非线性压密效应下砂土劈裂注浆机理研究

秦鹏飞

doi:10.13204/j.gyjzG22072408

非线性压密效应下砂土劈裂注浆机理研究

doi: 10.13204/j.gyjzG22072408

秦鹏飞

黄河科技学院工学部, 郑州 451000

基金项目:

河南省高等学校重点科研项目（24A560011）；重庆交通大学水利水运工程教育部重点实验室开放基金资助项目（SLK2023B07）；河南省水利厅科技攻关项目（2023GG45）。

详细信息

作者简介:
秦鹏飞,男,1984年出生,博士,副教授。电子信箱:929163723@qq.com

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- 文章访问数: 55
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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-24
- 网络出版日期: 2024-02-28

Study on Splitting Grouting Mechanisms in Sand Based on Nonlinear Compaction Effect

QIN Pengfei

School of Architecture and Engineering, Huanghe University of Science and Technology, Zhengzhou 451000, China

摘要

摘要: 砂土中劈裂注浆是浆液与土体耦合作用的动态过程，浆液扩散具有隐蔽性、复杂性和随机性特征，劈裂注浆机理的研究目前仍亟待加强。通过侧限压缩试验对砂土的宏、微观结构特征、应力传递方式进行了探讨。结果发现：颗粒破碎度和黏粒含量是影响砂土压密效应的主要因素，颗粒破碎度与压密效应正相关，黏粒含量则与压密效应负相关。黏粒含量超过临界值后，砂土宏微观结构发生质变，非线性压密效应显著增强。基于二次函数模型对砂土非线性压密过程进行描述，模型采用砂土初始压缩模量E_t和终级荷载下的极限应变ε_u进行表征，物理概念清晰且参数易于测定。砂土压密效应对浆液扩散距离、劈裂宽度及浆液压力分布均有显著影响，考虑砂土自身压密特性的劈裂注浆分析方法，可进一步深化对砂土劈裂注浆机理的认知。
- 劈裂注浆 /
- 非线性压密特性 /
- "浆-土"耦合效应 /
- 应力传递 /
- 砂土加固
Abstract: The splitting grouting in sand is a dynamic coupling process between slurry and soil. The slurry diffusion has the characteristics of invisibility, complexity and randomness. The research on the splitting grouting mechanism still needs to be strengthened at present. Through confined compression tests, the macro and micro structure characteristics and stress transfer modes of sand were explored. It was found that the particle fragmentation and clay particle content were the main factors inflerencing the compaction effect of sand, the particle fragmentation was positively correlated with the compaction effect, and the clay particle content was negatively correlated with the compaction effect. When the content of clay particles exceed the critical value, the macro and micro structure of sand would change qualitatively, and the nonlinear compaction effect was conspicuously enhanced. The nonlinear compaction process of sand was described based on a quadratic function model, which was characterized by the initial compression modulus E_t of sand and the ultimate strain ε_u under the final load, and the model was of a clear phyical concept and easliy measured parameters. The compaction effect of sand had a significant impact on slurry diffusion distance, splitting width and slurry pressure distribution. The splitting grouting analysis method considering the self-compaction characteristics of sand could further deepen the understanding of the mechanism for splitting grouting in sand.
- splitting grouting /
- nonlinear compaction characteristic /
- coupling effect of slurry and soil /
- stress transfer /
- sand reinforcement

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