Grouting mechanism of quick-setting slurry in fracture with random fracture opening considering time–space characteristics of viscosity

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Shu Zhu, Jianfu Shao, Hexuan Zhu, Zhende Zhu, Feiyang Wang, Junyu Wu
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Abstract

The coupling effect between the spatial variability of slurry diffusion and the time-varying viscosity of quick-setting slurry is the time–space characteristics of slurry viscosity (TSCSV). The TSCSV is the governing factor for the complex and uncontrollable flow of slurry in fractures. In this regard, the flow pattern of quick-setting slurry is considered as a Bingham fluid with viscosity spatiotemporal characteristics. Using the fractal function with random parameters (W-M function), a single fracture with random fracture opening (RFO) is drawn, and a theoretical model on grouting diffusion in fractures is established considering the TSCSV. The RFO is corrected for head loss, and the spatiotemporal distribution equation of the RFO grouting pressure is derived. The relationship between grouting pressure, grouting time, and slurry diffusion distance is obtained. Additionally, the effects of the RFO, the fractal dimension of the fracture curve, the horizontal movement distance of the lower end face of the fracture, and the effects of viscosity and grouting rate on the viscosity and grouting pressure in the slurry diffusion space are discussed. Finally, by predefining the spatial distribution function of slurry viscosity for a single fracture in the numerical calculation model, a numerical simulation of random fracture distribution grouting considering viscosity spatiotemporal characteristics is achieved. The rationality of the model is validated through a comparison of theoretical analysis and numerical simulation, providing reference for the determination of grouting parameters in practical grouting projects.

Abstract Image

Abstract Image

考虑粘度时空特性的随机断裂口中速凝浆液的灌浆机理
泥浆扩散的空间变化与速凝泥浆粘度的时间变化之间的耦合效应就是泥浆粘度的时空特性(TSCSV)。TSCSV 是泥浆在裂缝中复杂而不可控流动的支配因素。在这方面,速凝泥浆的流动模式被视为具有粘度时空特征的宾汉流体。利用具有随机参数的分形函数(W-M 函数),绘制了具有随机裂缝开口(RFO)的单一裂缝,并建立了考虑 TSCSV 的裂缝灌浆扩散理论模型。对 RFO 进行水头损失校正,得出 RFO 灌浆压力的时空分布方程。得出了灌浆压力、灌浆时间和浆液扩散距离之间的关系。此外,还讨论了 RFO、裂缝曲线分形维度、裂缝下端面水平移动距离以及粘度和注浆率对浆液扩散空间中粘度和注浆压力的影响。最后,通过在数值计算模型中预先定义单个裂缝的浆液粘度空间分布函数,实现了考虑粘度时空特征的随机裂缝分布灌浆数值模拟。通过理论分析与数值模拟的对比,验证了模型的合理性,为实际灌浆工程中灌浆参数的确定提供了参考。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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