宾汉体浆液扩散半径的研究及应用

Study on grouting diffusion radius of Bingham fluids

本文在广义达西定律及球形扩散理论模型的基础上,推导出了宾汉体(BinhamFluid)浆液在砂土中进行渗透注浆时有效扩散半径的计算公式,并提出了求解方法,给出了该公式在防洪堤注浆防渗帷幕工程中的应用。运用该公式可以计算出宾汉体浆液扩散半径满足设计要求时所需注浆压力及其沿地层深度的变化,与Maag公式相比,发现达到同样扩散半径所需的注浆压力,Maag公式的计算结果明显偏小。施工检测结果表明实测的扩散半径与本文公式设计值虽然有差异,但基本能满足要求。

Based on the generalized Darcy′s law and theory for spherical diffusion model,the formula for calculating the effective diffusion radius of Bingham fluid injected into homogeneous sandy stratum in grouting is deduced and the algorithm for solving this formula is proposed.This method is applied to design the grouting for constructing the curtain wall of an embankment.The variation of necessary grouting pressure along the depth of stratum is calculated.The validity of the proposed calculation method is verified by the inspection of the grouting result.For further investigating the feasibility of this method,the calculated result is compared with that by using the Maag formula.It is found that the necessary pressure for forming the same diffusion radius calculated by Maag formula is much less than that of proposed method.