Half-spherical surface diffusion model of shield tunnel back-fill grouting based on infiltration effect

Ye, Fei; Yang, Tao; Mao, Jiahua; Xianzhuo, Qin; Zhao, Ruliang

doi:10.1016/j.tust.2018.10.004

Cited by 60 publications

(18 citation statements)

References 17 publications

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“…When curing time is more than 3 d, permeability coefficient of the grouted body is less than 3 × 10 − 10 cm/s. Applicable conditions of equations (7) and (8) are as follows: firstly, the sand layer is absolutely injectable; secondly, water-cement ratio of slurry is in the range of 0.8 to 1.6; and thirdly, curing time of the grouted body of the sand layer is in the range of 1 d to 28 d.…”

Section: Relationship Between 3 D Compressive Strength 3 D Deformatimentioning

confidence: 99%

“…Many research studies have been done in aspect of permeation grouting in the sand layer. Yang et al [5], Yang et al [6], and Ye et al [7] have established a theoretical model for permeation grouting considering time-dependent behavior of slurry viscosity, based on different fluid constitutive models (Newton model, Bingham model, and power law model). Zhang et al [8] and Ye et al [9] have developed the permeation grouting theoretical model for quick setting slurry, considering inhomogeneous distribution of slurry viscosity in the grouting area.…”

Section: Introductionmentioning

confidence: 99%

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Research on Influence of Water‐Cement Ratio on Reinforcement Effect for Permeation Grouting in Sand Layer

Zhang

Chu

et al. 2020

Advances in Materials Science and Engineering

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In order to study permeation grouting reinforcement effect in the sand layer, a set of grouting test device is developed, which consists of a power device, a pressure-bearing slurry tank, and several test frames. Compressive strength, deformation modulus, and permeability coefficient are selected to be the evaluation index of grouting reinforcement effect. Grouting reinforcement effect under different water-cement ratio of cement slurry and curing time were measured. Eventually, under laboratory conditions, fitting formulas have been obtained which describe the quantitative relationship between reinforcement effect of permeation grouting and water-cement ratio and curing time. Results show that water-cement ratio of slurry has obvious effect on grouting reinforcement effect. Mechanical performance and impermeability of the grouted body are negative-correlated with water-cement ratio. There are two different destruction patterns for the grouted body in uniaxial compression process: global destruction pattern at low water-cement ratio and local destruction pattern at high water-cement ratio. If cement slurry at high water-cement ratio is permeated into the sand layer, water bleeding phenomena will appear and lead to inhomogeneous performance of the grouted body, with lower performance in the upper part and higher performance in the lower part of the grouted body.

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Section: Relationship Between 3 D Compressive Strength 3 D Deformatimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Influence of Water‐Cement Ratio on Reinforcement Effect for Permeation Grouting in Sand Layer

Zhang

Chu

et al. 2020

Advances in Materials Science and Engineering

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“…The grout diffusion into soil dissipates initial grout injection pressure, but it will expand the surrounding region with the movement of pressurized grout, imposing the external force to adjacent buildings 20 . Regarding issues (iii) and (iv), clearly the pressurized grout diffusing into the soil moves the interface of soil and grout, the pressure acting on this interface is decreased along with the grout movement 21 . This implies that grout diffusion into soil significantly affects the dissipation of initial grout injection pressure.…”

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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“…erefore, it is of great concern to estimate the magnitude of expected ground displacements before tunnel construction [33]. At present, there are only a few investigations relating to the grouting-induced response during shield tunnelling [34][35][36][37][38]. Komiya et al [34] investigated the effectiveness of grouting to reduce surface settlements caused by shield tunnelling in clayey soil based on the laboratory tests and a field case history.…”

Section: Introductionmentioning

confidence: 99%

“…Farrell [37] reported a case history to mitigate the tunneling-induced settlement by the use of compensation grouting in London. Ye et al [38] developed a half-spherical surface diffusion model to describe the infiltration effect of grouting during shield tunnelling. However, it is difficult to find out an available method to quantitatively evaluate the ground movements caused by grouting during shield tunnelling.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of Ground Movements Caused by Grouting during Shield Tunnelling in Clay

Wang

Cheng

Wang

2019

Advances in Civil Engineering

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Grouting has been deemed as one of the most effective measures for mitigation of ground movements during tunnel construction in soft soil. Notwithstanding that, a reliable measure to quantitatively evaluate the grouting-induced ground movements during shield tunnelling in soft soil has not yet been developed. This paper presents a simple method capable of quantitatively estimating the ground movements associated with grouting for tunnel-boring operations where the grouting parameters and soil properties are taken into consideration. The grouting process is simplified as the expansion of a cylindrical cavity with a uniform radial stress applied at soil-grout interface in a half plane, and the analytical solution proposed by Verruijt is introduced for determining the ground movements by the expansion of the cylindrical cavity. The proposed method is verified with a case history undertaken in London Clay. The results obtained suggest that this procedure would be helpful in managing the grouting parameters adopted in upcoming soft ground tunnelling project and mitigating the environmental impacts on nearby properties.

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Half-spherical surface diffusion model of shield tunnel back-fill grouting based on infiltration effect

Cited by 60 publications

References 17 publications

Research on Influence of Water‐Cement Ratio on Reinforcement Effect for Permeation Grouting in Sand Layer

Research on Influence of Water‐Cement Ratio on Reinforcement Effect for Permeation Grouting in Sand Layer

A diffusion model for backfill grout behind shield tunnel lining

Quantitative Evaluation of Ground Movements Caused by Grouting during Shield Tunnelling in Clay

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