根土复合体与岩体接触面剪切试验
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TU43

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国家重点研发计划项目(2021YFC3001002);中国铁路广州局集团有限公司科技研究开发计划(2022K057-Z)


Study on the Shear Test of the Contact Surface between Root Soil Composite and Rock Mass
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    摘要:

    为了研究岩质边坡生态防护中根土复合体与岩石接触面抗剪强度形成机理及影响因素,通过构建不同植物种类、护坡土体类型与岩石风化程度的根土复合体-风化基岩接触面物理模型,开展了天然应力条件下根土岩接触面直接剪切试验,揭示了接触面抗剪强度-剪切位移曲线变化规律,分析了植物根系形态、护坡土体类型、岩石风化程度对接触面抗剪强度的影响机理。结果表明,植物根系通过加固护坡土体和伸入基岩裂隙,显著提高了剪切带土体抗剪强度与土岩交界面抗滑移能力,增强了护坡土体与岩石整体性;接触面抗剪强度与植物根系竖向延伸程度及岩石风化程度正相关,相较于无植物工况,当种植香根草时峰值抗剪强度提高了53.9%,强风化基岩条件下提高峰值强度达22.4%;相较于普通土,添加有粘合剂与团粒剂的基材土可显著提高土体抗剪性能及土岩交界面摩阻力,提升接触面峰值抗剪强度达20.1%。无植物和种植狗牙根后剪切过程中呈现出剪切硬化特征,而种植香根草后剪切过程呈现出剪切软化的特征。

    Abstract:

    Addressing the issue of the formation mechanism and influencing factors of the shear strength of the contact surface between the root soil composite and rock in the ecological protection of rock slopes, this study aims to reveal the shear stress-displacement changes of the contact surface, highlighting the influence of root morphology, soil types and rock weathering degree on the shear strength of the contact surface. In this study, a physical model of the contact surface between the root soil composite and weathered bedrock is constructed considering different plant species, soil types, and rock weathering degree. And the direct shear tests are applied on the contact surface between the root, soil and rock under natural stress conditions. The results show that the shear resistance strength of soil in the shear zone and the anti-slip capacity of the contact surface of soil and rock are significantly improved by plant root for its reinforcement on the soil and reaching into the bedrock fissures, and finally enhancing the integrity of soil and rock. Compared to the no plant condition, the shear strength of the contact surface under plant condition is positively correlated with the vertical extension of roots and the degree of rock differentiation, and its peak shear strength increases by 53.9% when planting Vetiver grass. The peak shear strength also increases by 22.4% while the Vetiver grass is planted under strongly weathered bedrock conditions. Compared to ordinary soil, the shear resistance of the soil and the friction resistance of the contact surface are significantly improved by adding the binder and aggregate agent to the substrate soil, and the peak shear strength of the contact surface increases by 20.1%. The shear hardening characteristics were observed during the shearing process after planting no plants and Bermuda grass, while the shear softening characteristics were observed during the shearing process after planting Vetiver grass.

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程鹏,谢玉江,张文生,等. 根土复合体与岩体接触面剪切试验[J]. 科学技术与工程, 2025, 25(14): 6009-6015.
Cheng Peng, Xie Yujiang, Zhang Wensheng, et al. Study on the Shear Test of the Contact Surface between Root Soil Composite and Rock Mass[J]. Science Technology and Engineering,2025,25(14):6009-6015.

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历史
  • 收稿日期:2024-06-13
  • 最后修改日期:2025-04-30
  • 录用日期:2024-11-17
  • 在线发布日期: 2025-05-22
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