Interactions of four tunnels driven in squeezing fault zone of Wushaoling Tunnel

Yang, Junsheng; Yan, Lei; Deng, Shaoqiang; Li, G.L.

doi:10.1016/j.tust.2005.12.176

Cited by 11 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The method of wave function expansion [25] is applied to obtain the series solution to Eqs. (2) and (3).…”

Section: Analytical Solutionmentioning

confidence: 99%

“…Furthermore, the construction of a third tunnel between two main structures is also becoming a practice, to provide protection in the event of accidental fire incidents or to connect the main tunnels located deep underground with the ground level [2]. Moreover, there are cases of even four tunnels in close proximity, among which the most famous is the Wushaoling Tunnel as the longest tunnel in China at present with the length of 22 km [3], as well as the four closely running subway tunnels in Kyoto City in Japan [4]. In many cases, for the need of accommodation of transportation systems and utility networks, a new tunnel has to be constructed closely located to an existing one.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Analysis of a Deeply Buried Tunnel Influenced by a Newly-built Adjacent Cavity with a Special Emphasis on the Minimum Seismically Safe Tunnel Distance

Zlatanović

Lukić

Sesov

et al. 2021

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

Contemporary life streams, more often than ever, impose the necessity for construction of new underground structures in the vicinity of existing tunnels, with an aim to accommodate transportation systems and utility networks. A previously uninvestigated case, in which a newly-constructed tunnel opening is closely positioned behind an existing tunnel, referred to as the tunnel–cavity configuration, has been considered in this study. An exact analytical solution is derived considering a pair of parallel circular cylindrical structures of infinite length, with the horizontal alignment, embedded in a boundless homogeneous, isotropic, elastic medium and excited by time-harmonic plane SV-waves under the plane-strain conditions. The Helmholtz decomposition theorem, the wave functions expansion method, the translational addition theorem for bi-cylindrical coordinates, and the pertinent boundary conditions are jointly employed in order to develop a closed-form solution of the corresponding boundary value problem. The primary goal of the present study is to examine the increase in dynamic stresses at an existing tunnel structure due to the presence of a closely driven unlined cavity, as well as in a localized region around the tunnel (at the position of the cavity in close proximity), under incident SV-waves. A new quantity called dynamic stress alteration factor is introduced and the aspect of the minimum seismically safe distance between the two structures is particularly considered.

show abstract

“…The method of wave function expansion [25] is applied to obtain the series solution to Eqs. (2) and (3).…”

Section: Analytical Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of a Deeply Buried Tunnel Influenced by a Newly-built Adjacent Cavity with a Special Emphasis on the Minimum Seismically Safe Tunnel Distance

Zlatanović

Lukić

Sesov

et al. 2021

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

show abstract

“…Typical squeezing tunnels in the world mainly include the Enasan highway tunnel in Japan (Kimura et al, 1987), the Tauern railway tunnel (Ayaydin and Leitner, 2009;Franz and Harald, 2009) and the Arlberg tunnel (John, 1980) in Austria, the Gotthard railway tunnel (Mezger et al, 2013) and the Simplon tunnel (Milnes, 1973) in Switzerland, the Lyon-Turin Base Tunnel (Bonini and Barla, 2012) connecting Italy and France, Y-Basque high-speed railway tunnels in northern Spain (Iasiello et al, 2021), etc. In China, most of the squeezing tunnels appear in the west, such as the Jiazhuqing tunnel (Zhang, 1997) on Nanning-Kunming Railway, the Wushaoling tunnel (Yang et al, 2006) on Lanzhou-Xinjiang Railway, the Guanjiao tunnel (Wan et al, 2014) on Qinghai-Tibet Railway, the Muzhailing tunnel (Zhang et al, 2010;Wu et al, 2015) on Lanzhou-Chongqing Railway, the Baozhen tunnel (Li et al, 2013) on Yichuan-Wanzhou Railway, etc. A large number of monitoring data from these projects showed that the squeezing deformation had the characteristics of large magnitude, large rate, and long duration, which led to the failure of the tunnel supports and even affected the operation stage.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanisms and dynamic process control measures of deep buried tunnels in tectonic fracture zones under high in-situ stresses—a case study in Southwestern China

Zheng,

Shi,

Zhao

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Squeezing deformation in tectonic fracture zones under high in-situ stresses has created great difficulties to deep tunnel construction in Southwestern China. This study reports an investigation on large deformation and failure mechanisms of the Wanhe tunnel on the China-Laos Railway through several field tests including the in-situ stress, loosened zone, deformation monitoring, and internal stresses of steel arches. The dynamic process control method is proposed following the combination principle of stress releasing and support resistance. Further, the dynamic process control measures including the advanced and primary supports, the deep-shallow coupled delayed grouting method, and the double steel arches method were applied on site to resist the deformation development. The results of this study indicate that the rapid growth of the tunnel deformation in the early stage was caused by the squeezing effect, and later the loosening effect led to another growing trend of the vault settlement. The dynamic process control method allows to release the deformation of the surrounding rock in the rapid growth stage. Then, it requires to control the deformation within the reserved range by reinforcing the surrounding rock and increasing the stiffness of supports in the later stage. From the feedback of monitoring results, large deformation of Wanhe tunnel was well released and effectively controlled within the deformation allowance. Thus these countermeasures based on the dynamic process control method can guarantee the construction safety of deep buried tunnels in tectonic fracture zones under high in-situ stresses.

show abstract

“…For mountain tunnel, fault zone is a weak section in construction, because of the weak physical and mechanical properties of surrounding rock mass. After excavation, the displacement of surrounding rock is larger than other sections, which causes larger stress for support structure [1][2][3] , the stability of tunnel rock in fault zone is difficult to be ensured [4] .…”

Section: Introductionmentioning

confidence: 99%

Optimization of Tunnel Support Type through Fault Zone

Guo

2014

AMM

View full text Add to dashboard Cite

The mechanical properties of tunnel surrounding rock in fault zone is usually quite weak, and the support pressure and displacement are larger than other sections, so the support type in fault zone is a critical issue for tunnel safety. Three types of tunnel support through fault zone were analyzed by finite element method (FEM): ①Reinforced concrete support, ②bolting-shotcreting and reinforced concrete support,③grouting and reinforced concrete support. The result shows that support stress and surrounding rock displacement with grouting and reinforced concrete support is quite smaller than the other support types.

show abstract

Interactions of four tunnels driven in squeezing fault zone of Wushaoling Tunnel

Cited by 11 publications

References 3 publications

Dynamic Analysis of a Deeply Buried Tunnel Influenced by a Newly-built Adjacent Cavity with a Special Emphasis on the Minimum Seismically Safe Tunnel Distance

Dynamic Analysis of a Deeply Buried Tunnel Influenced by a Newly-built Adjacent Cavity with a Special Emphasis on the Minimum Seismically Safe Tunnel Distance

Failure mechanisms and dynamic process control measures of deep buried tunnels in tectonic fracture zones under high in-situ stresses—a case study in Southwestern China

Optimization of Tunnel Support Type through Fault Zone

Contact Info

Product

Resources

About