Analysis of Blocking Slurry Diffusion Parameters for a New Self-Starting Drainage Anchor Cable

Abstract

A new self-starting drainage anchor that combines prestressed anchor cables with self-starting drainage is proposed. The novelty of the self-starting drainage method is the realization of the drainage and anchoring in the one inclined borehole. Reduction in the number of boreholes can greatly decrease the construction cost and duration of the project. The adverse effect of drilling construction disturbance on the slope is reduced. To tackle the possible blockage of the drainage cavity due to slurry leakage during the solidification process after finishing grouting in the blocking section. To this end, a theoretical equation for the slurry diffusion radius under slurry self-weight pressure boundary conditions is deduced. The result is verified for precision through comparison with numerical simulation. The findings reveal that the permeability coefficient of rock and soil mass has the most significant impact on the slurry diffusion radius, succeeded by the length of the grouting blocking section, slurry initial setting time, and drilling inclination in descending order of influence. With the 5% mass ratio of a “711” type slurry quick-setting agent, the maximum slurry diffusion radius can be reduced from 0.925 to 0.449 m, a reduction of 0.476 m, which is comparatively more recommended.

Keywords

self-starting drainage anchor / slurry diffusion parameters / stop-grouting plug / landslides / blocking section grouting / slope drainage / engineering geology

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China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature