Case Study on Tunnel Settlement Calculations during Construction Considering Shield Disturbance

Sun, Fuxue; Jin, Zhouzhou; Gou, Changfei; Li, Xiaochun; Cheng, Lu; Yu, Zheng

doi:10.1007/s12205-023-0925-z

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Consequently, there is a tendency for the strata to shrink towards the tunnel's interior. Additionally, a phenomenon known as unloading rebound occurs post-excavation at the tunnel's base, leading to the settlement of the arch roof and the upliftment of the tunnel floor slab [28].…”

Section: Effect Of Composite Strata Ratios On Settlementmentioning

confidence: 99%

Ground Deformation of Shield Tunneling through Composite Strata in Coastal Areas

Wu,

Xu,

Wang

et al. 2024

Buildings

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In order to mitigate ground deformation during shield construction in both upper soft and lower hard strata of coastal areas, a numerical simulation was executed. This simulation assessed surface deformation under varying stratum ratios, grouting pressures, and earth bin pressures. The evaluation was primarily based on the amount of ground deformation, which revealed that hard rock strata offer superior settlement control compared to soft rock strata. The excavation of the right tunnel line increased disturbance to the left line at higher stratum ratios. Surface deformation demonstrated a linear correlation with earth pressure, with 130 kPa identified as the optimal point. Higher pressures resulted in extrusion deformation and ground uplift. Grouting pressure had a minimal impact on stratum deformation over time. The stratum ratio exerted the most significant influence on settlement, followed by earth pressure, with grouting pressure having the least impact. In the context of coastal tunnel construction, hard rock excavation is favored. Earth pressure must be balanced to prevent subsidence or uplift, while excessive grouting pressure does not significantly reduce subsidence. Grouting pressure should ensure the complete filling of voids.

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Section: Effect Of Composite Strata Ratios On Settlementmentioning

confidence: 99%

Ground Deformation of Shield Tunneling through Composite Strata in Coastal Areas

Wu,

Xu,

Wang

et al. 2024

Buildings

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“…Surface settlement caused by shield excavation is affected by various factors, including soil loss, erosion, stress release, and soil consolidation 6 – 8 . Conventional research methods include empirical formula approaches 9 – 11 , numerical simulation techniques 12 – 15 , and model testing methods 16 – 19 . However, when complex construction factors and geological conditions are involved, these methods yield results that deviate significantly from observed data.…”

Section: Introductionmentioning

confidence: 99%

Prediction method of longitudinal surface settlement caused by double shield tunnelling based on deep learning

Shang,

Li,

Wei

et al. 2024

Sci Rep

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The deep learning method faces the challenges of small sample data and high dimensional shield operational parameters in predicting the longitudinal surface settlement caused by shield excavation. In this study, various optimization algorithms were compared, and the slime mould algorithm (SMA) was optimally chosen to optimize the hyperparameters of random forest (RF), and SMA-RF was used for dimensionality reduction and feature contribution analysis. A double-input deep neural network (D-DNN) framework was proposed for the prediction of surface settlement, which considers the influence of twin tunnels and effectively increases the high-fidelity data in the database. The results show that SMA performs best among various optimization algorithms; employing features that have a cumulative contribution value exceeding 90% as input can result in high prediction accuracy; there is significant uncertainty in the feature contribution analysis for small sample data; the reduced shield running parameters show a strong nonlinear relationship with surface settlement; compared with S-DNN, D-DNN takes into account the excavation of twin tunnels and expands the database capacity by more than 1.5 times, with an average increase of 27.85% in the R2 and an average decrease of 53.2% in the MAE.

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“…Many experts and scholars have achieved certain research results on the field application and engineering effects of double or multi-layer primary support structures in soft rock tunnels [9][10][11][12][13][14][15][16]. However, many studies mainly rely on field tests with high cost.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

Chen,

Ding,

Liu

et al. 2024

Period. Polytech. Civil Eng.

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Based on a soft rock tunnel in a mountainous area of northwest Yunnan Province, a refined numerical model of different support forms considering structural interaction is established to comprehensively evaluate the structural failure mechanisms and mechanical responses of different support forms. Research shows that compared to steel rib structures, the axial force and bending moment of sprayed concrete structures is larger under different combinations of support structures. Compared with a single-layer support structure, the stress distribution at each position of the double-layer I-shaped steel structure is more uniform, and the sprayed concrete structure only experiences compression damage at the corner of the side wall. As the strength of sprayed concrete increases, the stress distribution of sprayed concrete at the arch waist becomes more uniform. The stress concentration state of sprayed concrete at the corner of the tunnel wall and the plastic yield state of the steel rib structure have also been improved. The higher the concrete strength, the lower the stress ratio on the steel rib’s inner and outer sides.

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Case Study on Tunnel Settlement Calculations during Construction Considering Shield Disturbance

Cited by 8 publications

References 23 publications

Ground Deformation of Shield Tunneling through Composite Strata in Coastal Areas

Ground Deformation of Shield Tunneling through Composite Strata in Coastal Areas

Prediction method of longitudinal surface settlement caused by double shield tunnelling based on deep learning

Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

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