盾构隧道壁后注浆浆液组分对其渗透性影响研究

在盾构施工中,选用浆液配比时往往根据经验,造成浆液性质和地层不匹配,得不到理想的注浆效果。从浆液配比方面入手,采用单因素分析法,做变水头试验测出浆液的渗透系数,得到不同浆液配比时,浆液自身渗透性的变化规律,并进一步分析浆液与地层的匹配关系。试验结果表明,当浆液其它成分不变时,浆液自身的渗透性随水泥、粉煤灰、膨润土用量的增多而减小,随砂、减水剂用量的增多而增大。

Experiment study of the influence of shield tunnel grouting behind segment components on its permeability

In practical engineering, slurry ratio are usually confirmed by experience, which causes slurry properties and formation mismatching, and cannot get ideal grouting effects. In this paper, we will start with the slurry ratio, using single factor analysis to measure permeability coefficient by doing variable head test. On the basis of experiment, we can discuss the change law of slurry permeability in different slurry ratio, and make a further analysis of the matching relationship between slurry and formation. The results showed that: when other components of slurry remain unchanged, slurry permeability decreased along with the cement, fly ash, bentonite growth, and increased along with sand, water reducing agent growth, which could provide an reference for selection of slurry in future engineering.