异形盾构同步注浆运动模式SPH模拟及试验验证

借助光滑粒子流体动力学(SPH)方法对异形盾构同步注浆的整体填充规律和局部扩散模式进行数值模拟,分析浆液颗粒的细观运动机制.为了验证数值模拟的合理性,采用含有机玻璃材料和拍摄仪器的可视化大型模型试验重现浆液在异形空间中的实时流淌过程,并结合试验结果对比验证.研究表明:浆液的扩散模式具有纵环向相互关联的挤压填充性流动特征,盾尾肩顶部注浆扩散面较为均匀,拱腰靠侧壁附近浆液有明显的上升通道,底部出浆口处浆液挤压淤积严重.

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

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.