SH固土剂在遗址土中的渗透注浆扩散规律

风化是中国西北地区土遗址最常见的病害之一。土遗址防风化方法主要是表面喷洒和钻孔注浆。通过对不同干密度重塑土样的钻孔注浆试验，来寻找改性聚乙烯醇（SH）固土剂扩散规律，建立了SH固土剂渗透范围模型——旋转抛物体，解释了产生该渗透现象的原因，并通过计算得到了SH固土剂渗透加固土体体积以及渗透范围内SH的固含量，确定了土遗址中含该固含量的SH固土剂足以对其产生防风化的作用。利用Image J图像分析软件对SEM照片进行处理，获得了不同干密度条件下孔隙分布、孔隙分形维数和平均Feret直径。研究发现，随着干密度增大，土体渗透性减弱，其主要原因是中、大孔隙被压缩成微、小孔隙，并建议将SH固土剂渗透注浆应用于平均Feret直径大于4.98 ?m的土体。最后通过多元线性回归的方法发现，注浆量对渗透半径影响最大，其次是平均Feret直径，孔径的影响最小。

Infiltration grouting diffusion law of SH agent in earthen sites

Weathering is one of the most common diseases for earthen sites in northwest China. Surface sprinkling and hole grouting are two main methods to prevent weathering. Grouting experiments are performed on remolded soil samples with different dry densities to reveal the infiltration grouting diffusion laws of SH agent. An infiltration model of SH agent is established and the experimental phenomenon is reasonably explained. The volume of the soil reinforced by SH and the solid content of SH agent are obtained by calculation, and the solid content is proved to be sufficient to resist weathering for earthen sites. Through SEM images processed by Image J, pore distribution, pore fractal dimension and average Feret diameter under different dry densities are obtained. It is found that the permeability of soil decreases with the increase of dry density, because medium and large pores are compressed into micro and small pores. It is suggested that grouting experiment of SH agent should be applied to soil whose average Feret diameter is more than 4.98 ?m. Finally, by the method of multiple linear regression, it is found that grouting volume has the greatest effect on the infiltration radius, followed by average Feret diameter and aperture.