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Effect of Particle Size Distribution on the Grout Diffusion Pattern in Completely and Strongly Weathered Granite
Grouting has been widely adopted in disaster management related to tunneling. Since completely and strongly weathered granite is problematic stratum in tunneling construction, grouting simulation tests were carried out to investigate the grout diffusion pattern with various particle size distributions and grouting pressures. Injected grout mass and characteristics of the consolidating body were obtained to reveal the mechanism of the grouting process. Permeation, compaction, fracture, and their mixed diffusion pattern were defined, and the different diffusion patterns were distinguished by the particle size distribution and grouting pressure. The compaction pattern and the permeation pattern have the lowest and highest injected grout mass, respectively. Injected grout mass increased with the increment of grouting pressure. Particle size distribution and grouting pressure determine the grout diffusion pattern. The permeation-dominated pattern can be distinguished from compaction and fracture pattern by D10, while the compaction and fracture patterns are differentiated by D60. The grout diffusion pattern is determined by grouting pressure in the specific strata though it has no relationship with the groutability. Permeation pattern has the highest reinforcement effect with a “sandcrete” structure, the compaction pattern has the lowest reinforcement effect with compaction effect, and the fracture pattern enhances strata by compaction and skeleton support. Finally, a criterion was obtained to forecast the completely and strongly weathered granite’s grout diffusion pattern, which was confirmed by the grouting engineering.
Effect of Particle Size Distribution on the Grout Diffusion Pattern in Completely and Strongly Weathered Granite
Grouting has been widely adopted in disaster management related to tunneling. Since completely and strongly weathered granite is problematic stratum in tunneling construction, grouting simulation tests were carried out to investigate the grout diffusion pattern with various particle size distributions and grouting pressures. Injected grout mass and characteristics of the consolidating body were obtained to reveal the mechanism of the grouting process. Permeation, compaction, fracture, and their mixed diffusion pattern were defined, and the different diffusion patterns were distinguished by the particle size distribution and grouting pressure. The compaction pattern and the permeation pattern have the lowest and highest injected grout mass, respectively. Injected grout mass increased with the increment of grouting pressure. Particle size distribution and grouting pressure determine the grout diffusion pattern. The permeation-dominated pattern can be distinguished from compaction and fracture pattern by D10, while the compaction and fracture patterns are differentiated by D60. The grout diffusion pattern is determined by grouting pressure in the specific strata though it has no relationship with the groutability. Permeation pattern has the highest reinforcement effect with a “sandcrete” structure, the compaction pattern has the lowest reinforcement effect with compaction effect, and the fracture pattern enhances strata by compaction and skeleton support. Finally, a criterion was obtained to forecast the completely and strongly weathered granite’s grout diffusion pattern, which was confirmed by the grouting engineering.
Effect of Particle Size Distribution on the Grout Diffusion Pattern in Completely and Strongly Weathered Granite
Indian Geotech J
Zhang, Jian (author) / Li, Shu-cai (author) / Li, Zhao-feng (author) / Yang, Lei (author) / Zhang, Qing-song (author) / Wang, Kai (author) / Qi, Yan-hai (author) / Du, Junqi (author) / Li, Heng-tian (author)
Indian Geotechnical Journal ; 50 ; 531-539
2020-08-01
9 pages
Article (Journal)
Electronic Resource
English
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