Study on Mudcake disintegration in clayey strata during shield tunneling: Effects of dispersants and bentonite slurry

Liu, Pengfei; Yang, Zhao; Ji, Fuquan; Chen, Peishuai; Hu, Qinxin; He, Xiong

doi:10.1016/j.heliyon.2024.e30663

Heliyon

2024

DOI: 10.1016/j.heliyon.2024.e30663

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Study on Mudcake disintegration in clayey strata during shield tunneling: Effects of dispersants and bentonite slurry

Pengfei Liu,

Zhao Yang,

Fuquan Ji

et al.

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2024

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Cited by 2 publications

References 27 publications

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Prediction of mud cake formation for shield tunneling based on cutterhead opening parameters

Rong,

Wang,

Han

et al. 2024

Applied Mathematics and Nonlinear Sciences

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During the shield tunneling, mud cake is one of the most common causes of cutterhead failure. Mud cake formation is a typical nonlinear process. Although the mud cake may block partial or all of the cutterhead opening, the relationship between mud cake and opening parameters has not been investigated. In this study, a prediction model of mud cake formation based on cutterhead opening is developed. The shapes of central and peripheral opening are quantified by central angle, central length, average peripheral width and standard deviation. The geological type is considered as another input parameter. A dataset of 151 real shield machines is normalized. The state of mud cake is labeled to train a model based on support vector machine (SVM). The proposed model is validated against the dataset and three other engineering cases in varied cities. Mutual relationship between mud cake and opening parameters is also investigated. It is shown that opening parameters play important roles in mud cake formation. Increasing central opening angle is an effective method to avoid mud caking. The risk of mud cake is rather small for the central angle larger than 80°. For higher length of central opening, the central angle can be even smaller. By checking the opening parameters, the risk of mud cake can be reduced before actual excavation.

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Prediction of mud cake formation for shield tunneling based on cutterhead opening parameters

Rong,

Wang,

Han

et al. 2024

Applied Mathematics and Nonlinear Sciences

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Experimental Study on the Effect of Temperature on the Characteristics of Cutterhead Mud Cake in Complex Red-Bed Geology

Yan,

Xue,

Xue

et al. 2024

Coatings

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Mud caking on shield cutterhead is a critical issue for tunnel safety, and temperature and duration are factors that can affect the characteristics of mud cake. Therefore, the aim of this study is to explore the characteristics of different temperatures and action times on the adhesion and hardness of red-bed geological mud cake. A self-designed experimental apparatus was used to simulate the adhesion of mud cake on the cutterhead. The adhesion and hardness of the mud cake were analyzed through mud cake shedding tests and hardness tests. In addition, water film theory is used to analyze the adhesion mechanism of the mud cake. The results indicate that temperature and duration are key factors affecting mud cake shedding. Within the range of 25~150 °C, mud cake shedding efficiency is positively correlated with temperature and duration. However, temperatures above 150 °C promote the sintering of the mud cake, reducing its shedding efficiency. The hardness of the mud cake increases with temperatures above 150 °C, where the mud cake hardens and sinters, increasing the difficulty of shield tunneling. The water content of mud cake is influenced by temperature and time, affecting the amount of mud cake shedding. As the water content increases, the shedding initially decreases and then increases, reaching its minimum at about 30%, where the adhesion is strongest. By controlling the temperature and time, the water content can be optimized, improving the handling of mud cake.

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Study on Mudcake disintegration in clayey strata during shield tunneling: Effects of dispersants and bentonite slurry

Cited by 2 publications

References 27 publications

Prediction of mud cake formation for shield tunneling based on cutterhead opening parameters

Prediction of mud cake formation for shield tunneling based on cutterhead opening parameters

Experimental Study on the Effect of Temperature on the Characteristics of Cutterhead Mud Cake in Complex Red-Bed Geology

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