长江科学院院报 ›› 2022, Vol. 39 ›› Issue (12): 154-160.DOI: 10.11988/ckyyb.20221018

• 施工技术及管理 • 上一篇    下一篇

基于离散元模拟的黏土劈裂注浆扩散特性

张泽甫1, 成远登2, 丁文云3, 陈培1, 张永明1, 念培红4, 刘海明2   

  1. 1.云南省滇中引水工程建设管理局,昆明 650051;
    2.昆明理工大学 建筑工程学院,昆明 650500;
    3.中铁二院昆明勘察设计研究院有限责任公司,昆明 650500;
    4.保(山)施(甸)高速公路投资开发责任公司,云南 保山 678200
  • 收稿日期:2022-08-13 修回日期:2022-09-27 出版日期:2022-12-01 发布日期:2023-01-04
  • 通讯作者: 陈 培(1981-),男,河南洛阳人,高级工程师,主要从事水利水电工程管理工作。E-mail:16779335@qq.com
  • 作者简介:张泽甫(1981-),男,云南昆明人,高级工程师,主要从事水利水电工程建设管理工作。E-mail:36463532@qq.com
  • 基金资助:
    云南省重大科技专项计划(202102AF080001-2,202002AF080003);云南省应用基础研究计划项目(202001AT070083);云交科教[2018]20号

Diffusion Characteristics of Clay Splitting Grouting Based on Discrete Element Simulation

ZHANG Ze-fu1, CHENG Yuan-deng2, DING Wen-yun3, CHEN Pei1, ZHANG Yong-ming1, NIAN Pei-hong4, LIU Hai-ming2   

  1. 1. Administration Bureau of Central Yunnan Water Diversion Project, Kunming 650051, China;
    2. Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China;
    3. Kunming Survey,Design and Research Institute Co., Ltd. of CREEC,Kunming 650500,China;
    4. Investment and Development Corporation for Baoshan-Shidian Expressway, Baoshan 678200, China
  • Received:2022-08-13 Revised:2022-09-27 Online:2022-12-01 Published:2023-01-04

摘要: 为从细观角度研究劈裂注浆对富含黏土隧洞的加固效果,依托滇中引水工程伍庄村隧洞进口段,采用离散元软件PFC2D,基于离散元流固耦合理论、平板窄缝流动模型与Fish语言的二次开发,实现了注浆过程中浆液和土体颗粒的相互作用,建立了颗粒流劈裂注浆数值模型。研究了注浆时步、注浆压力、颗粒粒径比及黏结强度对浆液扩散半径及土体孔隙率的影响。结果表明:注浆压力是影响土体加固效果的主控因素,随着注浆压力的增大,浆液扩散半径不断扩大,孔隙率持续增加,与注浆孔距离越远,对孔隙率影响越小,存在最优注浆压力。土体细观参数对注浆后宏观力学特性有较为明显的影响,随颗粒粒径比和黏结强度的增大,浆液扩散半径及孔隙率明显减小。将数值模拟结果与室内模型试验结果对比,发现二者趋势吻合较好,与实际相符,验证了所建立的注浆数值模型的正确性。

关键词: 黏土, 劈裂注浆, 离散元模拟, 流固耦合, 模型试验, 扩散特性, 滇中引水工程

Abstract: The aim of this study is to probe into the reinforcement effect of splitting grouting on clay-rich tunnels from a mesoscopic viewpoint. The entrance segment of Wuzhuangcun tunnel of the Central Yunnan Water Diversion Project is taken as a research background. The PFC2D model of splitting grouting is established by simulating the interaction between slurry and soil particles in the process of grouting based on the discrete element fluid-solid coupling theory, the plate narrow slit model and the secondary development of Fish language. The influences of grouting time step, grouting pressure, particle size ratio and cohesive strength on the slurry diffusion radius and soil porosity are studied. Results reveal that grouting pressure is the dominant control factor affecting the soil reinforcement effect. With the increase of grouting pressure, the slurry diffusion radius expands continuously and the porosity increases continuously. A smaller distance from the grouting hole results in a smaller influence on porosity. An optimal grouting pressure exists. Moreover, mesoscopic soil parameters have obvious influence on the macroscopic mechanical properties after grouting. With the increase of particle size ratio and cohesive strength, the slurry diffusion radius and porosity reduce significantly. The simulation results are in well agreement with indoor model test result, which verified the correctness of the simulated model.

Key words: clay, splitting grouting, discrete element simulation, fluid-soild coupling, model test, diffusion rule, Central Yunnan Water Diversion Project

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