摘要
岩体中存在大量倾斜裂隙,在受到外力作用时容易发生滑移、坍塌等危害,对工程结构的安全性和稳定性构成了严重威胁。基于自主研制的水泥基磁性浆液材料,通过开展扫描电子显微镜(SEM)、X射线衍射(XRD)和抗压强度试验等,从微观角度分析了水性环氧树脂对磁性浆液强度的影响机制,分析了梯度磁场下不同区域的磁感应强度变化和磁颗粒成链演化过程,揭示了磁场强度下浆液粘度骤变的内在影响机制。系统研究了磁场作用下磁性浆液在裂隙中的注浆扩散,建立了磁性浆液磁注浆扩散模型。结果表明:(1)浆液动力粘度随磁感应强度的增加呈指数型函数上升,当磁场强度达到1 000 Gs时,浆液粘度相较于初始动力粘度提高了17.26倍;(2)在磁场作用下磁颗粒间相互作用形成链式结构,随磁场强度增大,磁力链长度和浆液粘度均显著增加;(3)磁场强度的提升有助于增大磁性浆液的扩散面积,当磁场强度由6 000 Gs增加到12 000 Gs时,浆液扩散面积增长48.87%。将扩散模型理论值与试验值进行对比,二者间误差值均较小。该研究成果对完善磁性浆液理论与应用具有一定参考价值。
There are a large number of inclined fractures in the rock mass,which may be prone to hazards such as slipping and collapsing when subjected to external forces,posing a serious threat to the safety and stability of engineering structures.Based on self-developed cement-based magnetic slurry materials,through scanning electron microscope(SEM),X-ray diffraction(XRD)and compressive strength tests,the influence mechanism of waterborne epoxy resin on the strength of magnetic liquid from a microscopic perspective was analyzed,the changes in magnetic induction intensity at different regions under the gradient magnetic field were analyzed,and the evolution process of magnetic particle chaining was investigated.The internal influencing mechanism of the sudden change in slurry viscosity under the magnetic field intensity was revealed.Using the self-developed variable inclination fissure visualization grouting test device,systematically studied the grouting diffusion law of magnetic slurry in fissures with different inclinations under the action of magnetic field,and established a magnetic slurry grouting diffusion model that takes into account the action of magnetic field and the relationship between the viscosity of the slurry and the change of magnetic induction strength.The results show that:(1)the dynamic viscosity of the slurry increases exponentially with the increase of the magnetic induction intensity.When the magnetic field intensity reaches 1000 Gs,the slurry viscosity increases by 17.26 times compared with the initial dynamic viscosity.(2)Under the action of the magnetic field,the magnetic particles interact with each other to form a chain structure.The greater the magnetic field intensity,the more significantly the length of the magnetic force chain and the higher slurry viscosity.(3)When the magnetic field intensity increases from 6000 Gs to 12000 Gs,the diffusion area of the slurry increases by 48.87%,indicating that the increase of the magnetic field intensity helps to enhance the diffusion area of the magnetic slurry.The error values between theoretical values of the diffusion model and the experimental values are all relatively small.These findings have certain reference value for perfecting the theory and application of magnetic slurry.
作者
黎照
鲍晓鹏
刘杰
李政
杨渝南
乔志存
LI Zhao;BAO Xiaopeng;LIU Jie;LI Zheng;YANG Yunan;QIAO Zhicun(College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,Hubei,China;College of Architecture and Design,Xinyu University,Xinyu 338000,Jiangxi,China;Hydrogeology and Engineering Geology Brigade,Hubei Geological Bureau,Jingzhou 434020,Hubei,China)
出处
《材料导报》
北大核心
2025年第20期79-87,共9页
Materials Reports
基金
国家自然科学基金(52079071)
三峡库区地质灾害教育部重点实验室(2020KDZ08)
湖北巴东地质灾害国家野外科学观测研究站开放基金(BNORSG202313)。
关键词
倾角裂隙
磁性浆液
磁场强度
粘度瞬变
磁注浆模型
inclined fissure
magnetic slurry
magnetic field strength
viscosity transient
magnetic grouting modeling
