A study of siltation mud formation mechanism and prediction model of vacuum preloading method
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摘要: 针对真空预压加固处理过程中容易形成的淤堵现象，结合室内真空预压模型试验，进行了不同颗粒组成和不同真空度条件下的室内试验，揭示了淤堵泥层的形成特性和机理，建立了排水量及平均含水率随时间变化的预测模型。试验表明，在低真空度作用下，由于其渗透路径宽而长，淤堵泥层厚度较大，但含水率和密实度低，形成的孔隙直径分布广且分布较均匀；而在高真空度作用下渗透路径窄而短，淤堵泥层厚度小但含水率和密实度高，形成的孔隙直径较小且分布集中；黏粒含量越高形成的孔隙直径越小，集中程度较高，滤层结构越稳定。Abstract: For the easily formed clogging phenomenon in the reinforcement process of vacuum preloading, the indoor tests under the conditions of different particle composition and different vacuum pressure value combined with the indoor vacuum preloading model test had been conducted. The formation features and mechanism of the siltation mud had been revealed, and the forecast model of drainage amount and the average moisture content had been built up preliminarily. The results show that the thickness of siltation mud is large with low moisture content and compactness due to the seepage paths are wide and long under lower vacuum degree, and the diameter distribution of pores is wide and uniform. However, the seepage paths are narrow and short under higher vacuum degree, the thickness of siltation mud is small with high moisture content and compactness, and the diameter of pores is small and the distribution is uniform. The higher clay content, the smaller the pore diameter, the higher degree of the concentration, and the more stable of the filter layer structure.
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Key words:
- vacuum preloading method /
- hydraulic fill mud /
- siltation mud /
- prediction model /
- seepage path
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