scholarly journals Evaluation of Lateral and Axial Deformation for Earth Pressure Balance (EPB) Tunnel Construction Using 3 Dimension Finite Element Method

2021 ◽  
Vol 53 (5) ◽  
pp. 210503
Author(s):  
Fahmi Aldiamar ◽  
Masyhur Irsyam ◽  
Bigman Hutapea ◽  
Endra Susila ◽  
Ramli Nazir
Keyword(s):  
Finite Element ◽  
Position Control ◽  
Lateral Displacement ◽  
Earth Pressure ◽  
Surface Settlement ◽  
Soil Parameters ◽  
Tunnel Construction ◽  
Pressure Balance ◽  
Soil Model ◽  
Earth Pressure Balance

Mass Rapid Transit Jakarta (MRTJ) phase 1 tunnel construction using the earth pressure balance method has been completed and surface settlement and lateral displacement data according to elevation and inclinometer readings has been collected to evaluate the effect of tunnel’s construction on surrounding infrastructure. Soil stratification along the research area, defined according to boring logs and soil parameters for the hardening soil model (HSM) and the soft soil model (SSM), was determined by optimization of stress-strain curve fitting between CU triaxial test, consolidation test and soil test models in the Plaxis 3D software. Evaluation of the result of surface settlement measurements using an automatic digital level combined with geodetic GPS for elevation and position control points showed that the displacement behavior was affected by vehicle load and stiffness of the pavement. Lateral displacement measurements using inclinometers give a more accurate result since they are placed on the soil and external influences are smaller than surface settlement measurement. The result of 3D finite element modeling showed that surface settlement and lateral displacement during TBM construction can be predicted using HSM with 2% contraction. SSM and the closed-form solutions of Loganathan and Poulos are unable to provide a good result compared to the actual displacement from measurements.

Surface settlement during shield tunnelling at CH218 in Taipei

1998 ◽  
Vol 35 (1) ◽  
pp. 159-168 ◽  
Author(s):  
Chang-Yu Ou ◽  
Richard N Hwang ◽  
Wei-Jung Lai
Keyword(s):  
Ground Surface ◽  
Earth Pressure ◽  
Surface Settlement ◽  
Pressure Balance ◽  
Transit System ◽  
Ground Surface Settlement ◽  
Earth Pressure Balance Shield ◽  
Shield Tunnelling ◽  
Earth Pressure Balance ◽  
Twin Tunnels

This paper presents the surface settlement performance induced by the foamed type of earth pressure balance shield in contract CH218 of the Hsintien Line of the Taipei Rapid Transit System. The surface settlement characteristics caused by the single tunnel and by twin tunnels with reference to two sections spaced at 87 m are studied. Field observations indicate that the surface settlement trough due to the single tunnel can be represented by the normal distribution. The distance of the inflection point to the tunnel center and maximum surface settlement value are consistent with those found in the literature. The characteristics of the surface settlement trough are related to the type of the soil, particularly where the crown of the tunnel is located in a layered soil deposit. The ground surface settlement induced by twin tunnels was found to be larger than estimated using the principle of superposition.Key words: shield tunnelling, surface settlement, field observation.

Prediction and analysis of subsidence induced by shield tunnelling in the Madrid Metro extension

2002 ◽  
Vol 39 (6) ◽  
pp. 1273-1287 ◽  
Author(s):  
Manuel Melis ◽  
Luis Medina ◽  
José M Rodríguez
Keyword(s):  
Earth Pressure ◽  
Tunnel Construction ◽  
Pressure Balance ◽  
Ground Movements ◽  
Construction Methods ◽  
The Earth ◽  
Predictive Methods ◽  
Shield Tunnelling ◽  
Earth Pressure Balance ◽  
Numerical Modelling And Analysis

The development of tunnelling projects under heavily populated cities has been rapidly increasing around the world during the last decades. Since tunnel construction can have disastrous effects on buildings, structures, and utilities near the excavation, construction methods have necessarily to provide maximum safety inside and outside the tunnel. To predict and correct dangerous ground movements due to the tunnelling works, the authors developed a numerical model to simulate the earth pressure balance (EPB) excavation procedure and injection to complement some deficiencies found in previous analytical or empirical subsidence estimating procedures. This model takes into account the full excavation sequence and has been validated by a large amount of monitoring data from the previous Madrid Metro extension. In the present paper, several predictive methods are used to predict the ground movements generated during a new Madrid Metro extension project consisting of 48 km of tunnel (1999–2003). At the end of the works the results will be compared with data from monitored sections placed in all five cities linked by the extension. Conclusions about the applicability and accuracy of the methods will be established with the aim of helping researchers and engineers in their future projects.Key words: ground movements, monitoring, numerical modelling and analysis, settlement, tunnels.

