Effects of tunnelling on existing support systems of perpendicularly crossing tunnels

Liu, Hongyuan; Small, J. C.; Carter, John; Williams, David J.

doi:10.1016/j.compgeo.2009.01.013

Cited by 90 publications

(28 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all of these studies, the existing tunnels and new tunnels shared similar geometries (i.e., circular in shape and ordinary in size). However, it is not unusual to come across horseshoe-shaped tunnels (Kovári 2003;Shin et al 2005;Liu et al 2009). In fact, stress redistribution and deformation may be more severe in horseshoe-shaped tunnels than in circular tunnels (González-Nicieza et al 2008).…”

Section: Introductionmentioning

confidence: 97%

Effects of twin-tunnel excavation on an existing horseshoe-shaped tunnel considering the influence of a settlement joint

et al. 2017

View full text Add to dashboard Cite

In urban cities, the construction of a new tunnel would cause ground disturbance and affect any adjacent existing tunnel. Tunnel-tunnel interaction problems have not yet been comprehensively studied. In particular, the response of an existing horseshoe-shaped tunnel to the construction of two perpendicularly undercrossing tunnels remains unclear. In this study, three-dimensional centrifuge tests and three-dimensional numerical analysis were designed and conducted in dry sand to investigate the effects of twin-tunnel undercrossing on an existing horseshoe-shaped tunnel considering the influence of settlement joint. It is found that the adverse effects caused by later excavated tunnel were smaller than those by former one. For the existing tunnel without a settlement joint, the settlement at the invert and crown along the longitudinal direction showed sagging and hogging curves, respectively, owing to significant vertical elongation of the middle section. The presence of a settlement joint resulted in an increase in the settlement of the ground surface and the existing tunnel by over 100%. In both cases, larger bending strains were induced in the transverse direction than in the longitudinal direction, particularly around the corners.

show abstract

Section: Introductionmentioning

confidence: 97%

Effects of twin-tunnel excavation on an existing horseshoe-shaped tunnel considering the influence of a settlement joint

et al. 2017

View full text Add to dashboard Cite

show abstract

“…However, since the tests were carried out at 1 g, the actual stress condition in the prototype scale cannot be replicated, and hence, the dilatancy behaviour of soil cannot be properly captured. Liu et al [9] carried out three-dimensional finite element analysis to study the effects of tunnelling on the existing support system in rock mass when a new tunnel was constructed perpendicularly above and beneath existing tunnels, i.e., effects of construction sequence on the existing tunnel. e computed results revealed that the shotcrete lining experienced tension in the spring line, whereas the crown and the invert experienced compression for both construction sequences.…”

Section: Introductionmentioning

confidence: 99%

Effects of Construction Sequences and Volume Loss on Perpendicularly Crossing Tunnels

Zang

Gan

Yan

et al. 2019

Advances in Civil Engineering

View full text Add to dashboard Cite

The number of constructed tunnels has been gradually increasing for the past decades due to rapid development in urban areas. However, the soil-structure interaction problems arising from perpendicularly crossing tunnels attract relatively little research attention in the past. In this study, six three-dimensional finite element analyses were conducted to simulate tunnel excavation nearby a perpendicularly crossing existing tunnel, in an attempt to investigate the effects of construction sequences on cross-cutting tunnels. The hypoplastic constitutive model for sand is adopted in the numerical analysis to consider the soil small-strain stiffness. Computed results are presented and discussed in terms of ground surface settlement, displacement and deformation of the existing tunnel, and bending moment induced on the existing tunnel. The stress-transfer mechanism in soil nearby the existing tunnel due to tunnelling is also studied.

show abstract

“…According to the literature, using a variety of approaches such as physical model testing, field observations, empirical/analytical methods, and finite element modeling, interactions between closely-spaced tunnels were investigated in the past [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Investigation of Ground Settlements Induced by Construction of Istanbul Twin Metro Tunnels with Special Focus on Tunnel Spacing

Dibavar

Ahmadi

Davarpanah

2019

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

One of the most important considerations of tunneling in urban areas is controlling the amount of surface settlement that occurs during construction stages. The goal of this paper is to investigate the effect of spacing of Istanbul Twin Metro Tunnels on the surface settlement excavated by NATM method in YENIKAPI-UNKAPANI metro line. For this purpose, the focus has been placed on the effect of longitudinal and transversal spacing between tunnels supported by an umbrella arch protecting method. (FLAC3D) was implemented to simulate the excavation sequence. According to the analysis, the amount of settlement by numerical approach was about 23.5 mm which was in good agreement with the field monitoring results that was 26.5 mm. Moreover, the interaction between twin tunnels by the increase in spacing between twin tunnels in the direction perpendicular to tunnel axis decreases and becomes less effective at the location about 3 times of the tunnel diameter. Similarly, the interaction between twin tunnels in the direction parallel to tunnel axis decreases as the spacing increases. In other words, by increasing the distance between tunnel faces in longitudinal direction at a distance about 3 times of the tunnel diameter, there is still interaction between tunnels and it doesn’t disappear completely. Therefore, it is recommended to keep this distance at about more than 2.5 times of tunnel diameter so that settlement can stay within acceptable range.

show abstract

Effects of tunnelling on existing support systems of perpendicularly crossing tunnels

Cited by 90 publications

References 13 publications

Effects of twin-tunnel excavation on an existing horseshoe-shaped tunnel considering the influence of a settlement joint

Effects of twin-tunnel excavation on an existing horseshoe-shaped tunnel considering the influence of a settlement joint

Effects of Construction Sequences and Volume Loss on Perpendicularly Crossing Tunnels

3D Numerical Investigation of Ground Settlements Induced by Construction of Istanbul Twin Metro Tunnels with Special Focus on Tunnel Spacing

Contact Info

Product

Resources

About