Temporal and spatial distribution of the grout pressure and its effects on lining segments during synchronous grouting in shield tunnelling

Liang, Yue; Zhang, J.; Lai, Zhengshou; Huang, Qi; Huang, Linchong

doi:10.1080/19648189.2017.1364299

Cited by 26 publications

(16 citation statements)

References 9 publications

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“…In particular, when the overlaying soil is shallow, segment floating is more prominent. For example, during the construction of underwater shield tunnels such as Dalian Road Tunnel (Shanghai), Yangtze River Tunnel (Shanghai), Qingchun Road Tunnel (Hangzhou), and Shiziyang Tunnel (Guangzhou) of China, the tunnel segments have appeared to varying degrees of buoyancy [4,8,9].…”

Section: Introductionmentioning

confidence: 99%

Study on the Floating of Large Diameter Underwater Shield Tunnel Caused by Synchronous Grouting

Huang²,

Gao³

et al. 2022

Geofluids

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Synchronous grouting is the key factor causing segment floating during the construction of shield tunnel, especially the grout ratio and the control of the grouting pressure. In this paper, the ratio of grout material was optimized through multiple groups of physical and mechanical tests. The results showed that 0.3% content of water reducing agent in grout could improve the ability of water resistance significantly. 2.9% content of bentonite could reduce bleeding rate of grout and grout setting time and improve the fluidity in the meantime. Then, the distribution law of grout along the segment ring in the filling stage was studied based on a typical underwater tunnel in China. The results showed that the theoretical calculation of grouting pressure was between 0.15 MPa and 0.18 MPa, which were in good agreement with the measured data. The grouting pressure distribution is affected by four parts including the lateral earth pressure, foundation reaction, grout shear stress, and gravity.

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Section: Introductionmentioning

confidence: 99%

Study on the Floating of Large Diameter Underwater Shield Tunnel Caused by Synchronous Grouting

Huang²,

Gao³

et al. 2022

Geofluids

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“…Overall, the grout diffusion process during shield tunnelling can be summarised into the stages of filling diffusion, penetration diffusion, compaction diffusion and so forth. 28 At present, many studies mainly concern the grout penetration stage, [29][30][31] which is a typical diffusion process in which the grout (and grains) moves forward into the soil (porous medium) after the tail void has been filled with the main grout body and involves the interaction influence between the grout and soil. 32 However, in the calculation of the radial pressure and the diffusion radius, the initial pressure value is determined empirically or taken as the initial grouting outlet pressure under the assumption that grout diffusion into soil occurs after the tail void is fully filled.…”

Section: Introductionmentioning

confidence: 99%

A semi‐elliptical surface compound diffusion model for synchronous grouting filling stage in specially shaped shield tunnelling

Liu

Shi

et al. 2021

Num Anal Meth Geomechanics

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In constructing super-large section shield tunnels, it is difficult to guarantee the filling efficiency and uniformity of grouting behind the segments. Studies on grout diffusion models often simplify the grout filling process, leading to inaccurate results, especially for shield tail void with special noncircular profiles. This paper presents a theoretical study on the grout filling diffusion mechanism and its mechanical behaviour, with a particular focus on the grout actual motion process at the synchronous grouting filling stage when the shield is advancing. A semi-elliptical surface compound diffusion model without the predetermined flowing passage was developed, and this model was used to derive the grout filling pressure and diffusion distance formulas. To address the time-varying diffusion surface and irregular integral region issues in derived equations, a stepwise solution algorithm based on the spatiotemporal discretisation operation was proposed. Finally, the grout pressure distribution patterns and some critical influence factors were analysed using a case study in the soft silty clay area to compare the presence and absence of circumferential-longitudinal correlations in the grout filling diffusion process. The results show that the diffusion mechanical behaviour and force transmission significantly affected the total and per-unitarea grout pressures, and the proposed theoretical model is more consistent with the field-measured data. The local trend and fluctuation characteristics of grout filling pressure are clearly different from those of a circular tunnel. The grout filling diffusion mechanism was determined to be the main cause of pressure distribution changes under the premise of a certain initial grouting pressure.

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“…In addition to different diffusion geometry, Liang et al. (2017) 33 proposed grout diffusion models in the circumferential and longitudinal directions of tunnel segment lining. In the study presented by Liang et al.…”

Section: Introductionmentioning

confidence: 99%

“…In the study presented by Liang et al. (2017), 33 longitudinal diffusion was highlighted by assuming the grout could fill up an annular void at a very short time period. However, the radial grout diffusion around tunnel segment is much more important than longitudinal diffusion.…”

Section: Introductionmentioning

confidence: 99%

A diffusion model for backfill grout behind shield tunnel lining

Liu

Shen

et al. 2020

Num Anal Meth Geomechanics

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This paper presents an analytical model to investigate backfill grout diffusion behind tunnel segmental lining, in which the backfill grout is taken as a Bingham fluid. The analytical model of grout diffusion is derived based on force–equilibrium principle, Darcy's law, and the law of momentum conservation of the grout. Time‐dependent grout diffusion pressure and distance are highlighted in the model. The proposed grout diffusion model is applied in two field cases: Metro Lines No. 9 and No. 4 in Shanghai City. The results show that the proposed model agrees well with the measured grout diffusion distance in the field. Parametric studies are then conducted, implying that grout diffusion distance along the radial direction of tunnel lining is proportional to either hydraulic conductivity or initial grout pressure, whereas it is in inverse proportion to the yield stress of backfill grout. The distributions of initial grout pressure exert key influences on the grout diffusion distance and grout diffusion pressure behind tunnel segment lining.

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Temporal and spatial distribution of the grout pressure and its effects on lining segments during synchronous grouting in shield tunnelling

Cited by 26 publications

References 9 publications

Study on the Floating of Large Diameter Underwater Shield Tunnel Caused by Synchronous Grouting

Study on the Floating of Large Diameter Underwater Shield Tunnel Caused by Synchronous Grouting

A semi‐elliptical surface compound diffusion model for synchronous grouting filling stage in specially shaped shield tunnelling

A diffusion model for backfill grout behind shield tunnel lining

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