充填注浆浆液稳定性能试验研究与工程应用

doi:10.13722/j.cnki.jrme.2016.1543

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Abstract

To evaluate the stability of filling grouting slurry，the slurry stability test device was designed. The slurry stability coefficient index was defined to quantitatively evaluate the stability of clay cement slurry and pure cement slurry under different grouting parameters. The influence of slurry stability on practical engineering was deduced，and the results were verified by practical engineering. The results show that the grouting parameters and strata conditions have significant impacts on the stability of pure cement slurry and clay cement slurry. Under the same condition，the stability of clay cement slurry is better than that of pure cement slurry. They are both negatively correlated with water solid ratio，and positively correlated with strata grouting pressure and drainage conditions. The slurry with better stability can provide a higher filling rate and its effective diffusion distance is relatively large，but its diffusion distance is relatively small. When the stability coefficient of the clay cement slurry is less than 83% or the stability coefficient of cement slurry is less than 71%，the shear failure along inclined plane occurs easily. In the practical filling grouting project，to ensure a better filling rate，it′s advised to choose slurry that with better stability and greatly match the relationship between hole spacing and slurry stability. Under critical strata condition，the slurry stability coefficients can be obtained by adjusting the slurry water-solid ratio and grouting pressure. The experimental results can provide some reference for filling grouting theory and practical engineering case.

Key words： tunnelling engineering filling grouting stability coefficient of slurry clay cement slurry pure water slurry

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1543 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3604

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