Numerical Study on Backfilling the Tail Void Using a Two-Component Grout

Shah, Ravi; Lavasan, Arash Alimardani; Peila, Daniele; Todaro, Carmine; Luciani, Andrea; Schanz, Tom

doi:10.1061/(asce)mt.1943-5533.0002175

Cited by 52 publications

(13 citation statements)

References 12 publications

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“…e grouting situation and scope of the shield tail gap were very complex. Hence, they are equivalent to elastic, equal 10 Advances in Civil Engineering thickness, and uniform equivalent layer [34][35][36], which was modeled as the elastic solid element with a thickness of 14 cm. e numerical calculation parameters of various structures are shown in Table 7.…”

Section: Numerical Modelmentioning

confidence: 99%

Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large‐Section Mining Tunnel

Zhang

Yan

et al. 2020

Advances in Civil Engineering

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Due to the increasingly expanding of urban rail transit, shield tunnelling adjacent to existing tunnels has become more and more common in cities. Construction of new tunnels will pose great risks to the safety of existing tunnels. This paper focused on the influence of shield tunnelling on the large-section mining tunnel in the argillaceous siltstone stratum and proposed the influence zone based on the surface subsidence criterion. By carrying out numerical simulations and model test, the surface subsidence, the internal force of the mining tunnel, and the surrounding rock pressure were monitored and the accuracy of the influence zone was verified. The research shows that the shield machine tunnels forward from one time the excavation diameter before the monitoring section until the monitoring section completes the segment assembly. This process is the main stage that causes the increase in the corresponding surface settlement and the additional displacement of the existing mining tunnel. The excavating tunnel influences on the mining tunnel structure were mainly shown at the vertical additional deformation, which is manifested as the overall floating of the mining tunnel. The influence of internal force was performed as the asymmetric change of internal force of the mining tunnel. The mining tunnel is closer to the shield tunnel, showing more significant changes of the internal force of the structures. The structure near the shield tunnel is strengthened by pressure, and the structure far away from the shield tunnel is more prone to tensile failure.

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Section: Numerical Modelmentioning

confidence: 99%

Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large‐Section Mining Tunnel

Zhang

Yan

et al. 2020

Advances in Civil Engineering

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“…Synchronous grouting is a necessary and key process for shield tunneling. Grouting material is pressed into the void at the end of the shield to prevent segment ruptured due to uneven force [ 1 , 2 ] ( Figure 1 ). Various types of synchronous grouting materials have been studied to meet the needs of different construction [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of High Performance Synchronous Grouting Materials Prepared with Clay

Cui

Tan

2021

Materials

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Shield construction discharges a large amount of soil and muck. The utilization of discharged soil of shield always has high energy consumption and a low utilization rate. Meanwhile, synchronous grouting is a key process for shield tunneling. The current studies show that the synchronous grouting materials applied now generally have the problem of mismatching among filling property, fluidity, and consolidation strength. In order to study the feasibility of using the excavated soil produced by shield construction in clay stratum as synchronous grouting material, high performance synchronous grouting material was studied by taking red clay as an example, modified by epoxy resin. The fluidity, stability, and strength were measured to evaluate performance of the grout. Material test results show that the addition of waterborne epoxy resin decreases density, improves the stability, the rate of stone, and the toughness of the grouting concretion. Finally, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) were measured to analyze the cementitious mechanism of the grout, test results demonstrated that cement hydration and curing reaction of epoxy resin happened in the grout, the formed polymer film filled the voids in the mixture and effectively bound cement hydration gel and clay particles together.

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“…The tail void of a shield tunnel is an available space for installation of the segmental lining 8–10 . However, the tail void with thickness of up to 20 cm may lead to significant surface settlement 11–13 . At present, synchronous backfill grout is employed as an effective solution to fill up the tail void of shield tunnel 14,15 .…”

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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Numerical Study on Backfilling the Tail Void Using a Two-Component Grout

Cited by 52 publications

References 12 publications

Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large‐Section Mining Tunnel

Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large‐Section Mining Tunnel

Experimental Study of High Performance Synchronous Grouting Materials Prepared with Clay

A diffusion model for backfill grout behind shield tunnel lining

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