Analysis Of Large Rock Deformation Under High In Situ Stress

Chen, S. G.; Zhao, Yuan; Zhang, H.

doi:10.3850/9789810844554-0101

Cited by 3 publications

(3 citation statements)

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“…The advance rate of the invert installation is the most important in the tunnel construction, as it affects greatly the construction of other working procedure such as excavation advance rate, drainage system, and lining. However, in the current railway tunnel construction, due to lack of relevant construction equipment and technologies, it is very difficult to assure a fast invert construction advance rate and achieve an integral invert casting [13,14]. In addition, with the increase of railway speed and tunnel section area, higher construction quality of tunnels is required in order to assure the tunnel quality and safety.…”

Section: Invert Installation Optimizationmentioning

confidence: 99%

New technologies for high-risk tunnel construction in Guiyang-Guangzhou high-speed railway

et al. 2013

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Based on the construction of high risk tunnels in Guiguang-Guangzhou high-speed railway, several new technologies were developed for high-risk tunnel construction. First, an integrated advanced geological prediction was developed for tunneling in karst area. Then, a new system of ventilation by involving the dedusting technology was proposed and used in the field, which received a good air quality. Finally, a method to minimize the distance between the working face and the invert installation was proposed by optimizing the invert installation and adopting the micro bench method. Applying the method to the project obtained an excellent result. The achievement obtained for this study would be able to provide a valuable reference to similar projects in the future.

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Section: Invert Installation Optimizationmentioning

confidence: 99%

New technologies for high-risk tunnel construction in Guiyang-Guangzhou high-speed railway

et al. 2013

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“…Based on relevant studies worldwide, big deformation in tunneling can be classified into four categories [6][7][8]: (1) squeezing deformation; (2) swelling deformation; (3) loosing deformation; and (4) soft rock deformation under high in situ stress, which frequently causes big deformation. There could be many factors influencing rock deformation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A construction strategy for a tunnel with big deformation

Chen

Tan

2013

J. Mod. Transport.

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By integrating literature reviews, site observation, field monitoring, theoretical analysis, summarization, etc., a construction strategy was proposed and verified for tunneling with big deformation in this paper. The tunnel was in phyllite, shotcrete cracks and steel arch distortion were observed, and a big deformation with a maximum of 2.0 m was monitored during the initial stage of the construction. Through carefully examining the site observation and laboratory test results, a construction principle was established for the tunneling on the basic concept of maintaining the rock strength/stiffness and keeping the rock dry, by providing confinement pressure to the rock, reducing the rock exposure time, keeping water out of the tunnel, etc. To achieve the construction principle, a set of specific construction measures with 11 items was further proposed and applied to the construction. To check the effectiveness of the construction measures, field monitoring was carried out, which showed that the rock deformation was well controlled and the tunnel became stable. An allowable deformation was then determined using the Fenner formulae and the monitored data in order to guide further construction, which received a good result. From this study, it can be concluded that providing quick strong initial support and reserving core soil at the working face are extremely important to control the rock deformation and keep the tunnel stable.

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“…1). It is the fourth largest hydropower station in China with a total capacity of 8.4 MkW, only next to the Three Gorge (22.4 MkW), Xiluodu (12.6 MkW) and Baihetan (12 MkW) [1]. The Jinping Hydropower Project construction started in 2004 and is expected to be completed in 2015.…”

Section: Introductionmentioning

confidence: 99%

Key technologies for construction of Jinping traffic tunnel with an extremely deep overburden and a high water pressure

et al. 2011

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Jinping traffic tunnel is one of the deepest traffic tunnels in the world with a maximum overburden of 2 375 m and the overburden over 73% of its total length is larger than 1 500 m. The tunnel is 17.5 km long and designed to provide a shortcut road between two hydropower stations: Jinping I and Jinping II of the Jinping Hydropower Project, located on Yalong River, Liangshan State, Sichuan Province, China. The tunnel is so deep that building any shafts is impossible. The construction starts from both ends (east and west ends), and the construction length from the west end is 10 km with a blind heading. This paper deals with an overview of this project and analysis of the engineering features, as well as key technologies developed and applied during the construction, including geological prediction, rock burst prevention under a super high in-situ stress, sealing of groundwater with a high pressure and big flow rate, ventilation for a blind heading of 10 km, wet spraying of shotcrete at zones of rock burst and rich water, etc. The application of the new technologies to the construction achieved a high quality tunnel within the contract period.

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Analysis Of Large Rock Deformation Under High In Situ Stress

Cited by 3 publications

References 0 publications

New technologies for high-risk tunnel construction in Guiyang-Guangzhou high-speed railway

New technologies for high-risk tunnel construction in Guiyang-Guangzhou high-speed railway

A construction strategy for a tunnel with big deformation

Key technologies for construction of Jinping traffic tunnel with an extremely deep overburden and a high water pressure

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