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针对动水注浆中常用的2种速凝浆液,水泥–水玻璃浆液与高聚物改性水泥浆液,考虑浆液黏度时变特性,应用有限元计算软件COMSOL Multiphysics建立动水条件下裂隙注浆扩散的数值模型,研究动水条件下裂隙注浆扩散规律并分析不同黏度时变特性、初始动水流速与注浆速率对注浆扩散过程的影响,并将数值模拟结果与模型试验进行对比,验证数值模拟方法的有效性。研究结果表明:浆液扩散形态在逆水方向和顺水方向表现出明显的差异性;进水边界处的压力逐渐趋近于远端的地下水压强,注浆初期在裂隙边界附近及绕流区内流速较高,注浆后期整个裂隙内的流速变化幅度不大;在试验条件下,初始动水流速与注浆速率的提高均会导致裂隙内压力及流速的增加,注浆速率对裂隙内压力分布的影响比初始动水流速显著;C-S浆液与GT–1浆液扩散规律类似,但由于两者黏度时变性的差异导致两者扩散规律稍有差别。
Aiming at the two kinds of quick-setting slurry, cement-water glass slurry and polymer-modified cement slurry commonly used in hydrodynamic grouting, considering the time-varying characteristics of slurry viscosity, finite element software COMSOL Multiphysics was used to establish fissure grouting The diffusion numerical model was used to study the grouting diffusion rules under the condition of dynamic water and to analyze the influence of time-varying characteristics, initial flow velocity and grouting rate on the grouting diffusion process under different water viscosities. The numerical simulation results were compared with the model tests. Verify the effectiveness of the numerical simulation method. The results show that the diffusion pattern of slurry shows obvious difference in the direction of reverse water and the direction of water flow. The pressure at the water inflow boundary gradually approaches the pressure of the groundwater in the far end. In the experimental conditions, the initial hydrodynamic velocity and the increase of the grouting rate will lead to the increase of the pressure and velocity in the fracture, and the influence of the grouting rate on the pressure distribution in the fracture The effect of slurry flow rate was more significant than that of initial water flow. The slurry of CS slurry was similar to that of GT-1 slurry. However, the difference of viscosity between the two solutions resulted in a slight difference in the diffusion between the two.