Research on Movement Pattern of Synchronous Grouting in Special-shaped Shield using Smoothed Partide Hydrodynamics Simulation and Test Verification

Abstract:

In this paper, the overall filling law and local diffusion model in specialshaped shield is numerically simulated using the smoothed particle hydrodynamics (SPH) method, and then the grouting movement mechanism of grout particles are analyzed. Following, the results from the numerical simulation and visual large model test were compared to verify the analysis rationality, some organic glass materials and photographic instruments are introduced to illustrate real filling process of grouting in the specialshaped space. The results show that the grout diffusion model has a squeezing filling flow characteristics associated with the longitudinal toroidal correlation. The grouting diffusion surface is relatively uniform at the shield tail top and shoulder, and there is an obvious rising pathway in the side of shield tail waist, and the grout is badly squeezing and silting at the bottom outlet of shield tail.

Key words:special-shaped shield; synchronous grouting; movement pattern; smoothed particle hydrodynamics (SPH) simulation; test verification