ISSN 1000-3665 CN 11-2202/P
    海龙,谭世林,吕勇博,等. 3种草本植物根土复合体力学特性及其护坡效果分析[J]. 水文地质工程地质,2024,51(0): 1-12. DOI: 10.16030/j.cnki.issn.1000-3665.202308033
    引用本文: 海龙,谭世林,吕勇博,等. 3种草本植物根土复合体力学特性及其护坡效果分析[J]. 水文地质工程地质,2024,51(0): 1-12. DOI: 10.16030/j.cnki.issn.1000-3665.202308033
    HAI Long, TAN Shilin, LYU Yongbo, et al. Mechanical properties of three herbaceous root-soil complexes and their slope protection effect[J]. Hydrogeology & Engineering Geology, 2024, 51(0): 1-12. DOI: 10.16030/j.cnki.issn.1000-3665.202308033
    Citation: HAI Long, TAN Shilin, LYU Yongbo, et al. Mechanical properties of three herbaceous root-soil complexes and their slope protection effect[J]. Hydrogeology & Engineering Geology, 2024, 51(0): 1-12. DOI: 10.16030/j.cnki.issn.1000-3665.202308033

    3种草本植物根土复合体力学特性及其护坡效果分析

    Mechanical properties of three herbaceous root-soil complexes and their slope protection effect

    • 摘要: 植物根土复合体力学特性对固土护坡效果影响显著。以海州露天矿野生的紫花苜蓿、马蔺和通奶草为研究对象开展根系拉伸试验和不同根系含量根土复合体剪切试验,分析根系抗拉强度特性及根土复合体的抗剪强度特征;采用简化边坡数值模型,探究不同根系面积比和不同土体厚度的根系边坡浅层破坏防护效果。结果表明:根系抗拉力随根径增加呈幂函数增加,抗拉强度随根径增加呈幂函数减小;根土复合体黏聚力增量和内摩擦角均随根系面积比增加呈增加趋势;试验和算例分析均表明植物均具有最佳固土效率根系面积比,紫花苜蓿、马蔺和通奶草根系最佳根系面积比分别为0.04%、0.08%和0.08%,模拟结果表明边坡最佳土体厚度接近根系入土深度;通奶草根系弯曲形态导致根土啮合作用使其较紫花苜蓿和马蔺根系具有更佳固土效果。研究成果可为矿山生态修复工程中含根量和土层厚度的控制提供参考。

       

      Abstract: Mechanical properties of plant root-soil complexes have a significant effect on the effectiveness of soil consolidation and slope protection. Root tensile test and root-soil composite shear test with different root contents were carried out with wild Medicago sativa L., Iris lactea Pall. var.chinensis (Fisch.) Koidz., and Euphorbia hypericifolia L. in Haizhou open-pit mine to analyze the tensile strength characteristics of the root system and the shear strength characteristics of root-soil composite; then a simplified slope numerical model investigated the shallow damage protection effect of rooted slopes with different root area ratios and soil thicknesses. Results indicate that: Root tensile strength increases as a power function of root diameter, and tensile strength decreases as a power function of root diameter. The incremental cohesion and internal friction angle of the root-soil composite both show an increasing trend with the increase of root area ratio. Both tests and simulations show that plants have optimal root area ratios for soil consolidation efficiency, with optimal root area ratios for Medicago sativa L., Iris lactea Pall. var.chinensis (Fisch.) Koidz., and Euphorbia hypericifolia L. roots of 0.04%, 0.08%, and 0.08%, respectively. The simulation shows that the optimal slope soil thickness was close to the root entry depth. The root-soil meshing effect caused by the curved morphology of the root system of Euphorbia hypericifolia L. leads to better soil consolidation than that of the Medicago sativa L. and Iris lactea Pall. var.chinensis (Fisch.) Koidz. root systems. The results of this study provide basic information for controlling root content and soil thickness in mine ecological restoration projects.

       

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