Liu Y, Wu Z, Weng L, Wu L, Xu X, Liu Q. (2023) Experimental Study on the Grouting Diffusion Process in Fractured Sandstone with Flowing Water Based on the Low-Field Nuclear Magnetic Resonance Technique. Rock Mechanics and Rock Engineering.

论文主要内容包括：

(1) 为了研究裂隙砂岩中流动水的动态注浆扩散过程，研制了一种基于LF-NMR的动态注浆试验系统;

(2)  对比了超细水玻璃水泥浆与自由水的核磁共振特性，系统研究了水流速度、浆液流速、裂隙孔径对裂隙砂岩渗流注浆扩散特性的影响;

(3) 浆液流速和裂隙孔径的增大可有效提高动水注浆效率，而水流流速的增大会降低动水注浆效率;

(4) 当浆液流速低于水流流速时，动水注浆试验无法成功进行;

(5) 当浆液流速与水流速相同时，孔隙充浆率达到峰值;

(6) 研究结果可为注浆工程实践中注浆参数的选择提供有意义的参考和指。

Fig. 1 Schematic diagram of the dynamic water grouting test system for fractured rock.

Fig. 2 (a) Evolution of the T₂ curves in the fractured sandstone during the dynamic water grouting process; (b) MRI of the fractured sandstone filled with flowing water before grouting; (c) MRI of the fractured sandstone after grouting (V_g =12 ml/min, V_w = 6 ml/min, d = 1.0 mm).

Fig. 3 Variations in the slurry filling ratio with the grouting time at different water flow velocities: (a) V_w = 6 ml/min; (b) V_w = 12 ml/min; (c) V_w = 18 ml/min.

（论文被“矿山水文地质与工程地质”公众号推荐：https://mp.weixin.qq.com/s/P5fz_G6TUgCuStmEvNckBw）