论文部分内容阅读
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。
In the process of infiltration and grouting into the sand media, the sand-framework particles filter the cement particles, resulting in the non-uniform diffusion of the cement particles, which is called the percolation effect. Using Kozeny-Carman model, the influence of percolation on the porosity, permeability coefficient and seepage velocity of sand slurry was analyzed. The effects of percolation on the seepage velocity of sand slurry were analyzed. Parameters of the grouting amount of variation, and then obtained by multiple regression of the cement slurry diffusion distance as a function of. The test results show that the infiltration effect has a great influence on the blocking of cement particles, and the cement particle mass fraction is the main factor that affects the diffusion distance of cement slurry. Based on the Darcy flow law and the regression equation, the theoretical values of the diffusion distance of cement slurry considering percolation effect and ignoring the percolation effect are respectively obtained and compared with the experimental values. The results show that the theoretical value of percolation loss is neglected Big error. The conclusion can guide the design of grouting, which has reference significance for similar projects.