Experimental study and engineering application of slurry permeability mechanism of slurry shield in circular-gravel stratum

Liu, Dongshuang; Liu, Xinrong; Lin, Chengqian; Xiong, Fei; Han, Yafeng; Meng, Qing‐Jun; Zhong, Zuliang; Chen, Qiang; Weng, Chengxian

doi:10.1007/s12517-020-05731-x

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Ref. reference [ 33 ] uses a self-designed grout penetration device to carry out the cake forming experiment of different grout ratios in circular gravel stratum, to study the influence of grout-specific gravity, viscosity, and grouting pressure on infiltration water amount and cake forming time, so as to achieve the best state of filter cakes. Similarly, reference [ 34 ] studied the effect of seawater intrusion on slurry and filter cake properties during shield construction of undersea tunnel by laboratory experiment.…”

Section: Literature Reviewmentioning

confidence: 99%

AHP‐FSE‐Based Risk Assessment and Mitigation for Slurry Balancing Shield Tunnel Construction

Xiahou

Hong

et al. 2022

Journal of Environmental and Public Health

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Slurry balancing shield construction is a method in which slurry pressure and groundwater pressure are balanced to achieve stability of excavation working face. It is widely used in tunnel construction due to its safety and high-efficiency characteristics. At present, research on safety risk management of slurry balancing shield construction is relatively lacking, and most scholars still mainly focus on technical research. In this paper, based on system engineering theory and from the perspective of whole construction process, a comprehensive evaluation index system for shield construction risk analysis is built by taking “human-machine-material-method-environment” as assessment dimensions. This paper modifies the existing analytic hierarchy process (AHP), combines AHP with fuzzy synthetic evaluation to build a risk analysis model, and quantifies the construction risk by evaluation set and matrix. Combined with case study, the effectiveness of the proposed model is verified, and measures to mitigate safety risks of slurry shield construction are proposed from perspectives of management, economy, and technology. This paper evaluates the overall risk level of project from a systematic perspective, which is an extension of traditional technology-oriented research.

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Section: Literature Reviewmentioning

confidence: 99%

AHP‐FSE‐Based Risk Assessment and Mitigation for Slurry Balancing Shield Tunnel Construction

Xiahou

Hong

et al. 2022

Journal of Environmental and Public Health

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“…The previously developed device can only simulate the static filter cake [29,32,36,39]. This was based on the slurry infiltration principle of the slurry shield machine, the balance between compressed air, slurry in the slurry chamber, and the water and earth pressure, as shown in Figure 5.…”

Section: Experiments Systemmentioning

confidence: 99%

Experimental Study on the Characteristics and Formation Mechanism of Dynamic Filter Cake for Slurry Shield Tunneling

et al. 2022

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The key to guaranteeing excavation face stability in slurry shield tunneling is the formation of an impermeable dynamic filter cake. At the same time, the effect of the cutter head and rotation speed should be taken into account. We studied the characteristics and formation mechanism of the dynamic filter cake using a newly developed experimental apparatus. The experiment results show that the hysteretic infiltration zone appeared in the curves of stepped loading filtration while the cutter head was rotating, and the volume of water filtration increased by 11.2% compared to when the cutter head stopped. The higher the rotation speed was, the lower the conversion rate of the effective stress was. Under the same rotation speed, the formation time of the 6-cutter arm was almost 5 s slower than that of the 5-cutter arm. As the cutter arms and the rotation speed increased, the stratum’s electrical conductivity increased and stabilized at a distance of 20 cm from the cutter head. The filter cake transited from ‘filter cake plus an infiltration zone’ to ‘an infiltration zone without a filter cake’ with the increase of the rotation speed. The thickness of the dynamic filter cake was smaller than that of the static filter cake, the thickness of 10 groups decreased significantly, and the average thickness decreased by 76.15% at 1.0 rpm. The mesoscopic formation process of the dynamic filter cake can be divided into six stages. This study revealed the slurry penetration mechanism and filter cake characteristics present under cyclic damage by the shield cutter head to the filter cake and soil and provided theoretical support on how to maintain the stability of the excavation face during slurry shield tunneling.

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“…Wang et al [16] conducted a simulation test on the stability of the excavation surface of the subsea tunnel and found that by increasing the clay content in the mud slurry and the viscosity of the mud slurry, a better quality mud cake can be formed, and the amount of mud slurry required to form the mud cake can be effectively reduced. Liu et al [17] carried out permeation film forming experiments of different ratios of slurry in circular-gravel stratum to study the effects of slurry specific gravity, viscosity, and grouting pressure on amount of infiltrated water, film-forming time, and slurry film shape. e research found that the higher the slurry specific gravity is, the better the mud cake quality is.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large‐Diameter Slurry Shield Tunneling

Kou

Zhao

Lian

et al. 2021

Advances in Civil Engineering

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Multiple soil layers may be exposed simultaneously on the excavated surface of a large-diameter slurry shield. To study the formation and characteristics of mud filtration cake on the excavation surface during large-diameter slurry shield tunneling, penetration tests of mud slurries in different soils were carried out using a self-made device, and the microstructures of different mud filtration cakes were observed using scanning electron microscopy. The test results showed that there were three categories of filling forms for mud slurries permeating the soils: mud filtration cake, mud cake + permeation zone, and permeation zone; correspondingly, there were three types of filtration loss, which was mainly affected by the specific gravity of mud slurry. Finally, the porosity and the fractal dimension for the pore area of the mud filtration cake were calculated, and it is found that the fractal dimension of pore area is beneficial to classify the type of mud filtration cake.

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Experimental study and engineering application of slurry permeability mechanism of slurry shield in circular-gravel stratum

Cited by 7 publications

References 16 publications

AHP‐FSE‐Based Risk Assessment and Mitigation for Slurry Balancing Shield Tunnel Construction

AHP‐FSE‐Based Risk Assessment and Mitigation for Slurry Balancing Shield Tunnel Construction

Experimental Study on the Characteristics and Formation Mechanism of Dynamic Filter Cake for Slurry Shield Tunneling

Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large‐Diameter Slurry Shield Tunneling

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