Failure behavior investigation of loess metro tunnel under local-high-pressure water environment

Qiu, Junling; Lu, Yuquan; Lai, Jinxing; Guo, Chunxia; Wang, Ke

doi:10.1016/j.engfailanal.2020.104631

Cited by 68 publications

(20 citation statements)

References 24 publications

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“…ere exists 1 m thick saturated soft loess 1.5 m above the tunnel which is water-rich (liquid index I L � 1.0), plastic, and unstable. Without appropriate grouting slurry to consolidate the surrounding soil in advance, the construction disturbance may lead to hazards such as excessive subsidence or even collapse [41,42]. e existing surface building would also be affected.…”

Section: Geological Conditionsmentioning

confidence: 99%

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Lai

et al. 2020

Advances in Civil Engineering

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Techniques including pre-grouting, long pipe roof, and parameter optimization were employed to ensure the safety of loess metro tunnelling under an existing glass building. Their effects were proved through monitoring the settlement of building and surface during tunnelling. Besides, division of settlement monitoring according to processes, a new method, was conducted to control settlement in time. The highest surface settlement after construction was 16 mm only, meeting the requirement. The result indicates that it is practicable to control the tunnelling settlement strictly in extremely difficult geological areas. The settlement regularities were also studied through numerical simulation; their deformation is larger compared with in situ results while their change trends coincide during most processes. Soil excavations cause settlement primarily, accounting for more than 60%. It is suggested that dual slurry pre-grouting and process-based measurement should be employed before each excavation in water-rich loess areas.

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Section: Geological Conditionsmentioning

confidence: 99%

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Lai

et al. 2020

Advances in Civil Engineering

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“…In addition to the above several fiber materials, there are an army of fiber materials, which have the possibility of being used as high-performance geotextile raw materials, among which the most desirable one is nanofiber. Nanofibers are one of the most advanced materials, which can be easily designed into high-performance materials with unique performance, and can greatly enhance the performance of existing geotextiles [128][129][130][131].…”

Section: High Performance Geotextilesmentioning

confidence: 99%

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Yao

et al. 2020

Materials

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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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“…e prereinforcement effect of BCM formation is very poor due to the collapse of rock surface and blockage of boreholes. In addition, when adopting self-propelled bolt reinforcement, it is easy to be hindered by large floated rocks and cobble, resulting in the problem of inaccessibility [7][8][9]. e failure modes of bouldercobble mixed grounds include local collapse, arch collapse, and penetration collapse.…”

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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Failure behavior investigation of loess metro tunnel under local-high-pressure water environment

Cited by 68 publications

References 24 publications

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

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

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