Abstract
This study focuses on analytical solutions of the fracture grouting pressure. Based on the cavity expansion and fracture grouting mechanism, the small deformation in the elastic zone, large deformation in the plastic zone, and non-associated flow rules are assumed. The solutions of the fracture grouting pressure based on the Unified Strength failure criterion, spatial mobilized plane criterion, Mohr–Coulomb failure criterion, and modified Cambridge model (MMC) are proposed for the large-deformation and small-deformation assumptions, respectively. A parameter analysis was conducted to analyze the differences between large-deformation and small-deformation theories. A comparison of the local test data with theoretical results reveals that the Cambridge model is more suitable for weakly consolidated soil and that the Mohr–Coulomb theory is suitable for over-consolidated soil. For all yield criteria in the study, the analysis indicates that the large-deformation theory has more reliable results than the small-deformation theory. The results in this study can direct the design and operation of fracture grouting.
Highlights
Fracture grouting has been widely used in traffic and civil engineering fields
Brantberger et al.[1] derived the solution of the grouting pressure in the control of the grout diffusion range and vertical uplift based on field data and the Grouting Intensity Number (GIN) criterion
The main objective of this study is to introduce the results for the fracture grouting pressure in the undrained condition based on the cavity expansion model
Summary
Fracture grouting has been widely used in traffic and civil engineering fields. It is applied to projects such as the treatment of subgrade landslide of highways and reinforcement of pile foundations. Most studies on the mechanism of fracture grouting and fracture grouting pressures focused on cracked rock masses. Few studies were related to the mechanism of fracture grouting and calculation of the fracture grouting pressure. Brantberger et al.[1] derived the solution of the grouting pressure in the control of the grout diffusion range and vertical uplift based on field data and the Grouting Intensity Number (GIN) criterion. Weaver[2] elaborated on the method to determine the grouting pressure based on the grouting log and hydrological data. Zhao et al.[4] obtained the relationship between grouting pressure and radial stress by comparing field-measured data with numerical simulation results. Zou and Li6 developed the cavity expansion problem by considering hydraulic–mechanical coupling and proposed an improved numerical method and stepwise procedure to obtain the theoretical solution.
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