Assessment and structural improvement on the performance of soil chamber system of EPB shield assisted with DEM modeling

Zhu, Hehua; Cheng, Panpan; Xiaoying, Zhuang; Li, Yuanhai; Li, Peinan

doi:10.1016/j.tust.2019.103092

Cited by 26 publications

(6 citation statements)

References 15 publications

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“…For simplification, the spherical particle was adopted to describe the strength properties and fluidity of the actual soil [21,22]. In this study, to characterize the adhesion among the conditioned soil grains, the Hertz-Mindlin (H-M) with the Johnson-Kendall-Roberts (JKR) model was chosen for inter-particle contact behavior [23].…”

Section: Parameter Calibrationmentioning

confidence: 99%

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

et al. 2023

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Based on a cross-river tunnel of Wuhan Metro Line 8, we present a two-dimensional discrete element model for shield attitude adjustment considering the effect of overbreak cutters. The shield shell mechanics under the influence of over-excavation rate, over-excavation orientations, and overburden load are simulated, and the tunneling mechanics law and the ultimate range during the adjustment of the shield attitude are investigated. The simulation results indicate the following: (1) The greater the over-excavation rate, the smaller the force exerted by the soil layer in the negative direction of the shield movement; therefore, increasing the over-excavation rate is helpful in expanding the range of shield attitude adjustment. (2) The shield is stressed symmetrically while conducting positive and negative horizontal adjustments in the soil layer, which has a symmetrical distribution, but vertical upward adjustment is more difficult than vertical downward adjustment. (3) With the increase in overburden load, the space of the shield attitude adjustment is gradually reduced at the same over-excavation rate. A good engineering application was achieved in this project using the simulation model. It is recommended to use the attitude adjustment method by controlling the tunneling parameters. In difficult situations such as high overlying loads, the over-excavation cutter can be used to assist in adjusting the shield attitude.

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Section: Parameter Calibrationmentioning

confidence: 99%

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

et al. 2023

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“…In the actual tunneling process, for the shield machine position trajectory control problem, relying only on manual experience to adjust the position parameters has great uncertainty. With the rapidly developing technologies such as artificial intelligence, big data and control theory, and other technologies, how to predict and control the tunneling parameters for shield machines scientifically has attracted the attention of scholars [5][6][7][8]. Wang P et al [9].…”

Section: Introductionmentioning

confidence: 99%

Intelligent real-time prediction for shield machine position on the basis of BWO-LSTM-GRU

Xuanyu,

Mengting,

Wenshuai

et al. 2024

Eng. Res. Express

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Due to the complexity and variability of shield machine working environment, it is very important to accurately control and regulate the position trajectory of shield machine. For that reason, an intelligent real-time prediction model of shield machine position based on BWO-LSTM-GRU (Beluga whale optimization-Long Short-term Memory-Gated recurrent unit) is proposed in this paper. Firstly, the real-time data of shield machine are processed based on Pearson correlation analysis, and the tunneling parameters presenting medium-strong correlation with the position parameters are filtered to obtain, which were used to be input variables for prediction models. Secondly, LSTM-GRU position prediction model was established separately for shield machine position parameters, and four hyperparameters of the model were optimized separately using BWO. Finally, BWO-LSTM-GRU position prediction models are used to realize the intelligent real-time prediction of the motion trajectories at four positions for shield machine. The simulation results indicate that the prediction deviation in the position prediction model is within 3 mm, and it can accurately complete the task of real-time prediction, providing real-time data support for shield machine drivers.

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“…Relying on a tunnel project in Fuzhou, Wang, S.M [37] carried out a study on the construction of an earth pressure shield machine in high permeability and high-pressure formation by using nano bentonite CMC as the muck improver, and they evaluated the effect of this soil improver through field tests. Zhu H. H and others [38][39][40][41] evaluated the stability of the earth pressure shield in the sandy gravel stratum by establishing the DEM model, and proposed measures to improve the fluidity and wear resistance. Zhao S. S. [36] discussed the effect of adding dispersant in mud on controlling clay cake, and verified the effectiveness of the dispersant in reducing viscosity through laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

Research and Experimental Application of New Slurry Proportioning for Slag Improvement of EPB Shield Crossing Sand and Gravel Layer

Sun

Zhao

2022

Coatings

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Based on the construction practice of the Beijing Metro Line 10 shield tunneling project, this paper describes research on soil improvement technology for Beijing stratum characteristics (sandy gravel stratum) and covers similar engineering conditions. It also describes the development of a new type of mud improver. Based on the laboratory tests with bentonite as the base mud and different additives, the effects of guar gum, CMC, xanthan gum, and clay medium particles on mud performance are analyzed. Then, two kinds of mud were used to conduct indoor simulated muck improvement tests (mixing test, slump test, sliding plate test, and adhesion resistance test), and the improvement effects of new mud and ordinary mud applied in pebble/round gravel and sandy soil layers were compared. The results show that xanthan gum is the best material to improve the performance of slurry, using the contrast test of bentonite-based slurry and different additives. The optimum slurry preparation scheme is 4% bentonite, 0.2% xanthan gum, 0.04% soda ash, and 1% clay particles. Using indoor simulated muck improvement tests (mixing test, slump test, slide plate test, and adhesion resistance test), the improvement effects of applying new mud and ordinary mud in pebble/round gravel and sandy soil layers are compared, and the advantages of the new mud in the application of the above two formations are verified. Among them, the new slurry has great advantages for improving the two parameters of the soil adhesion resistance coefficient and slump during shield tunneling. When the improved soil mass reaches the flowing plastic state, the proportion of new mud added to different soil mass is different. The proportion of new mud added to improved pebble/pebble soil is 28%, and that of sand and clay is 32%. It can be seen that new mud is more suitable for improving pebble/pebble soil.

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Assessment and structural improvement on the performance of soil chamber system of EPB shield assisted with DEM modeling

Cited by 26 publications

References 15 publications

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

Intelligent real-time prediction for shield machine position on the basis of BWO-LSTM-GRU

Research and Experimental Application of New Slurry Proportioning for Slag Improvement of EPB Shield Crossing Sand and Gravel Layer

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