西宁盆地黄土区边坡土体含水量对植物根-土复合体抗剪强度影响的试验研究

李姜瑶 余冬梅 张西营 胡夏嵩 刘亚斌 周林虎 李丹

李姜瑶, 余冬梅, 张西营, 等. 2022. 西宁盆地黄土区边坡土体含水量对植物根-土复合体抗剪强度影响的试验研究[J]. 工程地质学报, 30(2): 281-292. doi: 10.13544/j.cnki.jeg.2020-006
引用本文: 李姜瑶, 余冬梅, 张西营, 等. 2022. 西宁盆地黄土区边坡土体含水量对植物根-土复合体抗剪强度影响的试验研究[J]. 工程地质学报, 30(2): 281-292. doi: 10.13544/j.cnki.jeg.2020-006
Li Jiangyao, Yu Dongmei, Zhang Xiying, et al. 2022. Effect of soil moisture content on shear strength of rooted soil in loess regions of Xining Basin[J]. Journal of Engineering Geology, 30(2): 281-292. doi: 10.13544/j.cnki.jeg.2020-006
Citation: Li Jiangyao, Yu Dongmei, Zhang Xiying, et al. 2022. Effect of soil moisture content on shear strength of rooted soil in loess regions of Xining Basin[J]. Journal of Engineering Geology, 30(2): 281-292. doi: 10.13544/j.cnki.jeg.2020-006

西宁盆地黄土区边坡土体含水量对植物根-土复合体抗剪强度影响的试验研究

doi: 10.13544/j.cnki.jeg.2020-006
基金项目: 

青海省自然科学基金项目 2020-ZJ-906

青海省自然科学基金项目 2014-ZJ-906

国家自然科学基金项目 41572306

中国科学院“百人计划”项目 Y110091025

第二次青藏高原综合科学考察研究项目 2019QZKK0805

第二次青藏高原综合科学考察研究项目 2019QZKK0905-14

详细信息
    作者简介:

    李姜瑶(1997-),女,硕士生,主要从事地质灾害及其防治研究. E-mail: lijiangyao18@mails.ucas.ac.cn

    通讯作者:

    胡夏嵩(1965-),男,博士,教授,博士生导师,主要从事工程地质与地质灾害防治领域的教学与研究工作. E-mail: huxiasong@tsinghua.org.cn

  • 中图分类号: P642.3

EFFECT OF SOIL MOISTURE CONTENT ON SHEAR STRENGTH OF ROOTED SOIL IN LOESS REGIONS OF XINING BASIN

Funds: 

the Natural Sciences Foundation of Qinghai Province 2020-ZJ-906

the Natural Sciences Foundation of Qinghai Province 2014-ZJ-906

the National Natural Science Foundation of China 41572306

One Hundred Person Project of the Chinese Academy of Sciences Y110091025

the Second Tibetan Plateau Scientific Expedition and Research Program(STEP) 2019QZKK0805

the Second Tibetan Plateau Scientific Expedition and Research Program(STEP) 2019QZKK0905-14

  • 摘要: 为进一步研究植物根系的固土护坡力学效应,探讨边坡土体含水量对植物根系增强土体抗剪强度的影响,以西宁盆地长岭沟流域作为研究区,选取两种优势灌木植物柠条锦鸡儿(Caragana korshinskii Kom.)、白刺(Nitraria sphaerocarpa Maxim.)和两种优势草本植物芨芨草(Achnatherum splendens(Trin.)Nevski)、细茎冰草(Agropyron trachycaulum Linn. Gaertn.)作为供试种,设置土体含水量分别为6%、10%、14%、18%、22% 5种不同梯度条件,制备根-土复合体和不含根系素土扰动试样,并在室内分别进行直剪试验,分析5种含水量条件下根-土复合体抗剪强度指标的变化规律。试验结果表明:4种草本和灌木植物根系具有显著提高边坡土体抗剪切变形的能力,随着含水量梯度的增加,素土与根-土复合体抗剪切变形能力减弱;当土体含水量相同时,与不含根系素土试样相比,根-土复合体的黏聚力普遍大于素土,而其内摩擦角变化相对较小,其中根-土复合体黏聚力的增长量为1.94~12.17 kPa,增长幅度为34.50% ~360.69%;素土与根-土复合体的黏聚力随土体含水量的增加呈二次多项式函数关系递减,且其内摩擦角亦随着含水量增加而降低,当土体含水量由6%增加至22%时,黏聚力降低幅度为28.50% ~61.78%,内摩擦角降幅为38.73%。本项研究成果对于进一步探讨高寒干旱环境草本和灌木根-土复合体抗剪强度的影响因素,以及利用乡土优势植物开展植被护坡具有重要理论研究价值和实际指导意义。
  • 图  1  制取复合体试样所用植物根系与土体试样

    a. 植物根系;b. 土体粒径小于0.25 mm素土

    Figure  1.  Plant roots and soil samples for the preparation of root-soil composite system

