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

Li Pengcheng; Zhong Caiyi; He Bo; Xiao Xuepei; Wu Lizhou

doi:10.13961/j.cnki.stbctb.20221012.001

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

- Experimental Research on Strength of Root-Soil Composites and Their Nonlinear Characteristics
- Bulletin of Soiland Water Conservation Vol. 43, Issue 2, Pages: 95-103(2023)
- 作者机构：
  
  1. 成都理工大学环境与土木工程学院,四川,成都,610059
  2. 四川省公路规划勘察设计研究院有限公司,四川,成都,610041
  3. 重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆,400074
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20221012.001
  CLC： TU411.7
- Published：2023
- 稿件说明：
移动端阅览
Li Pengcheng, Zhong Caiyi, He Bo, et al. Experimental Research on Strength of Root-Soil Composites and Their Nonlinear Characteristics[J]. Bulletin of Soiland Water Conservation, 2023, 43(2): 95-103.
DOI：

Li Pengcheng, Zhong Caiyi, He Bo, et al. Experimental Research on Strength of Root-Soil Composites and Their Nonlinear Characteristics[J]. Bulletin of Soiland Water Conservation, 2023, 43(2): 95-103. DOI： 10.13961/j.cnki.stbctb.20221012.001.

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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