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基于新型拉伸装置的根-土复合体抗拉强度

牛家永 周永毅 张建经 段达 陈克朋

牛家永, 周永毅, 张建经, 段达, 陈克朋. 基于新型拉伸装置的根-土复合体抗拉强度[J]. 西南交通大学学报, 2022, 57(1): 191-199. doi: 10.3969/j.issn.0258-2724.20200077
引用本文: 牛家永, 周永毅, 张建经, 段达, 陈克朋. 基于新型拉伸装置的根-土复合体抗拉强度[J]. 西南交通大学学报, 2022, 57(1): 191-199. doi: 10.3969/j.issn.0258-2724.20200077
NIU Jiayong, ZHOU Yongyi, ZHANG Jianjing, DUAN Da, CHEN Kepeng. Tensile Strength of Root and Soil Composite Based on New Tensile Apparatus[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 191-199. doi: 10.3969/j.issn.0258-2724.20200077
Citation: NIU Jiayong, ZHOU Yongyi, ZHANG Jianjing, DUAN Da, CHEN Kepeng. Tensile Strength of Root and Soil Composite Based on New Tensile Apparatus[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 191-199. doi: 10.3969/j.issn.0258-2724.20200077

基于新型拉伸装置的根-土复合体抗拉强度

doi: 10.3969/j.issn.0258-2724.20200077
基金项目: 国家重点研发计划(2017YFC0504901)
详细信息
    作者简介:

    牛家永(1992—),男,博士研究生,研究方向为生态岩土工程和岩土工程抗震,E-mail:niujiayong1229@my.swjtu.edu.cn

    通讯作者:

    张建经(1960—),男,教授,博士生导师,研究方向为生态岩土工程和岩土工程抗震,E-mail:jianzhang1102@swjtu.edu.cn

  • 中图分类号: TU41

Tensile Strength of Root and Soil Composite Based on New Tensile Apparatus

  • 摘要:

    为了研究植物根系在阻止边坡土体开裂中的作用机理,通过自主研制的一套单轴拉伸试验装置(由加载模块、数字控制模块、数据采集模块、制样模具4部分组成,可准确地获取测试材料的全过程位移-拉应力关系曲线和抗拉强度)定量地研究根系对土体抗拉强度的增强作用. 使用所研制的拉伸装置开展了不同含根量下灌木植物胡枝子根-土复合体的直接拉伸试验,分析根-土复合体的拉伸破坏机理,试验结果表明:素土的位移-拉应力曲线表现为单峰型,而根-土复合体的曲线表现为双峰型;随着含根量的增加,根-土复合体的抗拉强度呈非线性增大特征,相较于素土增加28.01%~142.15%;根-土复合体的抗拉强度可用本文提出的计算模型进行估算,当含根量为1~3根时平均误差为12.12%. 胡枝子根-土复合体的拉伸破坏过程可以分为4个阶段:应力增加阶段、土体破坏阶段、应力再增加阶段和根系滑移阶段,且根系主要在第一阶段和第三阶段起到贡献作用.

     

  • 图 1  制样模具

    Figure 1.  Sample preparation mold

    图 2  单轴拉伸试验装置

    Figure 2.  Uniaxial tensile test device

    图 3  胡枝子生长情况

    Figure 3.  Growing status of Lespedeza bicolor

    图 4  根系试样

    Figure 4.  Root sample

    图 5  根-土复合体制备过程

    Figure 5.  Preparation process of root-soil complex

    图 6  根-土复合体位移-拉应力关系

    Figure 6.  Relationship between displacement and tensile stress of root-soil composite systems

    图 7  第一峰值和第二峰值随含根量变化曲线

    Figure 7.  Variation curves of the first peak and the second peak with root content

    图 8  抗拉强度增量计算值与试验值对比

    Figure 8.  Comparison between calculated value and test value of tensile strength increment

    图 9  根-土复合体位移-拉应力典型关系曲线

    Figure 9.  Typical relationship of displacement and tensile stress of root-soil composite system

    图 10  素土和根-土复合体的破坏形态

    Figure 10.  Failure modes of plain soil and root soil composite system

    图 11  国道318德格—甘孜段浅层滑坡

    Figure 11.  Shallow landslide in Dege—Ganzi section of National Highway 318

    表  1  试验用土体的物理力学参数

    Table  1.   Physical and mechanical parameters of test soil

    参数密度/(g•cm−3天然含水率/%液限/%塑限/%黏聚力/kPa内摩擦角/(°)土质类型
    数值1.6524.6835.718.26.2519.78黏土
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-03-15
  • 修回日期:  2020-09-03
  • 网络出版日期:  2020-09-15
  • 刊出日期:  2020-09-15

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