Study on Longitudinal Stress Relaxation Effect and Reinforcement Technology of Segment Lining during Shield Docking

Geng, Zhe; Yuan, Dajun; Wang, Dan; Zhao, Yong; Xie, Tong

doi:10.3390/app12062831

Cited by 4 publications

(1 citation statement)

References 26 publications

(31 reference statements)

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“…In recent years, the slurry shield tunnelling method has been widely used in the construction of river-crossing tunnels and submarine tunnels under regions with complex hydrogeology [1][2][3]. Examples include the Tokyo Bay Tunnel [4], Nanjing Yangtze River Tunnel [3,5], Tuen Mun-Chek Lap Kok Tunnel [4,6] and other projects [7][8][9]. With the slurry shield method, slurry pressure is applied to effectively balance the stratum soil pressure and water pressure and maintain the stability of the excavation surface [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Reusing Fine Silty Sand Excavated from Slurry Shield Tunnels as a Sustainable Raw Material for Synchronous Grouting

Wang

Liu²,

Jiang

et al. 2023

Coatings

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Using the Nanjing Dinghuaimen Yangtze River Tunnel project as a case study, we proposed a method to reuse the excavated silty-fine sand by adjusting the proportion of the waste sand to replace the commercial sand. This would address the issue of recycling the significant amount of waste sand generated when the slurry shield passes through the silty-fine sand stratum. Moreover, we have evaluated grout indicators such as density, fluidity, consistency, bleeding rate, volumetric shrinkage, setting time, and unconfined compressive strength and examined how the particle size and distribution of the sand affected the grout’s performance. The findings show that as the replacement ratio increases, the grout’s density, fluidity, consistency, and bleeding rate gradually increase; meanwhile, the volumetric shrinkage increases initially before decreasing; the setting time decreases gradually; the unconfined compressive strength initially decreases before increasing. The key factor altering the grout’s performance when the replacement ratio is less than 50% is the weakening of the adsorption effect of fine sand particles on water due to the increase in the sand’s fineness modulus. When it is greater than 50%, the particle size of the sand tends to be distributed nonuniformly and fine particles fill the voids between larger particles, thus contributing to the changes in grout properties.

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