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Experimental Investigation on the Grouting Diffusion Characteristics and Relative Filling Degree of Chemical Slurry in Fractured Porous Sandstone

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Abstract

In this study, several chemical grouting tests of fractured porous sandstone were performed based on the low-field nuclear magnetic resonance (NMR) technology, and the nuclear magnetic signal characteristics (NMR T2) of slurry were tracked and tested in real-time. The variations in the injected slurry volume, effective grouting time and slurry permeability with different confining pressures, injection pressures and fracture inclination angles were quantitatively analysed. Besides, the relative filling degree (RFD) was proposed to comprehensively investigate the diffusion processes under different grouting conditions. The results indicate that both the high confining pressure (e.g., 20 MPa) and large fracture inclination angle (e.g., 27°) induce the decrease in injected slurry volume by the rate of 16.7 and 44%, while the effects induced by injection pressure is not obvious. The permeability of slurry in fractured porous sandstone linearly decrease as the confining pressure and fracture inclination angle increase, coinciding with the decrease amplitude of 67.1 and 44%, respectively. The slurry diffusion pattern in fractured porous sandstone is strongly dependent on the confining pressure, injection pressure and fracture inclination angle. Both the relative filling degrees of rock pores and fractures decrease with increasing confining pressure and fracture inclination angle.

Highlights

  • The diffusion processes of chemical slurry under several external conditions and grouting parameters have been monitored in real-time by the low-field NMR technique.

  • The variations in the injected slurry volume and diffusion patterns with different grouting conditions were comprehensively studied.

  • The expression of the relative filling degree of slurry in fractured porous sandstone was proposed. And the effects of various grouting conditions on the relative filling degree were analyzed based on the evolution of NMR T2 curves.

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Data Availability

The data that support the findings of this study can be available from the corresponding author upon reasonable request.

Abbreviations

T 2 :

The total transverse relaxation time

T S :

The surface relaxation time

T D :

The diffusion relaxation time

T B :

The bulk relaxation time

k eff :

The growth rate of effective grouting section

k w :

The growth rate of overall grouting section

n sta :

The increased slurry volume in the stable stage

n eff :

The increased slurry volume in the effective grouting stage

t eff :

The start time of the effective grouting stage

t sta :

The duration of the whole grouting stage

RFD t :

Relative filling degree at different grouting time

S :

The peak area of NMR T2 curve under different external and grouting conditions at different grouting time

t :

The grouting time

i :

The peak number, i = 1, 2

j :

The various grouting conditions (confining pressure, injection pressure and fracture inclination angle)

S max :

The maximum peak area under different grouting conditions when the grouting tests were completed

K ab :

The intrinsic permeability coefficient

K ab f :

The intrinsic permeability coefficient of fracture

K ab p :

The intrinsic permeability coefficient of pores

Q :

The injected slurry volume

μ :

The slurry viscosity

ΔP :

The grouting pressure

L :

The length of the specimen

A :

The cross sectional area of the specimen

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Acknowledgements

The research work is supported by the National Natural Science Foundation of China (Grant Nos. 51974289 and U22A20234).

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Authors

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YZ Conceptualization, Methodology, Investigation, Data Curation, Writing. BL Data Curation, Resources, Funding acquisition. ZW Conceptualization, Writing-Review& Editing. YJ Validation, Writing-Review& Editing. QL Supervision. ML Validation, Writing-Review& Editing. LW Methodology.

Corresponding author

Correspondence to Bin Liu.

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Zhou, Y., Liu, B., Wu, Z. et al. Experimental Investigation on the Grouting Diffusion Characteristics and Relative Filling Degree of Chemical Slurry in Fractured Porous Sandstone. Rock Mech Rock Eng 56, 7819–7837 (2023). https://doi.org/10.1007/s00603-023-03463-4

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  • DOI: https://doi.org/10.1007/s00603-023-03463-4

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