Movements of ground and existing structures induced by slurry pressure-balance tunnel boring machine (SPB TBM) tunnelling in clay

Cao, Liqiang; Zhang, Dingli; Fang, Qian; Yu, Lin

doi:10.1016/j.tust.2019.103278

Cited by 56 publications

(20 citation statements)

References 42 publications

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“…Its significance lies in the fact that the formulation considered the longitudinal advance of tunnel, thus making the equivalent beam method apply in 3D model. Currently, theoretical predictions are still inaccurate because the actual information of stratum environment is difficult to obtain [12][13][14][15].…”

Section: Introductionmentioning

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: Introductionmentioning

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 an internally unstable soil, seepage may cause the phenomenon of suffusion; the transport of fine particles by seepage flow is accompanied by a collapse of the soil structure [28][29][30]. Because geotextiles have positive permeability and air permeability, they can be placed in the soil structure to allow the liquid in the soil to pass through and discharged, and play a role of soil conservation, which can effectively prevent the loss of soil particles, fine sand, and small stones in the upstream, prevent soil damage, and effectively avoid the phenomenon of suffusion [31][32][33]. The mechanism is demonstrated in Figure 4.…”

Section: Geotextiles Used In Filtrationmentioning

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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“…The main reasons are as follows: (1) Because of the nonuniformity and uncertainty of the injected medium, such as the uncertainty and anisotropy of the permeability coefficient of soil, it is difficult to develop a theoretical method which can accurately predict the grouting process. (2) The variability of the grouting slurry itself and the influence of the medium on grouting slurry properties increase the difficulty of theoretical prediction [26,27]. Therefore, in engineering research, the grouting reinforcement zone is simplified and equivalent to a homogeneous stratum, which is simulated by improving the physical and mechanical parameters.…”

Section: Grouting Diffusion Calculation Of Rich Water Loess Tunnelmentioning

confidence: 99%

Treatment and Effect of Loess Metro Tunnel under Surrounding Pressure and Water Immersion Environment

Wang

Qiu

et al. 2020

Geofluids

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It is possible to pass through a collapsible loess stratum during metro tunneling. When the surrounding potential water sources with pressure are induced by external influences, the tunnel structure will be influenced in the affected area of loess collapsibility. To deal with the water inrush disaster of the tunnel in a collapsible loess stratum, the mechanism of grouting diffusion in the loess stratum is analyzed. It is found that the main influencing factors of the grouting effect are the radius of the grouting ring and the permeability coefficient of the grouting ring. Then, based on the water inrush section of a metro tunnel in Xi’an city, China, the treatment effect of the project is compared and analyzed through field tests, field monitoring, and finite element simulation. The results show that the water pressure at the measuring point of the tunnel vault is reduced by 4 MPa; the maximum and the minimum principal stresses at the top of the segment lining increased by 34.9 kPa and 8.8 kPa, respectively, which is less than the increase without grouting; and the maximum displacement of the surrounding rock is reduced by 19 mm. The plastic area produced by local water source infiltration is about 62% of that before grouting. The treatment measures of grouting in the tunnel are safe and effective. This study is of valuable meaning for the treatment of water inrush disaster of a loess tunnel under the water environment.

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Movements of ground and existing structures induced by slurry pressure-balance tunnel boring machine (SPB TBM) tunnelling in clay

Cited by 56 publications

References 42 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

Treatment and Effect of Loess Metro Tunnel under Surrounding Pressure and Water Immersion Environment

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