高渗透性注浆材料渗透能力对比试验分析

Comparative Experimental Analysis of Permeability of Highly Permeable Grouting Materials

为探究不同高渗透性注浆材料渗透能力的大小,以超细水泥、脲醛树脂、硅溶胶3种材料为研究对象,设计了室内无压河砂介质及有压黏土介质注浆试验,根据注浆后两种介质中的固结体几何形状及裂隙发育程度,分析3种材料的孔内渗透能力强弱及扩散机制。结果表明,3种材料中,硅溶胶孔内渗透能力最强,脲醛树脂次之,超细水泥最小,且随着介质渗透性降低,其扩散方式由孔内渗流向劈裂裂隙管道流转变,浆液渗透能力越弱,这一过程转变的越快。

In order to investigate the permeability of different highly permeable grouting materials,three materials,namely ultrafine cement,urea formaldehyde resin,and silica sol,were taken as the research objects.Indoor grouting tests were designed for nonpressurized river sand media and pressurized clay media.Based on the geometric shape of the consolidated body and the degree of fracture development in the two media after grouting,the strength of the intra-pore permeability and diffusion mechanism of the three materials were analyzed.The results showed that,among the three materials,silica sol had the strongest intra-pore permeability,followed by urea formaldehyde resin,and ultra-fine cement had the weakest permeability.As the permeability of the medium decreased,its diffusion mode changed from intra-pore seepage to fracture pipeline flow,and the weaker the permeability of the slurry,the faster this process changed.