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Influences of polyanionic celluloses and temperature on the rheological property of seawater slurries
Abstract As an increasing number of submarine tunnels are being constructed by the slurry shield tunnelling method, seawater intrusion into slurries and variations in strata temperature are inevitably encountered during construction. They will lead to obvious deterioration in rheological properties of slurries, which can be adverse for the filter cake formation and even cause tunnel face instability. Considering the design of the slurry parameters and the actual slurry support effect, it is essential to select a suitable slurry ingredient and investigate the rheological properties of seawater slurries under different temperature environments. Using polyanionic celluloses (PAC) as the additive to seawater slurries was proposed in this paper. The influence of PAC contents on the rheology and physical stability of seawater slurries was investigated through laboratory experiments, with PAC contents varying from 0 to 0.4%. The rheology enhancement mechanism of PAC was also analyzed. Furthermore, the flow pattern and constitution relationship of seawater slurries with 0.4% PAC were studied at different temperatures from 2℃ to 30℃. The results show the presence of PAC can significantly enhance the viscosity and physical stability of seawater slurries. The seawater slurries incorporating 0.4% PAC and 12% Na-bentonite can maintain an excellent colloidal rate with 97.5% and a high viscosity, which was recommended to be a prospective mixing proportion used in slurry projects. Additionally, the flow characteristic of seawater slurries with different PAC contents can be described by the power law model very well. Moreover, with the increase in temperature, the rheological index showed an increasing trend, but the consistency coefficient gradually decreased. The constitutive equation of seawater slurries considering the effect of temperature was proposed. This research will provide significant guidance for the selection of slurry parameters and the establishment of seawater slurry infiltration theories during the construction of submarine tunnels.
Influences of polyanionic celluloses and temperature on the rheological property of seawater slurries
Abstract As an increasing number of submarine tunnels are being constructed by the slurry shield tunnelling method, seawater intrusion into slurries and variations in strata temperature are inevitably encountered during construction. They will lead to obvious deterioration in rheological properties of slurries, which can be adverse for the filter cake formation and even cause tunnel face instability. Considering the design of the slurry parameters and the actual slurry support effect, it is essential to select a suitable slurry ingredient and investigate the rheological properties of seawater slurries under different temperature environments. Using polyanionic celluloses (PAC) as the additive to seawater slurries was proposed in this paper. The influence of PAC contents on the rheology and physical stability of seawater slurries was investigated through laboratory experiments, with PAC contents varying from 0 to 0.4%. The rheology enhancement mechanism of PAC was also analyzed. Furthermore, the flow pattern and constitution relationship of seawater slurries with 0.4% PAC were studied at different temperatures from 2℃ to 30℃. The results show the presence of PAC can significantly enhance the viscosity and physical stability of seawater slurries. The seawater slurries incorporating 0.4% PAC and 12% Na-bentonite can maintain an excellent colloidal rate with 97.5% and a high viscosity, which was recommended to be a prospective mixing proportion used in slurry projects. Additionally, the flow characteristic of seawater slurries with different PAC contents can be described by the power law model very well. Moreover, with the increase in temperature, the rheological index showed an increasing trend, but the consistency coefficient gradually decreased. The constitutive equation of seawater slurries considering the effect of temperature was proposed. This research will provide significant guidance for the selection of slurry parameters and the establishment of seawater slurry infiltration theories during the construction of submarine tunnels.
Influences of polyanionic celluloses and temperature on the rheological property of seawater slurries
Wang, Zhongrong (author) / Guo, Wenjing (author) / Qin, Wang (author) / Wang, Chengzhen (author) / Ding, Wantao (author)
2022-08-22
Article (Journal)
Electronic Resource
English
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