    图  2  试验区边坡土体的粒径级配累积曲线

    Figure  2.  Grain size gradation and accumulation curve of slope soil in testing area

    图  3  制备完毕的灌木和草本植物根-土复合体试样

    a. 柠条锦鸡儿根-土复合体;b. 白刺根-土复合体;c. 芨芨草根-土复合体;d. 细茎冰草根-土复合体

    Figure  3.  Preparation of root-soil composite system of shrub and herb species

    图  4  含水量10%条件下素土和根-土复合体剪应力与剪切位移之间的关系

    a. 柠条锦鸡儿根-土复合体; b. 白刺根-土复合体; c. 芨芨草根-土复合体; d. 细茎冰草根-土复合体; e. 素土

    Figure  4.  The influence of different shear displacement on the shear strength between soil without root and rooted soil under the condition of 10% water content

    图  5  不同含水量条件下柠条锦鸡儿根-土复合体剪应力与剪切位移之间的关系

    a. 含水量为6%;b. 含水量为10%; c. 含水量为14%;d. 含水量为18%; e. 含水量为22%

    Figure  5.  The shear displacement connection with shear strength of root-soil composite system of Caragana korshinskii Kom. under different water content

    图  6  素土与根-土复合体黏聚力与含水量之间的变化关系

    Figure  6.  Relationship between cohesion and water content of soil without root and rooted soil

    图  7  素土与4种植物根-土复合体内摩擦角与含水量之间的关系

    Figure  7.  The internal friction angle connection with water content of soil without root and rooted soil

    图  8  灌木与草本植物护坡作用示意图(李国荣等,2007;略作改动)

    Figure  8.  Schematic diagram of shrub and herb slope protection function

    表  1  试验区边坡土体物理性质指标试验结果(刘亚斌等,2020)

    Table  1.   The experiment results of physical properties of slope soil in testing area

    深度
    /cm
    平均干密度
    /g·cm-3
    平均含
    水量/%
    液限
    WL/%
    塑限
    WP/%
    液性
    指数IL
    塑性
    指数IP
    土粒组成/% 不均匀
    系数Cu
    土质
    类型
    0.25~0.075 mm 0.075~0.005 mm <0.005 mm
    0~100 1.25±0.06 9.12 24.6 17.2 -0.97 7.40 30.10 62.6 7.30 3.90 粉土
    下载: 导出CSV

    表  2  试验区素土与4种植物根-土复合体试样黏聚力的增长量和增长幅度计算结果

    Table  2.   The growth amount and amplitude of cohesion of rooted soil in testing area

    试样类型 黏聚力增长量Δc/kPa 黏聚力增长幅度/%
    ω=6% ω=10% ω=14% ω=18% ω=22% ω=6% ω=10% ω=14% ω=18% ω=22%
    素土
    柠条锦鸡儿根-土复合体 12.17 11.89 12.13 11.61 11.47 146.27 184.63 260.86 305.53 360.69
    白刺根-土复合体 9.75 8.63 9.42 8.54 8.01 117.19 134.01 202.58 224.74 251.89
    芨芨草根-土复合体 7.30 6.38 6.24 5.87 5.34 87.74 99.07 134.19 154.47 167.92
    细茎冰草根-土复合体 2.87 2.78 2.43 2.23 1.94 34.50 43.17 52.26 58.68 61.01
    下载: 导出CSV

    表  3  试验区素土与4种植物根-土复合体黏聚力值及其与含水量之间的拟合方程

    Table  3.   The cohesion of soil without root and rooted soil and its fitting equation with water content in testing area

    试样类型 黏聚力c/kPa 拟合方程 相关系数R2
    ω=6% ω=10% ω=14% ω=18% ω=22%
    素土 8.32 6.44 4.65 3.80 3.18 y=12.421 43-0.7705x+0.015 89x2 0.998 28
    柠条锦鸡儿根-土复合体 20.49 18.33 16.78 15.41 14.65 y=24.423 79-0.7375x+0.0133x2 0.999 52
    白刺根-土复合体 18.07 15.07 14.07 12.34 11.19 y=22.764 04-0.916x+0.017 99x2 0.992 57
    芨芨草根-土复合体 15.62 12.82 10.89 9.67 8.52 y=20.417 82-0.923x+0.017 54x2 0.998 01
    细茎冰草根-土复合体 11.19 9.22 7.08 6.03 5.12 y=15.549 54-0.8025x+0.014 87x2 0.997 05
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-01-08
  • 修回日期:  2020-09-02
  • 刊出日期:  2022-04-25

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