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首页 > 过刊浏览>2023年第43卷第2期 >95-103. DOI:10.13961/j.cnki.stbctb.20221012.001
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根—土复合体强度及其非线性特性试验研究
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TU411.7

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国家自然科学基金项目“青藏高原东缘地形急变带山地生态—水文过程与山地灾害互馈机制及灾害风险调控”(41790432)； 国家自然科学基金面上项目“川藏铁路地形急变带非饱和堆积物非线性入渗演化及失稳研究”(42277183)


Experimental Research on Strength of Root-Soil Composites and Their Nonlinear Characteristics
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    摘要:

    [目的] 研究根—土复合体的非线性破坏准则，并结合不同含根量(G=0.12%，0.24%，0.36%)、不同含水率(w=13.22%，16.22%，19.22%)条件下根—土复合体强度，开展根—土复合体非线性特性研究，为生态水土防治工作提供科学参考。 [方法] 采用GDS三轴仪开展了根—土复合体的固结不排水三轴试验，获得根—土复合体应力—应变曲线及抗剪强度指标。 [结果] 素土与根—土复合体应力—应变关系曲线为硬化型。含根量与根—土复合体峰值强度成正比关系，但含水率对其峰值强度的影响表现出反比关系。当G=0.36%时，根—土复合体峰值强度的最大增幅为70.1%；当w=13.22%时，根—土复合体峰值强度最大增幅为86.7%。根—土复合体非线性破坏准则在正应力低于临界应力时呈非线性，在正应力高于临界应力时呈线性。c，k为根—土复合体非线性破坏准则中描述根系作用的关键参数，其中c与含根量和含水率均成正比关系，c越大，根系对根—土复合体强度的贡献程度越大；k与含根量成反比，与含水率成正比，k越小，根—土复合体强度包线的非线性化特征越明显。 [结论] 含根量(G)和含水率(w)对根—土复合体强度有显著影响。素土与根—土复合体的应力—应变关系曲线均呈硬化型，且根—土复合体的硬化程度明显高于素土，表明根系的加入能够同时增大土体的强度和刚度。

    Abstract:

    [Objective] A nonlinear failure criterion of root-soil composites and the nonlinear characteristics of root-soil composites was studied combining with the strength of root-soil composites under three root content conditions (G=0.12%, 0.24%, and 0.36%) and three moisture content conditions (w=13.22%, 16.22%, and 19.22%). [Methods] The GDS triaxial apparatus was used to conduct consolidated-undrained triaxial tests to obtain the stress-strain curves and shear strength parameters of root-soil composites. [Results] Unreinforced soil and root-soil composite stress-strain curves exhibited characteristics of hardening. Additionally, moisture content was negatively correlated with the peak stress of rooted soil, while root content was positively correlated. Under the condition of G=0.36%, 70.1% was the maximum increase of peak strength of the root-soil composite. When w=13.22%, the peak strength of the root-soil composite increased by a maximum of 86.7%. The nonlinear failure criterion of root-soil composites was nonlinear when the normal stress was lower than the critical stress, and linear when the normal stress was higher than the critical stress. The key parameters that described the effect of roots in the nonlinear failure criterion were c and k. c had a positive correlation with root content and moisture content. The contribution of roots in rooted soil shear strength increased with increasing c. Moreover, k was positively correlated with root content and negatively correlated with moisture content. The smaller the value of k, the more obvious the nonlinear characteristic of the strength envelope of the root-soil composite. [Conclusion] The strength of root-soil composites is greatly influenced by root content and moisture content. The stress-strain relationship curves of both unreinforced soil and root-soil composite showed a hardening type, and the hardening degree of the root soil composite is significantly higher than that of unreinforced soil, indicating that the addition of roots can simultaneously increase the strength and stiffness of the soil.

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李鹏程,钟彩尹,何博,肖学沛,吴礼舟.根—土复合体强度及其非线性特性试验研究[J].水土保持通报,2023,43(2):95-103

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  • 收稿日期:2022-07-01
  • 最后修改日期:2022-08-26
  • 在线发布日期: 2023-06-01

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