吕梁山区马兰黄土抗剪强度参数的区域变化规律及其影响因素试验研究

洪勃, 唐亚明, 冯卫, 陈新建, 冯凡, 周永恒, 尹春旺. 2023. 吕梁山区马兰黄土抗剪强度参数的区域变化规律及其影响因素试验研究. 西北地质, 56(2): 272-282. doi: 10.12401/j.nwg.2022019
引用本文: 洪勃, 唐亚明, 冯卫, 陈新建, 冯凡, 周永恒, 尹春旺. 2023. 吕梁山区马兰黄土抗剪强度参数的区域变化规律及其影响因素试验研究. 西北地质, 56(2): 272-282. doi: 10.12401/j.nwg.2022019
HONG Bo, TANG Yaming, FENG Wei, CHEN Xinjian, FENG Fan, ZHOU Yongheng, YIN Chunwang. 2023. Regional Variation and Influencing Factors of Shear Strength Parameters of Malan Loess in Lüliang Area. Northwestern Geology, 56(2): 272-282. doi: 10.12401/j.nwg.2022019
Citation: HONG Bo, TANG Yaming, FENG Wei, CHEN Xinjian, FENG Fan, ZHOU Yongheng, YIN Chunwang. 2023. Regional Variation and Influencing Factors of Shear Strength Parameters of Malan Loess in Lüliang Area. Northwestern Geology, 56(2): 272-282. doi: 10.12401/j.nwg.2022019

吕梁山区马兰黄土抗剪强度参数的区域变化规律及其影响因素试验研究

  • 基金项目: 陕西省重点产业创新链(群)项目“基于大数据的地质灾害机理及风险评估关键技术研究与应用”(2019ZDLSF07-07-02),中国地质调查局地质调查项目“吕梁山区城镇地质灾害调查”(DD20160276)和“晋陕黄土高原河曲-韩城段灾害地质调查”(DD20190642)联合资助。
详细信息
    作者简介: 洪勃(1987−),男,工程师,博士,主要从事黄土工程地质、灾害地质调查、地质安全评价以及防灾减灾方面的研究工作。E–mail:382492004@qq.com
    通讯作者: 唐亚明(1973−),女,研究员,博士生导师,主要从事地质灾害风险评价、监测预警及其信息化方面的研究工作。E–mail:tangyaming73@suhu.com
  • 中图分类号: P642.3;P642.4

Regional Variation and Influencing Factors of Shear Strength Parameters of Malan Loess in Lüliang Area

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  • 为探索吕梁山区原状马兰黄土抗剪强度参数区域上的变化规律,以该地区29个区县94个取样点的马兰黄土为研究对象,通过直剪试验及其影响因素试验,分析区内马兰黄土抗剪强度参数的空间变化规律,及其抗剪强度参数cφ与天然含水率、天然干密度、增湿含水率、含盐率等影响因素的变化规律。结果表明:在水平地域上,抗剪强度参数cφ表现为东高西低、南高北低;在垂直空间上,表现为从表层向下黏聚力逐渐增大、内摩擦角逐渐降低的趋势;吕梁山东、西两侧原状马兰黄土抗剪强度参数cφ受天然含水率、天然干密度的影响较小,离散程度较大;在天然状态条件下,随着含水率的增加,黏聚力c与增湿含水率具有良好的负指数函数关系,内摩擦角φ与增湿含水率呈负线性关系;在同一含水率条件下,含盐率与抗剪强度参数cφ具有正相关关系;与含盐率相比,增湿含水率对cφ的影响作用更为显著。该研究可为该地区马兰黄土地层的工程建设及防灾减灾工作提供基础和必备条件。

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  • 图 1  黄土高原及研究区范围图(a)与研究区地质图(b)

    Figure 1. 

    图 2  取样点分布图(a)、取样过程示例图(b~e)与研究区马兰黄土质地分类三角图(f)

    Figure 2. 

    图 3  西侧黏聚力统计图(a)、黏聚力IDW插值图(b)与东侧黏聚力统计图(c)

    Figure 3. 

    图 4  西侧内摩擦角统计图(a)、内摩擦角IDW插值图(b)与东侧内摩擦角统计图(c)

    Figure 4. 

    图 5  黏聚力c与取样深度的关系图

    Figure 5. 

    图 6  内摩擦角φ与取样深度的关系图

    Figure 6. 

    图 7  吕梁山区马兰黄土抗剪强度参数(cφ)与天然含水率、天然干密度的关系图

    Figure 7. 

    图 8  不同地区马兰黄土增湿含水率对抗剪强度参数cφ的关系曲线图

    Figure 8. 

    图 9  抗剪强度参数cφ与含盐率、增湿含水率的关系图

    Figure 9. 

    图 10  原状黄土cφ与含水率、含盐率的相关关系分析图

    Figure 10. 

    表 1  研究区马兰黄土物理力学指标统计结果表

    Table 1.  Statistical results of physical and mechanical indexes of Malan loess in the study area

    区域指标含水率w (%)干密度ρd(g/cm3相对
    密度Gs
    孔隙比e饱和度Sr(%)液限wL(%)塑限wP(%)塑性指数Ip(%)内摩擦角φ (°)内聚力c (kPa)
    东侧最小值2.751.262.620.717.5211.4025.728.3221.714.88
    最大值18.141.842.771.5061.4220.2046.3927.8439.4061.52
    平均值9.631.432.671.0524.6117.2731.8714.6130.7526.64
    标准差3.960.120.040.1910.851.913.894.094.1513.36
    变异系数0.41140.08200.01410.18390.44070.11030.12190.27990.13490.5016
    西侧最小值2.951.302.350.492.663.6625.616.872.550.85
    最大值19.151.882.851.2351.7528.1040.7534.1044.9788.62
    平均值9.111.482.671.0125.0017.8331.4313.6027.1322.44
    标准差2.880.110.100.258.834.152.465.019.2819.42
    变异系数0.31610.07390.03740.24690.35310.23300.07810.36840.34190.8657
      注:表中数据由长安大学地质工程与测绘学院实验中心测试完成(2016~2020年)。
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收稿日期:  2022-03-25
修回日期:  2022-09-23
刊出日期:  2023-04-20

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