The Finite Element Analysis of Piston under Thermal Load Based on UG/ANSYS

2012 ◽  
Vol 490-495 ◽  
pp. 2748-2751
Author(s):  
Li Zhi Wen ◽  
Zhi Wei Guan ◽  
Chen Fu Liu ◽  
Xi Tong Zhang
Keyword(s):  
Finite Element ◽  
Earth Pressure ◽  
Planetary Gear ◽  
Pressure Balance ◽  
Element Analysis ◽  
Joint Point ◽  
The Finite Element Analysis ◽  
Earth Pressure Balance Shield ◽  
Earth Pressure Balance ◽  
Shield Machine

The method to analysis the strength of planetary trains’ carriers of EPB(earth pressure balance) shield machine is presented in this paper. The structure of the shield machine trains is analyzed and the 3-D solid model of the carrier is built with Pro/E. After the load on the carrier has been dealt with, the strength of carrier is calculated by means of finite element method. The results via ANSYS show that the max stress and strain on the carriers are increasing as the increasing load on it. The max stress is lying on the joint point of the carrier and planetary gear shaft because of the bending deformation of the shaft

Design and Finite Element Calculation for Driving Shaft of Eccentric Multi-Axes Rectangular Shield Machine

2011 ◽  
Vol 101-102 ◽  
pp. 258-262 ◽  
Author(s):  
Qian Wei Zhuang ◽  
Jian Zhong Lv ◽  
Hua Qin Jiang
Keyword(s):  
Finite Element ◽  
Earth Pressure ◽  
Finite Element Calculation ◽  
Element Calculation ◽  
Pressure Balance ◽  
Eccentric Shaft ◽  
Structural Problems ◽  
Earth Pressure Balance Shield ◽  
Earth Pressure Balance ◽  
Shield Machine

This paper introduced the characteristics of eccentric multi-axes rectangular shield machine and made comparisons to traditional earth pressure balance shield machine. And introduced structure form of eccentric multi-axes, and carried out calculation of cutter head driving. The author completed the finite element calculation of eccentric axis with COSMOS Works, the results of calculation shows that maximum stress occurs at the place at gear keyway of eccentric shaft, but the eccentric shaft can satisfy the requirements in shield design according to big load in cutting soil. Finally, the eccentric shaft was applied in several engineering cases without any structural problems.

scholarly journals Prediction of Shield Machine Attitude Based on Various Artificial Intelligence Technologies

2021 ◽  
Vol 11 (21) ◽  
pp. 10264
Author(s):  
Haohan Xiao ◽  
Bo Xing ◽  
Yujie Wang ◽  
Peng Yu ◽  
Lipeng Liu ◽  
...  
Keyword(s):  
Cross Validation ◽  
Prediction Models ◽  
Earth Pressure ◽  
Tunnel Construction ◽  
Grid Search ◽  
Pressure Balance ◽  
Dynamic Prediction ◽  
Earth Pressure Balance ◽  
Shield Machine ◽  
Fold Cross Validation

The shield machine attitude (SMA) is the most important parameter in the process of tunnel construction. To prevent the shield machine from deviating from the design axis (DTA) of the tunnel, it is of great significance to accurately predict the dynamic characteristics of SMA. We establish eight SMA prediction models based on the data of five earth pressure balance (EPB) shield machines. The algorithms adopted in the models are four machine learning (ML) algorithms (KNN, SVR, RF, AdaBoost) and four deep learning (DL) algorithms (BPNN, CNN, LSTM, GRU). This paper obtains the hyperparameters of the models by utilizing grid search and K-fold cross-validation techniques and uses EVS and RMSE to verify and evaluate the prediction performances of the models. The prediction results reveal that the two best algorithms are the LSTM and GRU with EVS > 0.98 and RMSE < 1.5. Then, integrating ML algorithms and DL algorithms, we design a warning predictor for SMA. Through the historical 5-cycle data, the predictor can give a warning in advance if the SMA deviates significantly from DTA. This study indicates that AI technologies have considerable promise in the field of SMA dynamic prediction.

scholarly journals Evaluating the effect of EPBM operational parameters on surface settlement in soft ground

2020 ◽  
Author(s):  
Ali Naghi Dehghan ◽  
Ehsan Bagheri ◽  
Meysam Khodaei ◽  
Rouzbeh Imani Kalehsar
Keyword(s):  
Ground Surface ◽  
Coupled Model ◽  
Earth Pressure ◽  
Surface Settlement ◽  
Ground Settlement ◽  
Operational Parameters ◽  
Pressure Balance ◽  
Tunnel Face ◽  
Earth Pressure Balance ◽  
Parametric Analyses

Abstract The present study investigates the effects of some essential earth pressure balance machine (EPBM) operational parameters, including face, annulus and grout pressures, on ground surface settlement during tunnel excavation. A numerical soil-tunnel-fluid coupled model was developed using the finite difference method (FDM) in FLAC3D for the basis of this research. Hence, the effects of geostatic stress in the tunnel face and annulus and the grout pressure behind the segment on ground settlement were investigated by parametric analyses. The results indicated that a reduction in the boundary pressure (from 508 to 335 kPa) on the face and annulus space did not change the settlement significantly, altering the settlement from 1.18 to 1.48 mm. The results of parametric grout pressure analysis showed that applying a grout pressure equal to the vertical geostatic stress (i.e. 335 kPa) had a larger effect than applying horizontal geostatic stress (i.e. 357 kPa) to the tunnel face on controlling the ground settlement—i.e. 1.45 and 1.20 mm, respectively. A lateral earth pressure of below 1 (K0 &lt; 1) led to the estimation of horizontal geostatic stress value that was lower than the vertical geostatic stress value, thereby applying a lower effect to controlling the ground settlement. Grout pressure increment relative to the vertical geostatic stress considerably reduced the ground settlement. However, an excessive rise in the grout pressure could lead to deformation and upward displacements in the form of ground heaving at a transverse distance of above 20 m from the tunnel axis.

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