迂曲度对盾构隧道管片注浆的影响

Effect of Tortuosity on the Grouting of Shield Tunnel Sheets

为了探究浆液扩散路径迂曲度对盾构隧道管片注浆效果的影响,以幂律浆液为对象,建立了考虑扩散路径迂曲度的盾构隧道管片注浆渗透扩散模型;分析了注浆时间、终止注浆压力和注浆速率对浆液扩散半径和管片所受压力的影响。最后,利用MATLAB与COMSOL Multiphysics软件,开发得到考虑扩散路径迂曲度的幂律浆液渗透扩散数值模拟程序,实现了盾构隧道管片注浆效果的可视化。研究结果表明:在其他参数不变时,终止注浆压力增大,则浆液扩散半径和管片所受压力均增大;随着注浆速率的不断增大,浆液扩散半径和管片所受压力先增大后减小。考虑浆液扩散路径迂曲度后,浆液扩散半径和浆液对管片的压力值较不考虑扩散路径迂曲度时减小,且随着终止注浆压力和注浆速率的增大,扩散路径迂曲度对扩散半径和管片所受压力的影响更加明显。

In order to study the effect of tortuosity of diffusion paths on the grouting effect of shield tunnel segment,a penetration diffusion model of grouting through segments of shield tunnel considering tortuosity of diffusion paths was established for power-law fluid.The influence of grouting time,grouting pressure and grouting rate on the diffusion radius and the tunnel segment were analyzed.Finally,by using MATLAB and COMSOL Multiphysics software,a numerical simulation program for permeation and diffusion of power-law fluid considering tortuosity of diffusion paths was developed,and the numerical simulations of grouting for shield tunnel segment was achieved.The research results show that under the condition of other parameters unchanged,as the termination grouting pressure increases,the diffusion radius and the pressure on the tunnel segment increase.With the increasing grouting rate,the diffusion radius and the pressure on the tunnel segment first increase and then decrease.After the consideration of tortuosity of diffusion paths,the diffusion radius and the pressure on the tunnel segment decrease compared with the case without considering tortuosity of diffusion paths.With the increase of the termination grouting pressure and grouting rate,the influence of tortuosity of diffusion paths on the diffusion radius and pressure on the tunnel segment become more significant.