高寒矿区排土场植被恢复对边坡土体物理力学性质影响研究

闫聪 胡夏嵩 李希来 刘昌义 卢海静 付江涛 许桐 申紫雁

闫聪, 胡夏嵩, 李希来, 等. 2022. 高寒矿区排土场植被恢复对边坡土体物理力学性质影响研究[J]. 工程地质学报, 30(2): 383-393. doi: 10.13544/j.cnki.jeg.2021-0560
引用本文: 闫聪, 胡夏嵩, 李希来, 等. 2022. 高寒矿区排土场植被恢复对边坡土体物理力学性质影响研究[J]. 工程地质学报, 30(2): 383-393. doi: 10.13544/j.cnki.jeg.2021-0560
Yan Cong, Hu Xiasong, Li Xilai, et al. 2022. Experimental study on effects of vegetation restoration on physical and mechanical properties of dump slope soil in alpine coal mine areas[J]. Journal of Engineering Geology, 30(2): 383-393. doi: 10.13544/j.cnki.jeg.2021-0560
Citation: Yan Cong, Hu Xiasong, Li Xilai, et al. 2022. Experimental study on effects of vegetation restoration on physical and mechanical properties of dump slope soil in alpine coal mine areas[J]. Journal of Engineering Geology, 30(2): 383-393. doi: 10.13544/j.cnki.jeg.2021-0560

高寒矿区排土场植被恢复对边坡土体物理力学性质影响研究

doi: 10.13544/j.cnki.jeg.2021-0560
基金项目: 

青海省自然科学基金资助项目 2020-ZJ-906

第二次青藏高原综合科学考察研究资助项目 2019QZKK0905

国家自然科学基金资助项目 42041006

国家自然科学基金资助项目 41572306

教育部长江学者和创新团队发展计划 IRT_17R62

详细信息
    作者简介:

    闫聪(1996-),男,硕士生,主要从事地质灾害防治方面的科研工作. E-mail:qhu_yancong@163.com

    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教学与科研工作. E-mail:huxiasong@tsinghua.org.cn

  • 中图分类号: P642.3

EXPERIMENTAL STUDY ON EFFECTS OF VEGETATION RESTORATION ON PHYSICAL AND MECHANICAL PROPERTIES OF DUMP SLOPE SOIL IN ALPINE COAL MINE AREAS

Funds: 

National Natural Science Foundation of Qinghai Province 2020-ZJ-906

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

the National Natural Science Foundation of China 42041006

the National Natural Science Foundation of China 41572306

the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China IRT_17R62

  • 摘要: 本项研究针对高寒干旱环境下矿山排土场边坡植物增强土体强度和提高边坡稳定性作用贡献,以青海北部木里煤田江仓矿区作为研究区,通过采用组合种植草本垂穗披碱草(Elymus nutans Griseb.)+冷地早熟禾(Poa crymophila Keng)的方式,开展了组合种植植物根-土复合体与不含根系素土物理力学性质指标试验,并采用Pearson相关性分析方法评价了排土场边坡土体黏聚力c值与密度、含水率、含根量指标之间的相关程度。结果表明:相比较于不含根系素土,区内南、北两侧排土场边坡根-土复合体密度降低0.13~0.21g·cm-3,降低幅度为6.31%~11.05%,含水率增加0.40%~2.91%,增加幅度为4.47%~26.11%,根-土复合体抗剪强度指标黏聚力c值增加1.18~10.58 kPa,增加幅度为5.77%~62.11%,表明组合种植草本具有显著增强排土场边坡土体抗剪强度和提高边坡稳定性作用;通过进一步对排土场边坡根-土复合体黏聚力c值影响因素的相关性分析可知,根-土复合体黏聚力c值与含根量之间呈显著正相关关系(P<0.01),且含根量与黏聚力c值间的相关程度明显高于土体密度和含水率。该项研究结果对于高寒干旱环境矿山生态修复与地质灾害防治,具有理论研究价值和现实指导意义。
  • 图  1  研究区地理位置及排土场边坡示意图(据Li et al.(2019)修改)

    Figure  1.  Location of study area and aerial view of the dumps(originated from Li et al. (2019),with minor revision)

    图  2  研究区排土场边坡组合种植草本垂穗披碱草+冷地早熟禾生长情况(植株高者为垂穗披碱草、相对低矮为冷地早熟禾)

    Figure  2.  The growth situation of herbaceous at dump slope in the study area(The higher plant is E. nutans and the shorter one is P. crymophila)

    图  3  研究区排土场边坡实测剖面示意图

    Figure  3.  The slope profile of the dump slope(a denotes the southern slope and b denotes the northern slope)

    图  4  试验区排土场边坡不同取样位置根-土复合体与不含根系素土试样密度变化特征

    Figure  4.  Variation of soil density of rooted soil and soil without root in different sampling positions at the dump slopes

    图  5  试验区排土场边坡不同取样位置根-土复合体与不含根系素土试样含水率变化特征

    Figure  5.  Variation of moisture content of rooted soil and soil without root in different sampling positions at the dump slopes

    图  6  试验区排土场边坡不同取样位置根-土复合体试样含根量变化特征

    Figure  6.  Variation of root content of rooted soil and soil without root in different sampling positions at the dump slopes

    图  7  试验区排土场边坡不同取样位置根-土复合体与不含根系素土试样黏聚力c值变化特征

    Figure  7.  Variation of cohesion of rooted soil and soil without root in different sampling positions at the dump slopes

    图  8  试验区排土场边坡坡面不同取样位置根-土复合体与不含根系素土试样内摩擦角φ值变化特征

    Figure  8.  Variation of internal friction angle of rooted soil and soil without root in different sampling positions at the dump slopes

    表  1  研究区2种草本植物生长量指标统计结果

    Table  1.   Measuring results of growth index of two herbaceous species in the study area

    植物名称 生长量指标平均值
    株高/cm 地径/mm 根径/mm 根数
    垂穗披碱草 48.13±8.67 1.86±0.54 0.25±0.06 13.40±4.64
    冷地早熟禾 32.55±8.03 1.24±0.46 0.20±0.09 16.69±7.38
    下载: 导出CSV

    表  2  试验区排土场边坡不含根系素土黏聚力c值与密度、含水率之间相关性分析结果

    Table  2.   Correlation among cohesion,soil density and moisture content of soil in bare slopes

    取样位置 不含根系素土指标 黏聚力c
    南侧排土场边坡 黏聚力c 1
    密度 0.502*
    含水率 -0.532*
    北侧排土场边坡 黏聚力c 1
    密度 0.613**
    含水率 -0.431*
    表中“**”表示在0.01极显著水平下的相关性,“*”表示在0.05显著水平下的相关性,数值正负分别表示变量间呈正相关和负相关关系
    下载: 导出CSV

    表  3  试验区排土场边坡根-土复合体黏聚力c值与密度、含水率及含根量之间相关性分析结果

    Table  3.   Correlation among cohesion,soil density,moisture content and root content of soil in vegetated slope

    取样位置 根-土复合体指标 黏聚力c
    南侧排土场边坡 黏聚力c 1
    密度 0.371*
    含水率 -0.339*
    含根量 0.431**
    北侧排土场边坡 黏聚力c 1
    密度 0.348*
    含水率 -0.334*
    含根量 0.428**
    表中“**”表示在0.01极显著水平下的相关性,“*”表示在0.05显著水平下的相关性,数值正负分别表示变量间呈正相关和负相关关系
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-04
  • 修回日期:  2022-02-19
  • 刊出日期:  2022-04-25

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