速凝浆液裂隙动水注浆扩散数值模拟与试验验证

发布时间：2018-04-05 19:36

本文选题：土力学　切入点：裂隙注浆　出处：《岩石力学与工程学报》2017年S1期

【摘要】：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。
[Abstract]:Considering the time-varying characteristics of the viscosity of the cement paste, two kinds of quick solidification slurry, cement water glass slurry and polymer modified cement slurry, which are commonly used in hydrodynamic grouting, are considered.The finite element calculation software COMSOL Multiphysics is used to establish the numerical model of crack grouting diffusion under dynamic water condition. The law of crack grouting diffusion under dynamic water condition is studied and the time-varying characteristics of different viscosity are analyzed.The effect of initial dynamic flow velocity and grouting rate on the grouting diffusion process is studied. The numerical simulation results are compared with the model tests to verify the effectiveness of the numerical simulation method.The results show that the diffusive morphology of the slurry shows obvious difference in the reverse water direction and the downstream direction, and the pressure at the inlet boundary gradually approaches to the distal groundwater pressure, and the flow velocity is higher near the fissure boundary and around the flow zone at the initial stage of grouting.In the later stage of grouting, the variation of velocity in the whole fissure is small, and the increase of initial dynamic flow velocity and grouting rate will lead to the increase of the pressure and velocity of the crack under the experimental conditions.The effect of grouting rate on pressure distribution in fracture is similar to that between C-S slurry and GT 1 slurry, but the diffusion law is slightly different due to the difference of viscosity time variation between them.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家重点研究发展计划项目(2016YFC0801600)~~
【分类号】：TU45

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