Mechanism and preventive measures of slurry leakage at shield tail brushes under abnormal shutdown condition—A case study

Ye, Fei; Feng, Haolan; Han, Xingbo; Xiaoming, Liang; Sun, Huiyu; Zhang, Wenjun; Cao, Xiaoyong

doi:10.1016/j.undsp.2022.03.003

Cited by 6 publications

(1 citation statement)

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“…The continuously formed filter cakes maintain the stability of the tunnel face during the tunnelling process. Otherwise, tunnelling instability could lead to severe ground collapse incidents, ───── inevitably resulting in catastrophic damage to nearby infrastructure [4][5]. Hence, the study of the tunnelling stability of SPBS and the mechanism of ground collapse is crucial for disaster prevention in tunnel engineering.…”

Section: Introductionmentioning

confidence: 99%

Unstable collapse analysis of SPBS in saturated sand based on model experiment

Li,

Wu,

Chen

et al. 2024

Preprint

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The instability of the tunnel face during shield tunnelling can lead to extensive surface subsidence in saturated sand, potentially leading to ground collapse accidents that pose a serious threat to the safety of surface infrastructure. In order to study the mechanism of ground collapse induced by face instability, a laboratory-scale slurry pressure balance shield (SPBS) machine system is employed to simulate the entire process of tunnelling. The soil pressure, pore water pressure, and surface subsidence response during unstable are revealed through multi-field monitoring. The morphological evolution characteristics of collapse pits are analyzed using 3D scanning technology. The experimental results indicate that: (1) The key to stable tunnelling is to balance the pressure in slurry chamber with tunnelling speed, which ensures the formation of filter cake in front of the cutterhead. (2) The torque of the cutterhead, soil pressure, and surface subsidence will respond significantly and synchronously when the tunnel face is unstable, whereas the soil and water pressures are relatively less noticeable. (3) Continuous tunnelling results in a gentler angle of repose and a wider range of collapse of the collapsed pit in the longitudinal direction. (4) The formula for predicting the duration of collapse is proposed which integrates the evolution patterns of the collapse pit effectively and has been well-validated by comparison with these experimental results. The study provides a reference for the safe construction of tunnel engineering in saturated sand.

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Section: Introductionmentioning

confidence: 99%