This study presents the imbibition characteristics of mudstone extracting water from cement grout. The pore-size distribution characteristics of the weak-cemented mudstone were obtained by some pore characteristic tests. The water distribution and migration of mudstone during imbibition with cement grout of different water-cement (W-C) ratios were tested by nuclear magnetic resonance (NMR), and surface deformation and water (from the cement grout) migration velocity (migration state) for mudstone samples with different initial water content were tested by digital photographic measurement (DPM) tests. The results showed that each T₂ spectrum presented an isolated bimodal feature, and the left peak area was much larger than that of the right, indicating that the mudstone is mostly microporous, which confirms the pore characteristics of the mudstone obtained by scanning electron microscope, mercury intrusion porosimetry, and nitrogen adsorption desorption. The average slopes of the curves (signal amplitude and total area of the peak) increased with the increasing W-C ratios of grout, but the W-C ratio of 1 was a critical value for the imbibition capacity of mudstone extracting water from the cement grout. The deformation ranges of mudstone samples were very consistent with the ranges of spontaneous imbibition, and the deformation of the mudstone samples increased with the increasing imbibition time; the values of grout viscosities after the imbibition were all bigger than those of original cement grout. Moreover, the water migration velocities showed a trend of increasing and decreasing with the increase of W-C ratios of grout and the initial water content of mudstone samples at the same imbibition time.

中文翻译：

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从水泥浆中提取水的泥岩自吸特性试验研究

这项研究提出了从水泥浆中提取水的泥岩的吸水特性。通过一些孔隙特征试验获得了弱胶结泥岩的孔隙分布特征。通过核磁共振（NMR）测试了不同水灰比（WC）比的水泥浆在吸收过程中泥岩的水分布和迁移，以及泥岩的表面变形和水（来自水泥浆）的迁移速度（迁移状态）。通过数字照相测量（DPM）测试来测试具有不同初始水分含量的样品。结果表明，每个T ₂谱呈现孤立的双峰特征，左峰面积比右峰大得多，表明该泥岩多为微孔，这证实了通过扫描电子显微镜，压汞法和氮吸附法获得的泥岩的孔隙特征。解吸。曲线的平均斜率（信号振幅和峰的总面积）随着灌浆WC比率的增加而增加，但是WC比率1是从水泥灌浆中提取水的泥岩吸收能力的临界值。泥岩样品的变形范围与自吸的范围非常吻合，随着吸水时间的增加，泥岩样品的变形也随之增加。吸水后的灌浆粘度值均大于原始水泥灌浆。此外，在相同的吸水时间，水的迁移速度呈现出随灌浆WC比的增加和泥岩样品初始含水量的增加而减小的趋势。