考虑浆液黏度时空变化的速凝浆液渗透注浆扩散机制研究

发布时间：2018-03-14 13:34

本文选题：渗透注浆　切入点：速凝浆液　出处：《岩土力学》2017年02期 　论文类型：期刊论文

【摘要】：速凝类浆液的黏度时变性及双液注浆方式导致浆液黏度空间分布不均匀,在渗透注浆理论模型中应当考虑浆液黏度空间分布不均匀性的影响。基于黏度时变性宾汉流体本构模型,引入了描述渗流过程的均匀毛管组模型,建立了恒定注浆速率条件下考虑浆液黏度时空变化的一维渗透注浆扩散模型。设计了一维可视化渗透注浆扩散模拟试验系统,获得了不同介质渗透率及不同注浆速率条件下水泥-水玻璃浆液(C-S)注浆压力随时间变化规律。研究结果表明:考虑浆液黏度空间分布不均匀性时,孔口注浆终压计算值为试验值的1.2~1.4倍,浆液扩散距离计算值为试验测量值的0.9~1.1倍,计算值与试验值的误差在可接受范围内,所创建的理论模型可较好地描述速凝浆液一维渗透注浆扩散过程。不考虑浆液黏度空间分布不均匀性时,孔口注浆终压计算值为试验值的3.5~4.1倍,浆液扩散距离计算值为试验测量值的0.5~0.7倍,显著高估了注浆压力、低估了浆液扩散范围。因此,在注浆设计中应充分考虑速凝浆液黏度空间分布不均匀性。
[Abstract]:The time-varying viscosity of the quick-solidified slurry and the two-fluid grouting mode lead to the non-uniform distribution of the viscosity of the slurry in space. In the theoretical model of permeable grouting, the influence of the inhomogeneity of the spatial distribution of the viscosity of the slurry should be considered. Based on the constitutive model of Bingham fluid with time-varying viscosity, a uniform capillary group model is introduced to describe the seepage process. A one dimensional permeable grouting diffusion model considering the temporal and spatial variation of slurry viscosity was established under the condition of constant grouting rate, and a one dimensional visual simulation test system was designed. The variation of grouting pressure with time under different medium permeability and different grouting rate is obtained. The results show that when the spatial distribution of slurry viscosity is considered, The calculated value of the final grouting pressure at the orifice is 1.2 ~ 1.4 times of the test value, and the calculated value of the dispersion distance of the slurry is 0.9 ~ 1.1 times of the measured value. The error between the calculated value and the test value is within the acceptable range. The theoretical model established in this paper can well describe the one-dimensional permeable grouting diffusion process of the rapid solidified slurry. When the spatial distribution of the slurry viscosity is not considered, the calculated value of the final grouting pressure at the orifice is 3.5 ~ 4.1 times of the experimental value. The calculated value of slurry diffusion distance is 0.5 ~ 0.7 times of the measured value, which significantly overestimates grouting pressure and underestimates the range of slurry diffusion. Therefore, the non-uniformity of viscosity spatial distribution should be fully considered in grouting design.
【作者单位】：山东大学岩土与结构工程研究中心;
【分类号】：TU457

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