Abstract：To solve the problems of easy dispersion, low retention rate, long setting time, transportation segregation and pipe blockage of ordinary single slurry for synchronous grouting of shield tunnel in water-rich strata, an experimental study was conducted on the mix proportion of inert filling materials based on the shield tunnel project of West extension line of Changchun Metro Line 2. To meet the requirements of high filling behind the segments and high fluidity in the pipeline, the inert slurry with low cement and high aggregate was selected. A special filling agent for synchronous grouting was developed, which could effectively reduce the bleeding and segregation of slurry, accelerate the setting process, and improve the filling strength. The test results show that the bleeding rate of slurry decreases first and then increases with the increase of the filling agent content TIR. After 1 h, the slurry with bleeding rate curve located in the reasonable bleeding area of IV meets the engineering requirements and TIR=1.2% shall be the best mixing ratio. Excessive TIR may increase the bleeding rate and impair the fluidity, setting process, and early strength of the slurry. The BC1201E 3D digital video microscope system was used to analyze the microstructure of slurry specimens at different ages. The results show that the special filling agent can improve the uniformity of the slurry, reduce the small pores on the surface, and improve the filling quality behind the segments. Besides, the new inert filling slurry may ensure the successful passing of shield machine through the section with risk sources, and the maximum ground settlement may be finally controlled within 12mm.
万泽恩 李树忱 赵一民 王曼灵 赵世森 周松. 富水地层盾构隧道同步注浆惰性充填材料配比与试验研究[J]. 土木工程学报, 2021, 54(7): 123-132.
Wan Zeen Li Shuchen Zhao Yimin Wang Manling Zhao Shisen Zhou Song. Experimental study on mix proportion of inert filling materials for synchronous grouting of shield tunnel in water-rich strata. 土木工程学报, 2021, 54(7): 123-132.
