Influence of Special Plasticizer for Shield Tunnel on Properties
of Synchronous Grouting Slurry

doi:10.3973/j.issn.2096-4498.2022.05.005

Tunnel Construction ›› 2022, Vol. 42 ›› Issue (5): 798-806.DOI: 10.3973/j.issn.2096-4498.2022.05.005

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Influence of Special Plasticizer for Shield Tunnel on Properties of Synchronous Grouting Slurry

WU Yankun^{1, 2}, LI Xiaodong¹, CHEN Jian^{2, *}, SU Xiuting³, MA Shuai⁴

(1. Tsinghua University, Beijing 100084, China; 2. China Railway 14th Bureau Group Co., Ltd., Jinan 250014,
Shandong, China; 3. Ocean University of China, Qingdao 266100, Shandong, China;  4. Zhengzhou University, Zhengzhou 450001, Henan, China)

Online:2022-05-20 Published:2022-06-02

Abstract

Abstract:

A laboratory test is conducted to determine the properties of grout with different amounts of plasticizer to analyze the influence of a special plasticizer on the properties of shield tunneling grout. Moreover, the consolidation characteristics of the improved grout in different strata are analyzed. The results show the following: (1) The special plasticizer for the shield tunnel grout can shorten the setting time of the grout without affecting the grout strength. The bleeding rate, consistency, and fluidity of the grout decrease with a reduction in the plasticizer amount. (2) The optimal amount of special plasticizer is 0.4 %~1.2 %, which can greatly improve the gout performance and shorten the grout setting time. (3) The improved grout′s consolidation time, settlement, and strength are closely related to the ground properties. The consolidation completion time and the 28day unconfined compressive strength of the improved grout in silty clay, silty sand, and coarse sand formations decrease in turn, whereas the final settlement increases in turn.

Key words: shield tunneling, synchronous grouting, plasticizer, slurry properties, consolidation characteristics

WU Yankun, LI Xiaodong, CHEN Jian, SU Xiuting, MA Shuai.

Influence of Special Plasticizer for Shield Tunnel on Properties of Synchronous Grouting Slurry [J]. Tunnel Construction, 2022, 42(5): 798-806.

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Influence of Special Plasticizer for Shield Tunnel on Properties of Synchronous Grouting Slurry

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