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

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

    • 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。

       

      Abstract: This paper aims to assess the contribution of roots of inter-planted herbaceous in reinforcing dump-slope soil in alpine mining areas and improving slope stability. It selects Jiangcang mining sites in Muli mining area as the testing area,where herbs of Elymus nutans Griseb. and Poa crymophila Keng are inter-planted. It uses a series of mechanical experiments to rooted soil as well as soil without root and determines,the physical and mechanical indices of the rooted soil as well as soil without root. It further conducts the Pearson correlation analysis to identify the correlation among cohesion of soil samples(rooted soil and soil without root),soil density,soil moisture content and root content. Results shows that the soil density of rooted soil,can decline from 0.13 to 0.21g ·cm-3 with the corresponding declining percent of 6.31%~11.05%,while moisture content and cohesion can increase from 0.40% to 2.91%(with the increase percent of 4.47%~26.11%) and from 1.18 to 10.58 kPa(with the increase percent of 5.77%~62.11%),respectively. In contrast to the soil without root,indicating inter-planted herbs roots are more capable in reinforcing loose soil and improving slope stability. Pearson correlation analysis shows cohesion in vegetated slopes is positively correlated with its root content(P<0.05). Its correlation coefficient value is absolutely higher than the counterparts of soil density,and moisture content,which suggests a closer relationship between root content and soil cohesion. This conclusion can be used as a reference in the projects of alpine mining area ecological restoration and has a theoretical and practical values in geo-hazards prevention and control.

       

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