷性黄土地层及砂井周围土体,使其快速浸水饱和,以此来测定砂井井底地层的湿陷量和砂井周围黄土的自重湿陷量。通过2组砂井载荷浸水试验,测试了不同压力和浸水条件下不同深度地层的湿陷变形,对比分析了砂井载荷浸水试验和临近场地大型试坑浸水试验,结果表明砂井载荷浸水试验的判定结果与试坑浸水试验一致,说明砂井载荷浸水试验是可行的。砂井载荷浸水试验具有周期短、费用低、场地条件要求低、用水量小等优点,适用于深层黄土湿陷性的研究,对黄土地区(尤其是深层黄土)工程的湿陷性评价有一定的参考意义。
  • 图  1  1号砂井监测点布置图(单位:m)

    Figure  1.  Layout of the monitoring points for No. 1 sand well (unit: m)

    图  2  2号砂井监测点布置图(单位: m)

    Figure  2.  Layout of the monitoring points for No. 2 sand well (unit: m)

    图  3  砂井试验现场

    Figure  3.  Photos of the sand-well test

    图  4  砂井试验全过程流程图

    Figure  4.  Flowchart for the sand-well testing process

    图  5  水分计随时间变化关系曲线

    Figure  5.  Variation curves for moisture sensors with time

    图  6  中心标点的累计变形及单日变形随时间变化曲线

    Figure  6.  Variation curves of the cumulative deformation and single day deformation of the center mark with time

    图  7  浅标点累计变形随时间变化曲线

    Figure  7.  Variation curves for settlement at the shallow marked points with time

    图  8  深标点累计变形随时间变化曲线

    Figure  8.  Deformation curves for the deep marked points

    图  9  室内试验结果

    Figure  9.  Indoor test results

    表  1  试验场地地层

    Table  1.   Lithology of the test site

    地层深度/m土壤类型
    $全新统人工填土({\text{Qh} }^{ml} )$0~1填土
    $上更新统风积土( {\text{Q} }_{\text{3} }^{eol} )$1~9.5黄土
    $上更新统残积土 ({\text{Q} }_{\text{3} }^{el})$9.5~12.6古土壤
    $中更新统风积土 ({\text{Q} }_{\text{2} }^{eol})$12.6~22.8黄土
    $中更新统残积土 ({\text{Q} }_{\text{2} }^{el})$22.8~25.0古土壤
    下载: 导出CSV

    表  2  砂井试验整体方案布置

    Table  2.   Overall scheme of sand-well tests

    试验
    名称
    砂井编号深度/m底面
    位置
    试验压力/kPa
    砂井载荷
    浸水试验
    1号5$ {\text{Q}}_{\text{3}}^{eol} $190
    2号15$ {\text{Q}}_{\text{2}}^{eol} $380
    下载: 导出CSV

    表  3  2个场地不同湿陷性评价方法对比

    Table  3.   Comparison of different evaluation methods for two sites mm

    试验场地常宁基地西安财经学院新校区[2]
    评价方法室内试验砂井试验室内试验试坑浸水试验
    自重湿陷量−2554−2169
    湿陷量−247−28−140−140
    场地湿陷类型自重非自重自重非自重
    地基湿陷等级Ⅱ(中等)Ⅰ(轻微)Ⅱ(中等)Ⅰ(轻微)
    下载: 导出CSV
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  • 收稿日期:  2022-06-06
  • 录用日期:  2022-11-14
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