Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata

He, Chuan; Feng, Kun; Fang, Yong; Jiang, Yingchao

doi:10.1631/jzus.a12isgt6

Cited by 56 publications

(13 citation statements)

References 9 publications

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“…It can be seen that, in all the considered cases, the additional settlements induced by the second tunnel are smaller or shallower than the settlements induced by the first tunnel. The same observation was also made for the field measurement introduced by Suwansawat and Einstein (2007), Chen et al (2011) and He et al (2012).…”

Section: Surface Settlementssupporting

confidence: 64%

3D numerical investigation on the interaction between mechanized twin tunnels in soft ground

2014

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During the construction of twin tunnels excavated in close proximity to each other, the prediction of the influence of a new tunnel construction on an already existing one plays an important role in the design and construction of the tunnels. The researches in the literature indicate that this influence depends to a great extent on the distance between the tunnels. However, most of the reported cases in the literature on the mechanized excavation of twin tunnels have focused on the effects of the relative position between the two tunnels on surface settlements. Some of them have dealt with the behaviour of the tunnel structure through the use of simplified numerical models. The numerical investigation performed in this study, using the FLAC 3D finite difference code, has made it possible to predict the impact between tunnels using full three-dimensional simulations, in which most of the elements of a mechanized tunnel process have been modelled. The effects of tunnel distance on the structural forces induced in both tunnels, and the displacements in the surrounding ground have been highlighted. A modification has been made to the superposition method to predict the settlement surface trough over twin tunnels.

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Section: Surface Settlementssupporting

confidence: 64%

3D numerical investigation on the interaction between mechanized twin tunnels in soft ground

2014

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“…The Tunnel 1 lining reaches the peak horizontal displacement and the Tunnel 2 is exactly constructed, simultaneously. Then, the formation of the arching effect [13,21] and the installed lining of Tunnel 2 create an intense restriction to prevent the trend of right towards the movement of Tunnel 1 lining. Furthermore, the greater stability and larger stiffness of Tunnel 2 make Tunnel 1 lining move back by the rebound effect.…”

Section: Horizontal Displacementmentioning

confidence: 99%

“…On the other hand, Particle Flow Code (PFC) is one type of Discrete Element Method (DEM) which is proposed by Cundall [10][11] has great advantages for modeling underground project such as tunnel in solid mechanics and granular flow. To date, previous DEM research on twin tunnels [12][13][14] has been limited to two-dimensional analysis using PFC2D, which does not capture the out-of-plane effects and realistically simulate the dynamic construction process of twin tunnels. As such, three-dimensional DEM modelling of twin tunnels is needed to assess the impact of adjacent tunnel constructional on an existing adjacent tunnel.…”

Section: Introductionmentioning

confidence: 99%

Displacement and Deformation of the First Tunnel Lining During the Second Tunnel Construction

Zhang

et al. 2019

Civ Eng J

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A three-dimensional twin tunnels scale model was established utilizing the discrete element method (DEM) with PFC3D. This model aims to investigate the displacement (in horizontal and vertical directions) and deformation of the first tunnel lining in four different cases which the clear distance of twin tunnels are 5, 10, 15 and 20 m during the second tunnel construction process. The numerical results indicate that the clear distance between twin tunnels and the distance between the measurement points of the first tunnel and the excavation area of the second tunnel are two most critical factors that influence the displacement and deformation of the first tunnel lining. Meanwhile, the soil arching effect, gravity, water pressure and lateral pressure also have an impact on the behavior of the first tunnel. The maximum disturbance of horizontal and vertical displacements occurred in the time points of finishing of the second tunnel. However, the horizontal displacement of the first tunnel is much more sensitive to the vertical displacement. The first tunnel turns to the right and down in direction while having an anticlockwise rotation (φ) during the process of construction of the second tunnel. In addition, the displacement and deformation of the lining of the first tunnel are critical to monitor, and the necessary precautions should be taken to decrease the risk of craze. In conclusion, the influence of the second tunnel excavation on the first tunnel lining could be neglected when their distance is more than 15 m.

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“…A shield tunneling machine (STM) is a largescale piece of equipment ( Fig. 1) widely used in the construction of subways, railways, roadways, and city infrastructure (He et al, 2012;Liu et al, 2014). It can quickly, safely, and efficiently excavate and discharge soil, and install tunnel supports through its subsystems.…”

Section: Introductionmentioning

confidence: 99%

A cutterhead energy-saving technique for shield tunneling machines based on load characteristic prediction

Yang¹,

Gong²,

Yang³

et al. 2015

J. Zhejiang Univ. Sci. A

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In this paper, we propose a shield cutterhead load characteristic forecast method and apply it to optimize the efficiency of the cutterhead driving system. For the forecast method, wavelet transform is used for preprocessing, and grey model GM(1,1) for forecasting. The performance of the wavelet-based GM(1,1) (WGM(1,1)) is illustrated through field data based load characteristic prediction and analysis. A cutterhead mode control strategy (CMCS) is presented based on the WGM(1,1). The CMCS can not only provide operators with some useful operating information but also optimize the stator winding connection. Finally, the CMCS is tested on a cutterhead driving experimental platform. Results show that the optimized stator winding connection can improve the system efficiency through reducing the energy consumption under part-load conditions. Therefore, the energy-saving CMCS is useful and practical.

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Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata

Cited by 56 publications

References 9 publications

3D numerical investigation on the interaction between mechanized twin tunnels in soft ground

3D numerical investigation on the interaction between mechanized twin tunnels in soft ground

Displacement and Deformation of the First Tunnel Lining During the Second Tunnel Construction

A cutterhead energy-saving technique for shield tunneling machines based on load characteristic prediction

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