Test Method and Influencing Factors of Fluidity of Synchronous Grouting Material in Shield Tunnel Construction

被引：0
|
作者：
Huang D. [1 ,2 ]
Luo Z. [1 ,2 ]
Luo W. [1 ,2 ]
Xu C. [1 ,2 ]
Shi H. [1 ,2 ]
Zhang L. [3 ]
机构：
[1] Engineering Research Center of Railway Environmental Vibration and Noise, Ministry of Education, East China Jiaotong University, Nanchang
[2] State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang
[3] Department of Railway Engineering, Tianjin Railway Technical and Vocational College, Tianjin
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 03期
关键词：
Grouting material; Pressure loss; Shield tunnel; Surface-to-volume ratio; Synchronous grouting;
D O I：
10.3969/j.issn.1001-4632.2022.03.11
中图分类号：
学科分类号：
摘要：
In the construction of existing shield tunnel, the fluidity of synchronous grouting material is usually tested by consistency systems or gauges. However, the interference of manual operation as well as the randomness of the test have great impact on the test results. Moreover, the sinking depth of the test cone is not directly related to the flow resistance of slurry in the grouting pipe. Therefore, a set of fluidity test devices for synchronous grouting material is developed, which can directly measure the pressure loss of slurry in the grouting pipe. The pressure loss per unit length of the grouting material in the grouting pipe is proposed as the evaluation index of the grouting material fluidity, and the ratio of the surface area of the aggregate particles in the grouting material to the volume of the slurry (surface-to-volume ratio) is taken as the influencing parameter to analyze the grouting material fluidity. The calculation formula for the ratio of superficial area to volume is deduced. The developed fluidity test device is used to test and compare the fluidity of synchronous grouting materials used on site and grouting material samples prepared indoors with different surface-to-volume ratios. The results show that the developed fluidity test device for synchronous grouting material is feasible. The surface-to-volume ratio of grouting material is the main influencing parameter of its fluidity. The pressure loss per unit length of grouting material in the grouting pipe approximately linearly increases with the increase of the initial pressure. The pressure loss per unit length of grouting material in the grouting pipe and the initial pressure suggest an approximately linear relationship. The content of aggregate (solid particles with particle size greater than 0. 075 mm) in the grouting material is higher, that is, the larger the surface-to-volume ratio, the higher the pressure loss per unit length in the grouting pipe. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：94 / 102
页数：8
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