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Experimental Study on Rheological Properties of Slurry in Slurry Shield
Tunnelling Crossing Sea
(1. China Railway 14th Bureau Group Co., Ltd., Jinan 250101; 2. School of Qilu Transportation, Shandong University, Jinan 250002;3. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061)
Abstract Given the fact that the rheological properties of seawater slurry under the effect of various factors and the
rheological equation are still unknown, a set of laboratory rheological tests have been conducted by using two typical viscosifiers, in order to investigate how different contents of viscosifier and ambient temperatures will affect the rheological parameters of seawater slurry and reveal the rheological parameters development mechanism of slurry from the microscopic aspect. The results indicate: compared with sodium carboxymethyl cellulose (CMC), the viscosifier polyanionic cellulose (PAC) of the same content will bring better result of improving the fluidity of seawater slurry,significantly improve the viscosity and physical stability of slurry, and the viscosity of seawater slurry with 0.4%PAC and 12% sodium bentonite is increased by a large margin. With different contents of PAC, the flow pattern of seawater slurry always matches the power law model, and the consistency coefficient k and rheological index n decrease and increase respectively as temperature increases. In the microscopic aspect, the interaction between the oxhydryl
on the molecular chain of viscosifier and the bentonite particle creates the intramolecular hydrogen bond, which is the main factor that allows the viscosifier to increase the fluidity of slurry.
Abstract：
Given the fact that the rheological properties of seawater slurry under the effect of various factors and the
rheological equation are still unknown, a set of laboratory rheological tests have been conducted by using two typical viscosifiers, in order to investigate how different contents of viscosifier and ambient temperatures will affect the rheological parameters of seawater slurry and reveal the rheological parameters development mechanism of slurry from the microscopic aspect. The results indicate: compared with sodium carboxymethyl cellulose (CMC), the viscosifier polyanionic cellulose (PAC) of the same content will bring better result of improving the fluidity of seawater slurry,significantly improve the viscosity and physical stability of slurry, and the viscosity of seawater slurry with 0.4%PAC and 12% sodium bentonite is increased by a large margin. With different contents of PAC, the flow pattern of seawater slurry always matches the power law model, and the consistency coefficient k and rheological index n decrease and increase respectively as temperature increases. In the microscopic aspect, the interaction between the oxhydryl
on the molecular chain of viscosifier and the bentonite particle creates the intramolecular hydrogen bond, which is the main factor that allows the viscosifier to increase the fluidity of slurry.
WANG Chengzhen1 DING Wantao2,
3 YU Wenrui1 WANG Zhicheng1 SUN Tengyun1 WANG Zhongrong2
.Experimental Study on Rheological Properties of Slurry in Slurry Shield
Tunnelling Crossing Sea[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(6): 237-245
2023, Vol. 60 