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Equivalent elastic model of splitting grouting reinforcement in weak strata
Quanwei Liu1, Jia Deng2, Linsheng Liu1
1Qingdao Metro Line 6 Co Ltd, Qingdao, 266427, Shandong, China.
Scientific Reports
|April 2, 2025
Summary
This study develops a method to calculate the grouting reinforcement effect in weak strata. Increasing grout injection rate significantly improves the mechanical properties of reinforced soil.
Area of Science:
- Geotechnical Engineering
- Civil Engineering
- Materials Science
Background:
- Quantitative calculation of grouting reinforcement is crucial for scientific design in weak strata.
- Understanding grout vein-soil interaction is essential for effective reinforcement.
Purpose of the Study:
- To establish a calculation method for the equivalent elastic parameters of pregrouted reinforcement bodies.
- To analyze the influence of construction parameters on these parameters.
Main Methods:
- Developing an equivalent transversely isotropic model using homogenization.
- Applying deformation compatibility and constitutive equations for parameter calculation.
- Analyzing the impact of grouting hole density, injection rate, and modulus ratio.
Main Results:
- Grouting hole density has minimal impact on the equivalent elastic modulus.
- Increased grout injection rate enhances equivalent elastic modulus and Poisson's ratio.
- The grout-to-soil elastic modulus ratio significantly affects parameters when below 0.2.
Conclusions:
- The proposed calculation method accurately predicts equivalent elastic parameters.
- Grouting parameters, particularly injection rate, can be optimized for improved reinforcement.
- The findings are validated by a case study on Qingdao Metro Line 13.
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