理论与试验研究

喷射秸秆加筋黄土的强度特性研究

  • 王铁行 ,
  • 赵翊豪 ,
  • 金鑫
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  • 1.西安建筑科技大学 土木工程学院,西安 710055;
    2.西安工业大学 建筑工程学院,西安 710021
王铁行(1968—),男,陕西西安人,博士,教授,主要从事黄土、冻土工程设计理论和方法等方面的教学与科研工作。E-mail: wangtx@xauat.edu.cn
金鑫(1988—),男,陕西西安人,博士,主要从事黄土工程和环境岩土等方面的研究工作。E-mail: jinx_geomech@163.com

收稿日期: 2023-09-19

  网络出版日期: 2024-07-15

基金资助

陕西省科技厅自然科学基础研究计划项目(2021JQ-644);陕西省教育厅科研计划项目(21JK0672,21JK0689)

Study on Strength Characteristics of Jet Straw Reinforced Loess

  • Wang Tiehang ,
  • Zhao Yihao ,
  • Jin Xin
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  • 1. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, P.R. China;
    2. College of Civil and Architecture Engineering, Xi'an Technological University, Xi'an 710021, P.R. China

Received date: 2023-09-19

  Online published: 2024-07-15

摘要

纤维加筋能够改善土体的强度特性,但多适用于便于击实工况,在难于击实复杂工况方面的应用受限。本研究利用高压空气喷射制备秸秆加筋黄土试样,依托直剪试验探究纤维掺量及含水率的变化对加筋黄土强度的影响,获得加筋土在所需工况下的最优工作性能,并利用试验数据建立不同工况下加筋土体的强度预测模型。结果表明:(1)土体抗剪强度随纤维掺量的增加呈现“先升后降”趋势,纤维的加入能够改善土体的破坏模式,增强土体的残余强度及变形能力;(2)含水率变化对加筋土体黏聚力的影响显著,对高纤维掺量加筋土体内摩擦角的影响较大,但在高含水率下加筋土体仍能保持较好的抗剪强度:(3)含水率降低利于发挥纤维对黏聚力及内摩擦角的增强作用,纤维对土体强度的提升率随含水率降低呈现“先降后缓”的趋势;(4)纤维掺量及含水率为抗剪强度重要影响因素,强度预测时应优先考虑含水率的影响。本研究成果对于优化加筋黄土性能、克服纤维加筋土在工程中的应用盲区具有指导意义。

本文引用格式

王铁行 , 赵翊豪 , 金鑫 . 喷射秸秆加筋黄土的强度特性研究[J]. 地下空间与工程学报, 2024 , 20(3) : 800 -811 . DOI: 10.20174/j.JUSE.2024.03.10

Abstract

Adding fiber into soil can enhance the strength characteristics of soil, but it is mostly suitable for easy compaction conditions, and its application of complex conditions is limited. In this paper, preparation of jet straw reinforced loess samples by high pressure air injection, and direct shear tests were carried out to study the influence of fiber content and water content changes on the strength of the reinforced loess. In order to obtain the best mix ratio of reinforced soil under the required working performance,and based on the experimental data, the strength prediction model of reinforced soil under different working conditions is established.The results showed that: (1) The strength of soil presents a trend of "first increasing and then decreasing" to the increase of the content in straw fibe,and the addition of fiber can improve the failure mode of soil and enhance the residual strength and deformation capacity of soil;(2)The change of water content has a significant impact on the cohesion of the soil, but internal friction angle of reinforced soil with high fiber content is greatly affected, but the reinforced soil can still maintain good shear strength under high water content; (3)The decrease of water content is conducive to the reinforcement of fiber on cohesion and internal friction angle,with the decrease of water content, fiber increases soil strength lifting rate showed a trend of "decreasing first and then slowing down"; (4)The fiber content and water content are important factors affecting the shear strength, and the influence of water content should be given priority when predicting the strength; The research results have guided significance of optimizing the performance of reinforced loess, overcoming the blind area of application of fiber reinforced soil in engineering and scientific selection of corresponding design and construction methods.

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