Field Test on Construction Influence on LargeDiameter
Shield Tail Segment Floating of Tunnel

HE Xiaobin, MA Shuai, CHEN Jian, LI Mingyu, YU Liucheng, HAO Jun

doi:10.3973/j.issn.2096-4498.2023.S2.015

Tunnel Construction >

2023 , Vol. 43 >Issue S2: 136 - 143

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.S2.015

Field Test on Construction Influence on LargeDiameter Shield Tail Segment Floating of Tunnel

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(1. China Railway 14th Bureau Group Shield Engineering Co., Ltd., Nanjing 211800, Jiangsu, China; 2. China Railway 14th Bureau Group Co., Ltd., Jinan 250101, Shandong, China; 3. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; 4. China Railway Construction Underwater Tunnel Engineering Laboratory, Jinan 250101, Shandong, China)

Online published: 2024-03-27

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Abstract

To explore the floating patterns of largediameter shield tail segments in high water pressure silty clay strata and its correlation with construction parameters, an indoor grout mixing proportion and property test and a field test in Yellow rivercrossing tunnel in Jinan, China are conducted. The results reveal the following: (1) Increasing the dosage of cement, fly ash, and waterreducing agent shortens the setting time of the grout, which is conducive to the decrease of segment floating. A decrease in the bleeding rate, fluidity, and consistency is unfavorable to segment floating control. (2) The floating of largediameter shield tail segments presents a parabolic. It quickly rises within 10 hours after synchronous grouting, then slows down rapidly, and becomes stable after 25－30 h. (3) The floating of segments are affected by various factors, it is recommended to dynamically adjust the grout mixing proportions, control the difference between of slurry discharged and entering volumes, reduce the cutterhead contact pressure, maintain the cutterhead torque, reduce the difference of thrust pressure between upper and lower section jack and synchronous grouting pressure difference, as well as appropriately extend the temporary downtime, driving and assembling time of the segment, and reduce tunneling speed.

Key words： ; tunnel engineering; large diameter; shield tunnel; segment floating; synchronous grouting; field test

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HE Xiaobin, MA Shuai, CHEN Jian, LI Mingyu, YU Liucheng, HAO Jun . Field Test on Construction Influence on LargeDiameter Shield Tail Segment Floating of Tunnel[J]. Tunnel Construction, 2023 , 43(S2) : 136 -143 . DOI: 10.3973/j.issn.2096-4498.2023.S2.015

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