考虑渗滤效应的砂土介质注浆扩散规律研究

发布时间：2018-08-03 13:01

【摘要】：在对砂土介质渗透注浆过程中,砂土骨架颗粒对水泥颗粒产生滤过作用,导致水泥颗粒发生不均匀扩散,称之为渗滤效应。采用Kozeny-Carman模型,分析了渗滤效应对砂土介质孔隙率、渗透系数及水泥浆渗流速度的影响;应用自主研发的恒压注浆装置,研究了不同颗粒级配砂样在不同注浆参数下注浆量的变化规律,然后通过多元回归获得了水泥浆扩散距离的函数关系式。试验结果表明,渗滤效应对水泥颗粒滞留封堵的影响较大,水泥颗粒质量分数是影响浆液扩散距离的主控因素。依据达西渗流定律和回归关系式分别得到了考虑渗滤效应和忽略渗滤效应时水泥浆扩散距离的理论值,并与试验值进行比对分析,结果表明,忽略渗滤效应的理论值存在较大误差。所得结论可指导注浆设计,对类似工程具有借鉴意义。
[Abstract]:In the process of infiltration grouting in sand medium, the sand skeleton particles have a filtration effect on the cement particles, which leads to the uneven diffusion of the cement particles, which is called the percolation effect. The influence of the percolation effect on the porosity, permeability coefficient and the seepage velocity of the water slurry is analyzed by using the Kozeny-Carman model, and the constant pressure developed by ourselves is applied. The grouting device is used to study the change law of the grouting quantity of different particle grading sand samples under different grouting parameters, and then the function relation of the diffusion distance of cement slurry is obtained by multiple regression. The experimental results show that the influence of the filtration effect on the retention and plugging of cement particles is greater, and the mass fraction of water mud particles is the main factor affecting the diffusion distance of the slurry. The theoretical values of the diffusion distance of cement slurry are obtained according to the Darcy's law of percolation and the regression equation, and the theoretical values are compared with the experimental values. The results show that there is a large error in the theoretical value neglecting the percolation effect. The conclusion can guide the grouting design and borrow the similar projects. Make sense.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家自然科学青年基金(No.51309146) 山东大学自主创新基金(No.2012GN011)~~
【分类号】：TU472

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