Design of sequential excavation method for large span urban tunnels in soft ground – Niayesh tunnel

Sharifzadeh, Mostafa; Kolivand, Farshad; Ghorbani, M.; Yasrobi, S. Shahaboddin

doi:10.1016/j.tust.2013.01.002

Cited by 142 publications

(35 citation statements)

References 7 publications

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“…According to the construction characteristics and especially to the construction sequences (Fang et al, 2012), the SEM used in HSR tunnels construction in China is categorized into four ''methods", named as TSEM, central diaphragm method (CDM), cross diaphragm method (CRDM) (Jiang et al, 2011), double sidedrift method (DSDM) (Sharifzadeha et al, 2013), respectively. Among these four methods, TSEM were the mainly excavation method with a total cutting length of 35,955 m, which accounted for 67.8%.…”

Section: Project Overviewmentioning

confidence: 99%

“…Loess has a significant character of randomly open and loose particle with high porosity (Tonon, 2011;Graziani and Boldini, 2012;Ng et al, 2012;Lisjak et al, 2015;Smalley and Derbyshire, 1991;Assallay et al, 1997;Jefferson et al, 2004). When a large span tunnel or underground space is constructed in loess ground, it inevitably disturbs the in situ stress field, and then causes large ground displacements (Sharifzadeha et al, 2013). Generally, loess is a multi-phase porous medium and develops complex stress and strain variation while executing a tunnelling project.…”

Section: Introductionmentioning

confidence: 99%

“…While tunnelling in soft ground, in order to promote the tunnel face stability and to reduce ground displacement, the tunnel face is partitioned either horizontally or vertically to several temporary drifts, which is called the sequential excavation method (SEM) (Sharifzadeha et al, 2013). The ground settlement induced by tunnelling varies according to the geometric parameters of the partitioned face such as the size and distribution of the drifts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Zhao²,

Zhou

2016

Tunnelling and Underground Space Technology

133

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Section: Project Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Zhao²,

Zhou

2016

Tunnelling and Underground Space Technology

133

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“…The excavation of a metro station tunnel in cities will inevitably disturb the stress field of the original land, causing the redistribution of stress and the settlement of surface and important buildings. 8,33,34 Therefore, it is highly important to predict the possible settlement during construction. After the construction based on the two methods, Figures 5 and 6 described surface settlement trough curves when Y = 20.45 m and vertical displacement diagrams of the sewage pipe, respectively.…”

Section: Analysis Of Calculation Resultsmentioning

confidence: 99%

Study on adaptability of primary support arch cover method for large-span embedded tunnels in the upper-soft lower-hard stratum

Wang

Song

et al. 2019

Advances in Mechanical Engineering

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The Provincial Hospital Station of Guiyang Metro Line No. 2 in China is located on the upper-soft lower-hard stratum. In order to analyze the adaptability of primary support arch cover method for the project, the construction process of the main tunnel of the Provincial Hospital Station is simulated by virtue of numerical simulation. Meanwhile, the excavation process of the tunnel is simulated by the double-side drift method for comparison. The numerical simulation results show that the primary support arch cover method has advantages in settlement control, plastic zone distribution, and supporting structure safety. Only the primary supporting structure is relatively weak in the rock-soil interface and on the arch shoulders and vault, and liable to tension failure. However, the application of strengthened primary support can significantly improve this unfavorable situation. Therefore, it is suggested that the primary support arch cover method be adopted for the construction of the main tunnel of the Provincial Hospital Station. The numerical simulation results obtained by primary support arch cover method are consistent with the field data in terms of the change trend of surface settlement, and the final settlement value is also similar. On this basis, the influence of grade variation of underlying surrounding rock on surface settlement and surrounding rock plastic zone distribution caused by the two methods is further simulated, and the grade range of underlying surrounding rock suitable for primary support arch cover method is given in the article.

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“…With development and the urbanization of the city, the underground space development and the utilization of urban development have gradually become significant factors of cities' sustainable development [1] . Thus, when the excavation of extra-large cross-section tunnels or underground space is enforced, it could effectively solve the problem of urban sustainable development, but the inevitable environmental impacts and building operation bring challenges for engineers, that it inevitably disturbs the in situ stress field which causes ground movements leading to surface settlement, which may cause serious damage to adjacent structures [2] .…”

Section: Introductionmentioning

confidence: 99%

The Researches on Construction Response and Excavation Method Optimization of Extra-large Cross-section Urban Subway Tunnel

Huang

Zhao

2018

E3S Web Conf.

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In the extra-large cross-section urban subway underground station projects, the key problem is to choose the appropriate excavation method and grasp the mechanical behavior of the surrounding rock after excavation. The double side drift method is widely used in the urban subway underground station construction with extra-large cross-section in China. This paper presents the deformation characteristics of the extra-large cross-section tunnel of urban subway and a comparison with the numerical simulation results. In the city subway underground excavation of large section station, the mechanical behavior of surrounding rock change and its influence on the surrounding area mainly depend on the selection of construction methods. The convergent deformation of tunnel cavern, the subsidence of the surface and the force failure of the surrounding rock associated the construction approaches are demonstrated. This study provides a more in-depth demonstration of the way to optimize the excavation method of the extra-large cross-section tunnel to achieve the purpose of controlling the deformation of the surface and surrounding rock.

show abstract

Design of sequential excavation method for large span urban tunnels in soft ground – Niayesh tunnel

Cited by 142 publications

References 7 publications

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Displacement characteristics of high-speed railway tunnel construction in loess ground by using multi-step excavation method

Study on adaptability of primary support arch cover method for large-span embedded tunnels in the upper-soft lower-hard stratum

The Researches on Construction Response and Excavation Method Optimization of Extra-large Cross-section Urban Subway Tunnel

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