紫花苜蓿和通奶草根土复合体的力学特性

海龙; 谭世林; 徐博

doi:10.13961/j.cnki.stbctb.2023.06.008

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紫花苜蓿和通奶草根土复合体的力学特性

试验研究

- 紫花苜蓿和通奶草根土复合体的力学特性
- Mechanical Properties of Medicago Sativa and Euphorbia Hypericifolia Root-Soil Complex
- 水土保持通报 2023年43卷第6期页码：57-64
- 作者机构：
  
  辽宁工程技术大学力学与工程学院,辽宁,阜新,123000
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目“随机扰动下深部软岩渗流—蠕变损伤破裂耦合机理研究”（52274084）
- DOI：10.13961/j.cnki.stbctb.2023.06.008
  中图分类号： TU432
- 纸质出版：2023
- 稿件说明：
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海龙, 谭世林, 徐博. 紫花苜蓿和通奶草根土复合体的力学特性[J]. 水土保持通报, 2023,43(6):57-64.

Hai Long, Tan Shilin, Xu Bo. Mechanical Properties of Medicago Sativa and Euphorbia Hypericifolia Root-Soil Complex[J]. Bulletin of Soiland Water Conservation, 2023, 43(6): 57-64.
海龙, 谭世林, 徐博. 紫花苜蓿和通奶草根土复合体的力学特性[J]. 水土保持通报, 2023,43(6):57-64. DOI： 10.13961/j.cnki.stbctb.2023.06.008.

Hai Long, Tan Shilin, Xu Bo. Mechanical Properties of Medicago Sativa and Euphorbia Hypericifolia Root-Soil Complex[J]. Bulletin of Soiland Water Conservation, 2023, 43(6): 57-64. DOI： 10.13961/j.cnki.stbctb.2023.06.008.

摘要

[目的] 研究土壤含水率、根系面积比对紫花苜蓿（Medicago sativa）和通奶草（Euphorbia hypericifolia）根系固土效果影响及根土间作用机理，为矿山生态修复中植物种类的选取，土壤含水率的控制提供科学依据。[方法] 以辽宁省阜新市海州露天矿边坡野生紫花苜蓿、通奶草为研究对象。开展植物根系拉伸试验，确定根系抗拉特性。开展根土复合体剪切试验，确定2种植物根系最适宜含水率。在最优含水率基础上开展根土复合体剪切优化试验，确定最佳固土效率根系面积比。[结果] ①2种植物根系抗拉力随根径呈幂函数增加，抗拉强度随根径呈幂函数减小。②素土和2种根土复合体黏聚力随含水率增加呈先增加后减小趋势，内摩擦角随含水率增加呈减小趋势； ③紫花苜蓿根系、通奶草根系在含水率分别为25%和21%时，固土效果最佳。④在最优含水率下，紫花苜蓿、通奶草根系面积比分别为0.04%和0.08%时，固土效果最佳。[结论] 通奶草根系的形态学效应和力学效应使其成为较紫花苜蓿根系具有更佳固土效果的优势物种。

Abstract

[Objective] The effects of soil moisture content and root area ratio on the soil consolidation effect of Medicago sativa and Euphorbia hypericifolia root systems and the interaction mechanism of root-soil were studied in order to provide scientific basis for selecting plant species and controlling soil moisture content in ecological restoration of mines. [Methods] Wild M. sativa and E. hypericifolia were observed on a Haizhou open pit mine slope in Burin City

Liaoning Pvocince. Tests were conducted to determine the tensile properties of the root systems. The root-soil complex shear test was used to determine the optimum moisture content of the root systems of the two plants. The root-soil composite shear optimization test was conducted based on the optimal moisture content to determine the optimal root area ratio for soil consolidation efficiency. [Results] ① The tensile resistance of the root systems of the two species increased as a power function of root diameter. The tensile strength of the root systems decreased as a power function of root diameter. ② The cohesive force of the vegetative soil and the two root-soil complexes tended to increase and then decrease with increasing moisture content

and the angle of internal friction tended to decrease with increasing moisture content. ③ The M. sativa and E. hypericifolia root systems had the greatest soil consolidation effect when the moisture content was 25% and 21%

respectively. ④ At the optimal moisture content

the greatest soil consolidation efficiency was achieved when the root area ratios of the M. sativa and E. hypericifolia root systems were 0.04% and 0.08%

respectively. [Conclusion] The morphological and mechanical effects of the E. hypericifolia root system made it the superior species because of its greater soil consolidation than the M. sativa root system.

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