Journal
PROCESSES
Volume 10, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/pr10020256
Keywords
sand layer; grouting-reinforced body; seepage; damage model
Categories
Funding
- National Natural Science Foundation of China [52109131]
- Natural Science Foundation of Shandong Province [ZR2020QE290]
- National Natural Science Foundation of China Joint Fund [U1706223]
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This paper investigates the performance degradation law of grouting-reinforced body under seepage and establishes a damage mechanics model. Experimental studies are carried out to examine the influence of permeation water pressure on the permeability and damage variables of the grouting-reinforced body. The research findings show that seepage has a significant impact on the damage of grouting-reinforced body and a quantitative relationship between permeation pressure, time, and damage variables is obtained.
Grouting is a reinforcing method commonly used in underground engineering. The grouting-reinforced body is in saturated groundwater, which is due to long-term seepage, resulting in reinforcing performance attenuation. This is a guarantee for the safe operation of the underground structure's long life cycle that obtains the performance attenuation law of the grouting-reinforced body under the action of seepage. This paper uses primitive to describe the mechanical properties of grouting-reinforced body under seepage erosion, establishing the damage mechanics model of grouting-reinforced body under seepage, designing deterioration experimental of grouting-reinforced body under seepage, studying the mechanism of the permeation water pressure on the permeability of the grouting-reinforced body, and obtaining the variable of the grouting-reinforced body damage variable with the permeation water pressure. Studies have shown that seepage effects have a sudden jump phenomenon in the process of grouting-reinforced body erosion, and the limit damage of grouting-reinforced body is 0.15~0.19. The relationship between the permeability and damage variables of grouting-reinforced body under seepage are verified, and the quantitative relationship of grouting-reinforced body between permeation pressure, time and damage variables are obtained. This research is of great importance for improving the deterioration theory under seepage and ensuring the long-term safety of tunnel operations.
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