A novel real-time monitoring system for the measurement of the annular grout thickness during simultaneous backfill grouting

Zeng, Li; Zhou, Biao; Xie, Xuansong; Zhao, Yonghui; Hai, Liu; Zhang, Yonglai; Shahrour, Isam

doi:10.1016/j.tust.2020.103567

Cited by 25 publications

(5 citation statements)

References 21 publications

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“…where m is the grouting volume ratio, which represents the ratio of the actual grouting volume to the theoretical grouting volume, usually ranging from 130% to 250% [36]. Equation ( 12) is substituted into Equation (17) as follows:…”

Section: Circumferential Grout Pressure Distributionmentioning

confidence: 99%

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Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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The grout pressure in the shield tunnel tail void during synchronous grouting is the key to controlling ground settlement and restraining the segment. However, the circumferential, longitudinal, and radial distribution of grout pressure considering the temporal variation in grout viscosity has not been well explored yet. In this study, a theoretical model of grout pressure distribution and dissipation considering the temporal variation in Bingham grout viscosity was established. The simulation results of the pressure model were verified by field-measured data. The results showed that the radial and longitudinal distributions of grout pressure considering the temporal variation in grout viscosity were closer to the field-measured data. The impacts of the main parameters on the pressure distribution and dissipation were analyzed. Compared with the effect of the shield tail void thickness, tunnel radius and yield shear stress have greater effects on grout pressure during the circumferential filling phase. During the longitudinal and radial diffusion phases, the increase in soil porosity and permeability coefficient was conducive to grout diffusion. The increase in the grout viscosity reduces the pressure loss during the grout flow process. The results of this research can provide a theoretical basis for the grout design process in shield tunnels.

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Section: Circumferential Grout Pressure Distributionmentioning

confidence: 99%

“…Grout Pressure (Pa) θ Range (Rad) 36 36 36 36 When the grout flow direction is downward, the circumferential filling pressure of the grout is:…”

Section: Grouting Hole Locationsmentioning

confidence: 99%

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Ma,

Sun,

Jiang

et al. 2023

Applied Sciences

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“…Zeng et al [37] used GPR to establish a detection system that can monitor the grouting situation in real time while the shield machine is tunneling. Synchronous analysis was carried out using a three-dimensional time-domain finite difference approach.…”

Section: Experiments and Field Casesmentioning

confidence: 99%

Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments

et al. 2021

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Injecting grout into the gaps between tunnel shield segments and surrounding rocks can reduce ground subsidence and prevent ground water penetration. However, insufficient grouting and grouting defects may cause serious geological disasters. Ground penetrating radar (GPR) is widely used as a nondestructive testing (NDT) method to evaluate grouting quality and determine the existence of defects. This paper provides an overview of GPR applications for grouting defect detection behind tunnel shield segments. State-of-the-art methodologies, field cases, experimental tests and signal processing methods are discussed. The reported field cases and model test results show that GPR can detect grouting defects behind shield tunnel segments by identifying reflected waves. However, some subsequent problems still exist, including the interference of steel bars and small differences in the dielectric constants among media. Recent studies have focused on enhancing the signal-to-noise ratio and imaging methods. Advanced GPR signal processing methods, including full waveform inversion and machine learning methods, are promising for detecting imaging defects. Additionally, we conduct a preliminary experiment to investigate environmental noise, antenna configuration and coupling condition influences. Some promising topics, including multichannel configuration, rapid evaluation methods, elastic wave method scanning equipment for evaluating grout quality and comprehensive NDT methods, are recommended for future studies.

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“…GPR is a non-destructive survey technology based on electromagnetic field theory, which has been widely used in highway field. At the same time, it is noted that GPR is often used to grouting evaluate of tunnel (Qin et al 2021, Ye et al 2020, Zeng et al 2020.…”

Section: Introductionmentioning

confidence: 99%

Research on evaluation index of road base grouting quality based on GPR image recognition method

Chen,

Lu,

Chang

et al. 2024

Preprint

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This paper presents a case study on a road base grouting project, utilizing 3-D Ground Penetrating Radar (GPR) technology to obtain plane amplitude gray maps before and after grouting at different depths of the road base. Statistical analysis was conducted by extracting gray values from these maps using image recognition technology. The study yielded the following conclusions: Firstly, a comparison of 80 sets of gray maps revealed a higher level of uniformity in the maps after grouting, indicating the effective reinforcement of the road base through the grouting process. Secondly, the normal distribution curves plotted using the extracted gray values showed that the curve after grouting had a smoother shape and a lower peak value compared to the curve before grouting. Finally, while there was no significant correlation between the expected value and grouting quality, the standard deviation exhibited a significant correlation. Therefore, it is recommended to assess grouting quality qualitatively through the examination of the normal distribution curve and quantitatively by considering the standard deviation. These findings provide valuable insights for evaluating grouting quality in similar projects, contributing to the improvement of road construction and maintenance practices.

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A novel real-time monitoring system for the measurement of the annular grout thickness during simultaneous backfill grouting

Cited by 25 publications

References 21 publications

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Pressure Model Study on Synchronous Grouting in Shield Tunnels Considering the Temporal Variation in Grout Viscosity

Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments

Research on evaluation index of road base grouting quality based on GPR image recognition method

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