Optimization of Grouting Material for Shield Tunnel Antifloating in Full-Face Rock Stratum in Nanchang Metro Construction in China

Jiang, Yalong; Xu, Zhen-zhen; Geng, Daxin; Dong, Jicheng; Liao, Y.S. Hu X.H.

doi:10.1061/(asce)gm.1943-5622.0002312

Cited by 15 publications

(2 citation statements)

References 33 publications

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“…In different engineering contexts, the requirements for the physical properties and mechanical properties of the grouting fluid vary greatly [42][43][44]. Therefore, the grouting solution should be designed with modified materials according to the project needs, and if possible, intelligent machine technology should be combined with grouting technology to improve the grouting effect.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study on Performance of Modified Cement-Based Building Materials under High-Water-Pressure Surrounding Rock Environment

et al. 2023

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Traditional cement-based grouting materials have good reinforcement and anti-seepage effects on the surrounding rock under normal conditions, but the grouting effect is not ideal due to problems such as a long setting time, a low stone ratio, and poor crack resistance under high water pressure and in a dynamic water environment. In this study, we aimed to improve the physical properties, chemical properties, and microstructure of a cement-based slurry by forming a hydrogel through its chemical crosslinking with polyvinyl alcohol and boric acid as modifiers for the purpose of improving the permeability resistance of the surrounding rock grouting under high-water-pressure conditions, which can expand the function of traditional building materials. The grouting effect of the modified cementitious material on the surrounding rock was analyzed through indoor tests, the SEM testing of the performance of the modified slurry, the numerical calculation of the seepage field, and the application of the modified slurry in combination with the actual project to verify the water-plugging effect. The research findings demonstrate that (1) the additives boric acid and PVA can significantly speed up the slurry gel time, and the gel time can be controlled within 2–20 min to meet the specification requirements. (2) At a velocity of moving water > 1 m/s, the retention of the solidified modified slurry stone body reaches more than 80%. According to the SEM analysis, the structure of the solidified modified slurry stone body is dense and has good impermeability. (3) According to the numerical calculation analysis, the modified slurry can effectively change the seepage field of the surrounding rock and improve its seepage resistance. The water pressure outside the lining is reduced by 47%, 31%, and 22%, respectively, compared with no slurry, the pure cement slurry, and cement–water-glass grouting, and the indoor test and numerical simulation conclusions are consistent.

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Section: Discussionmentioning

confidence: 99%

Experimental Study on Performance of Modified Cement-Based Building Materials under High-Water-Pressure Surrounding Rock Environment

et al. 2023

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“…Secondly, if there are pores in the grouting area, especially if there is pore water flow, the grout will be washed away, which will not achieve the grouting effect, and the washed away grout will also pollute the downstream water body; and thirdly, the high water-cement ratio causes a very long curing time for condensation, which affects the construction efficiency. Therefore, a grouting material that can control the viscosity and setting time of the grout is of particular importance [4].…”

Section: Introductionmentioning

confidence: 99%

Study of New Materials for Controlled Grouting Reinforcement

Ding,

Ren,

et al. 2023

Advances in Transdisciplinary Engineering

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In practice, wet and submerged repair and reinforcement is often encountered, such as damage to tunnels due to wear and tear and water erosion, leakage in concrete diversion channels, etc. Due to the presence of large amounts of water in the environment, it is very difficult to achieve dry conditions for repair and reinforcement of such structures, which often requires wet or submerged construction. In addition, dams are subject to cracks and surface peeling in submerged concrete or reinforced concrete due to the complex environment they have been in for a long time, and concrete is also subject to pressure water due to dam storage. Conventional repair materials pursue high groutability, good flowability of the slurry but it is extremely easy to disperse when it encounters water scouring, failing to achieve the effect of grouting, wasting material seriously and washing away lost material will also cause pollution to the environment. As the mountain is relatively fragmented, the grouting process consumes a large amount of grout, so it is necessary to keep the grouting within certain limits. Therefore, the specific grouting construction conditions also place special requirements on the grouting material, towards the need for grouting material to meet the premise of groutability and mechanical properties, but also the need to meet the construction requirements of underwater or moving water conditions, as well as the control requirements of the grout flow range. This paper introduces a controlled grouting material which, by regulating the setting time and viscosity of the material, allows the grouting material to be well adapted to grouting under local subsurface moving water conditions.

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Fire prevention and extinguishing technologies in coal spontaneous combustion: a bibliometric and systematic review

Hu,

Zhu,

Xie

et al. 2024

J Therm Anal Calorim

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Optimization of Grouting Material for Shield Tunnel Antifloating in Full-Face Rock Stratum in Nanchang Metro Construction in China

Cited by 15 publications

References 33 publications

Experimental Study on Performance of Modified Cement-Based Building Materials under High-Water-Pressure Surrounding Rock Environment

Experimental Study on Performance of Modified Cement-Based Building Materials under High-Water-Pressure Surrounding Rock Environment

Study of New Materials for Controlled Grouting Reinforcement

Fire prevention and extinguishing technologies in coal spontaneous combustion: a bibliometric and systematic review

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