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Grouting diffusion characteristics in rough sandstone fracture with flowing water: Insights from NMR experimental investigation
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-08 , DOI: 10.1016/j.tust.2025.106372
Yang Liu, Zhijun Wu, Lei Weng, Longji Wu, Yuan Zhou, Quansheng Liu

Observation of dynamic water grouting diffusion characteristics presents formidable challenges owing to the concealed and intricate nature of rock formations in underground engineering. Therefore, investigating the grouting diffusion characteristics in rough fracture with flowing water is crucial for preventing water inrush and reinforcing fractured rock masses. This study conducted a series of dynamic water grouting tests encompassing varying grouting parameters, and the grouting diffusion processes were monitored utilizing the nuclear magnetic resonance (NMR) technique. The initial setting time and hydration process of ultrafine cement-sodium silicate (UC-S) grout was first investigated. The effects of water flow rate, grout flow rate, fracture aperture, and fracture roughness on the grouting diffusion process and effectiveness were comprehensively investigated. Then, the effects of varying grouting parameters on the dynamic water grouting effectiveness were evaluated using the global sensitivity analysis method. The results indicated that the fracture roughness notably affects the grouting effectiveness, with a more pronounced effect evident when water flow rate exceeds grout flow rate. In scenarios where water flow rate exceeds grout flow rate, the increase of fracture roughness can extend the total effective grouting time and simultaneously enhance grout diffusion distance under counter-current conditions. Notably, favorable grouting effectiveness can be achieved when the Joint Roughness Coefficient (JRC) exceeds 6. The grout flow rate and water flow rate are the main influential factors on grouting effectiveness, followed by fracture roughness and fracture aperture. The findings of this study can provide valuable reference and guidance for the grouting parameter selection in grouting engineering applications.

中文翻译:


流水粗砂岩裂缝中的注浆扩散特性——来自 NMR 实验研究的见解



由于地下工程中岩层的隐蔽性和复杂性,观察动态注浆扩散特性提出了艰巨的挑战。因此,研究流水粗碎裂隙中的注浆扩散特性对于防止突水和加固裂隙岩体至关重要。本研究进行了一系列动态注浆测试,包括不同的注浆参数,并利用核磁共振 (NMR) 技术监测注浆扩散过程。首先研究了超细水泥-硅酸钠 (UC-S) 灌浆料的初始凝结时间和水化过程。综合研究了水流速、灌浆流速、裂缝孔径和裂缝粗糙度对注浆扩散过程和效果的影响。然后,采用全局敏感性分析方法评价不同注浆参数对动态注浆效果的影响。结果表明,裂缝粗糙度对注浆效果有显著影响,当水流速超过灌浆流速时,影响更为明显。在水流速超过浆液流速的情况下,裂缝粗糙度的增加可以延长总有效注浆时间,同时提高逆流条件下浆液扩散距离。值得注意的是,当节理粗糙度系数 (JRC) 超过 6 时,可以获得良好的灌浆效果。浆液流速和水流速是影响注浆效果的主要因素,其次是裂缝粗糙度和裂缝孔径。 研究结果可为注浆工程应用中的注浆参数选择提供有价值的参考和指导。
更新日期:2025-01-08
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