Analysis of Soil Disturbance by Shield Tunneling

Xu, Min; Zhao, De Shen

doi:10.4028/www.scientific.net/amr.734-737.502

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…Figures 18 and 19, respectively, showed the bending moments and the axial forces at different circumferential positions of segments of left and right tunnels under successive excavation of double shield tunnels, in which the left and right tunnels denoted the left and right excavation tunnels, respectively. From Figure 18, it can be found that for the sake of the secondary disturbance to the soil caused by the excavation of the right tunnel [30], the magnitudes and locations of the maximum positive and negative bending moments of the segments of the left and right tunnels were different. The maximum positive and negative bending moments of the left tunnel were 87.64 kN•m and −88.56 kN•m, respectively, while the maximum positive and negative bending moments of the right tunnel were 74.01 kN•m and −77.68 kN•m, respectively.…”

Section: Internal Forces Of Segmentmentioning

confidence: 99%

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Lou

Huang

2023

Applied Sciences

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Research on tunnel excavation has rarely considered the effect of the tunnel excavation on a complete building. Therefore, this paper considered a building with a double basement and piles, and a three-dimensional finite-element model for shield tunnels undercrossing an existing building was established to study the effects of the excavation of double-shield tunnels on the displacement and internal forces of soil, segments, piles, and buildings. Grouting reinforcement technology was used in the model to analyze the effect of grouting reinforcement on pile displacement and building subsidence. The results showed that for every 100 kPa increase in grouting pressure, the maximum subsidence of the soil was reduced by 3.512 mm. The successive excavation of double-shield tunnels resulted in elliptical segments. The longitudinal and transverse stresses of the segments were effectively reduced by grouting pressure of 250 kPa. The excavation of tunnels had an obvious nonlinear effect on the maximum lateral displacement of the piles along the direction of excavation and the maximum subsidence of the building. When using deep-hole grouting reinforcement, the maximum lateral displacement of piles and the maximum subsidence of the building were effectively reduced by increasing the radial grouting reinforcement radius and adjusting the reinforcement range.

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Section: Internal Forces Of Segmentmentioning

confidence: 99%

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Lou

Huang

2023

Applied Sciences

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“…The multitude of tunneling parameters exhibit varying degrees of correlation influenced by environmental factors and human operations [3]. Establishing judicious shield tunneling parameters effectively addresses challenges such as mud cake formation, tool wear, and mud stagnation during the tunneling process [4][5][6]. Given the plethora of tunneling parameters, the selection of crucial parameters, analysis of their fundamental behaviors, and understanding the distribution patterns under diverse environmental conditions are pivotal aspects of tunneling parameter analysis.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Shield Tunneling Parameters and Research on Prediction Model of Tunneling Excavation Speed in Volcanic Ash Strata of Jakarta–Bandung High-Speed Railway Project

Fan,

Tan,

Zhang

et al. 2024

Applied Sciences

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Insufficient investigations have been conducted on the analysis of shield tunneling parameters and the prediction of the tunneling excavation speed in formations composed of volcanic ash strata. To address this issue, we employ a comprehensive approach utilizing literature research, mathematical statistics, and other methodologies, centered on the analysis of the No. 1 Tunnel of the Jakarta–Bandung High-Speed Railway. Our focus is on examining the evolution patterns and inter-relationships of shield tunneling parameters within volcanic ash strata. Subsequently, we propose an optimized strategy for these tunneling parameters. By employing six machine-learning algorithms to construct prediction models, we compare and analyze their performance in predicting the tunneling excavation speed. The results indicate a positive correlation between slurry pressure and tunnel depth in volcanic ash strata, suggesting that the grouting pressure should exceed the slurry pressure by approximately 0.22 MPa. In the composite stratum of “volcanic ash debris + round gravel”, the cutter torque exhibits a strong negative correlation with the total thrust (−0.77). Due to tool wear and ground resistance, the excavation speed and cutter speed are weakly negatively correlated. Compared to other strata, shield tunneling in volcanic ash strata exhibits larger grouting pressure fluctuations, slower tunneling excavation speed, greater total thrust, higher cutter torque, and lower cutter speed. Regarding shield tunneling excavation speed prediction, the ranking of the algorithm performance is RF > DNN > ANN > BPNN > MNR > SVM, with RF achieving a decision coefficient of 0.829. The RF model is well-suited for predicting the shield structure tunneling excavation speed.

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Analysis of Soil Disturbance by Shield Tunneling

Cited by 2 publications

References 1 publication

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Analysis of Shield Tunnels Undercrossing an Existing Building and Tunnel Reinforcement Measures

Analysis of Shield Tunneling Parameters and Research on Prediction Model of Tunneling Excavation Speed in Volcanic Ash Strata of Jakarta–Bandung High-Speed Railway Project

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