Fuyu Wang , Huimei Zhang , Jiafan Zhang , Xiangrui Qin , Chao Yuan , Gaoyang Li
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引用次数: 0
Abstract
It is challenging to control the concealability and roughness of the fracture grouting process in a water-rich environment, which makes it difficult to directly observe the grout diffusion and deposition process as well as evaluate the sealing effect. Consequently, the water-blocking mechanism remains unclear. To address this issue, this paper utilized 3D printing technology to create a transparent rough fracture model based on the random midpoint displacement method and fractal theory. Additionally, an independent water grouting test system was developed to perform dynamic water grouting tests under various working conditions. The computational fluid dynamics and two-phase flow approach (CFD-TFM) is employed for numerical simulation to ascertain the slurry diffusion patterns and deposition effects at various time intervals throughout the grouting operation. Uniaxial compression and direct shear tests were conducted to evaluate the mechanical behavior of the grout-consolidated specimens. The results indicate that the rough fracture produced by the 3D printing process exhibits effective visibility, allowing for the observable trend of grouting flow. The experimental phenomena categorize the distribution pattern of dynamic water grouting into three types: cross-section water plugging pattern, comet type, and elongated streamline type. The slurry flow trend and particle deposition effect described by the CFD-TFM method are consistent with experimental observations, and all three forms—cross-section type, comet type, and slender streamline—are evident. The concrete results indicate that the particle deposition effect follows the order: cross-section type > comet type > slender streamline. Pressure monitoring data reveal a decreasing trend from the moving water inlet to the outlet boundary. As the distance from the grouting hole increases, the drop in sensor pressure values becomes less pronounced, resulting in reduced grouting deposition. These research findings provide a theoretical basis for the design of grouting reinforcement engineering.
期刊介绍:
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.