Determination of Deformation Mechanism and Countermeasures in Silty Clay Tunnel

Wu, Kui; Shao, Zhushan; Qin, Su; Li, Boxiao

doi:10.1061/(asce)cf.1943-5509.0001381

Cited by 54 publications

(28 citation statements)

References 31 publications

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“…At present, the main methods to improve the performance of geotextiles are additives, chemical modification, and composite geotextiles [114,115]. It is a shared method to use additives to make up the performance defects of geotextiles, such as stabilizers and antioxidants, but an army of additives are polluting the environment.…”

Section: High Performance Geotextilesmentioning

confidence: 99%

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Yao

et al. 2020

Materials

101

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Most geotextiles consist of polymers of polyolefin, polyester or polyamide family, which involve environmental problems related to soil pollution. Geotextiles can be used for at least one of the following functions: Separation, reinforcement, filtration, drainage, stabilization, barrier, and erosion protection. Due to the characteristics of high strength, low cost, and easy to use, geotextiles are widely used in geotechnical engineering such as soft foundation reinforcement, slope protection, and drainage system. This paper reviews composition and function of geotextiles in geotechnical engineering. In addition, based on literatures including the most recent data, the discussion turns to recent development of geotextiles, with emphasis on green geotextiles, intelligent geotextiles, and high-performance geotextiles. The present situation of these new geotextiles and their application in geotechnical engineering are reviewed.

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Section: High Performance Geotextilesmentioning

confidence: 99%

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Yao

et al. 2020

Materials

101

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“…erefore, in order to ensure the safety of pile structure, it is essential to take some measures, among which shield construction parameters should be optimized first. According to previous experience and references [55][56][57][58], the disturbance of shield tunneling to soils can be reduced by controlling the face support pressure (200 kPa), synchronous grouting pressure (250 kPa), and jacking force (3500 kPa). In addition, the effective schemes to substantially reduce the influence caused by tunneling are reinforcement of soil or adjacent pile itself, isolation, and pile foundation underpinning.…”

Section: Selection Of Protective Schemesmentioning

confidence: 99%

A Comparative Study of Protective Schemes for Shield Tunneling Adjacent to Pile Groups

Lai

et al. 2020

Advances in Civil Engineering

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Shield tunneling adjacent to pile groups is always an unavoidable problem in urban metro construction. A case was found in the project of Tianjin Metro Line 7, where a shield tunnel would be constructed near the existing pile groups of Shiyou Bridge. The whole shield tunnel is close to pile groups, and the minimum distance is only 0.8 m. Therefore, four kinds of protective schemes are proposed in this paper. It is vital to select an appropriate protective scheme to guarantee the safety during the tunnel construction. In this study, the main mechanical characteristic and physical parameters of site soil were obtained through laboratory tests. Besides, the three-dimensional finite element method was carried out to compare and analyze the effectiveness of the protective schemes in mitigating the effects of tunneling on adjacent pile groups. The results show that the deep-hole grouting scheme has better control effect on the lateral deformation and bending moment of piles, while the pile foundation underpinning scheme has better effectiveness on reducing the settlement of bridge structure and ground deformation. Finally, the deep-hole grouting reinforcement scheme will be adopted to ensure the shield passing through the pile groups smoothly.

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“…At present, there are some tunneling projects successfully constructed in SCM formation, and some technical experience has been obtained. Even though the construction technology of shallow excavation in SCM formation is far from mature, there are a lot of blanks in the design theory and construction technology of tunnel in BCM formation [10][11][12][13]. It is an ideal way to solve the engineering problems encountered in the construction of BCM formation by referring to the experience accumulated in the construction of SCM grounds [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

New Construction Technology of a Shallow Tunnel in Boulder‐Cobble Mixed Grounds

Liu

Zhong

Feng

et al. 2020

Advances in Civil Engineering

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As a typical granular bulk medium, problems are common in boulder-cobble mixed grounds, such as easy collapse and instability and difficult effective support for large-section tunnel excavation. Tunnels constructed in BCM grounds are rare still, and there is a big gap between the design and construction of tunnels. Based on the Nianggaicun highway tunnel crossing the BCM grounds, the construction technology of tunnel in BCM grounds is studied by means of literature investigation and field survey. Here are the main conclusions: the overall deformation of surrounding rock is quite small; the pressure distribution of surrounding rock is small and loose pressure is dominant, and the safety reserve of secondary lining is large. The deformation process of surrounding rock concentrates on the construction stage. During the construction process, there are many problems, such as serious overexcavation, difficulty of bolt penetration, and continuous rock fall. In this paper, a three-bench complementary cyclic excavation method is proposed, which replaces the original CD and CRD methods. Meanwhile, the supporting system is optimized. The results show that the disturbance of surrounding rock is reduced, while the safety of construction process and the reliability of structure are increased. The new excavation method and optimized supporting system are expected to fill the gap between design and construction of tunnel in BCM grounds and provide reference for construction of such tunnels in the future.

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Determination of Deformation Mechanism and Countermeasures in Silty Clay Tunnel

Cited by 54 publications

References 31 publications

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

A Comparative Study of Protective Schemes for Shield Tunneling Adjacent to Pile Groups

New Construction Technology of a Shallow Tunnel in Boulder‐Cobble Mixed Grounds

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