Analytical solutions of non-Darcy seepage of grouted subsea tunnels

Zhang, Yu; Zhang, Dingli; Fang, Qian; Xiong, Leijin; Yu, Lin; Zhou, Mingchao

doi:10.1016/j.tust.2019.103182

Cited by 62 publications

(13 citation statements)

References 32 publications

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“…Finding suitable high-performance fibers has always been a crucial research direction of high-performance geotextiles. The strength and modulus of inorganic fiber such as glass fiber [117], basalt fiber [118], and carbon fiber [119][120][121][122][123] are obviously higher than that of synthetic fiber. However, due to the high production cost, a large area of inorganic fiber on geotextiles is limited.…”

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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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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“…TSEM is one of the sequential excavation method (SEM), based on the bench cut method, and reserving core soil and staggering excavation from the left to right, which is conducive to stability of the tunnel face [45,46]. Longitudinal perspective of TSEM is shown in Figure 7 [47][48][49][50].…”

Section: Construction Sequences Of Tsemmentioning

confidence: 99%

Displacement Characteristics of an Urban Tunnel in Silty Soil by the Shallow Tunnelling Method

Zhang

Qiu

et al. 2020

Advances in Civil Engineering

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The urban shallow tunnelling process in silty soil is easy to cause large displacement of surface and tunnel. Obviously, if the strata and the tunnel face are not treated by reasonable reinforcement method, instability and collapse phenomenon will be encountered during the tunnel excavation. There are a series of studies on construction methods of shallow tunnels, but these methods have limitations in silty soil. In this study, a comprehensive construction plan of the urban shallow tunnel in silty soil was proposed and applied to a case study in Fuzhou, Fujian Province in South China. The in situ monitoring tests and numerical simulation were employed to address displacement characteristics of surface and tunnel. Results indicated that the urban shallow tunnelling process could achieve good effect by dewatering of silty soil, reinforcing surface by vertical jet grouting piles, and advanced small pipes and circumferential grouting in the tunnel face; surface settlement during dewatering process accounted for about 30% of total surface settlement in silty soil; the excavation of the top heading, the middle, and lower benches had great effect on displacement of surface and tunnel for three-bench seven-step excavation method in silty soil; surface settlement troughs in silty soil were deeper and wider; lock-feet bolts had good effect on restricting horizontal convergence; and ratio of total crown settlement and total horizontal convergence was in range of 1.43∼1.59 when b/h was 0.88 in silty soil. The construction plan proposed in this paper is helpful for further study of shallow tunnel tunnelling process in silty soil.

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“…When grout is injected into the soil, part of cement particles is blocked by skeleton of soil particles, resulting in stagnation and filtration of these cement particles as well as decrease of grout concentration and blockage of the soil pores. e grouting effect is significantly influenced by limited diffusion channels of the grout [28,[45][46][47]. Advances in Materials Science and Engineering 13…”

Section: Advances In Materials Science and Engineeringmentioning

confidence: 99%

Modelling of Permeation Grouting considering Grout Self-Gravity Effect: Theoretical and Experimental Study

Wang

Zhang

et al. 2019

Advances in Materials Science and Engineering

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Self-gravity is one key parameter for behavior characterization of grout permeation and diffusion.is study proposes mathematical models for permeation grouting with consideration of grout self-gravity effect. e models concerning power law, Bingham, and Newtonian grouts are based on the generalized Darcy's law and spherical diffusion theory. In addition, a prediction model of grout concretion dimension used for Bingham grout was developed. An analysis of the injection pressure distribution law and a comparative evaluation of diffusion radius considering self-gravity effect using established models were conducted subsequently. Moreover, grouting experiments were performed to check and verify the prediction model. e experimental results showed that injection pressure decreases linearly with increase of diffusion radius for the power-law grout, while nonlinear decrease of injection pressure was confirmed in Bingham and Newtonian grouts in this case. ree grouts approximately diffuse in an "ellipsoidal" shape, and it is confirmed that the diffusion radius is closely related to grout self-gravity. e Newtonian grout produces the maximum diffusion radius compared with the other two grouts whether the gravity effects were considered or not. e grout quantity under a smaller water-to-cement (w/c) ratio exhibits a significant difference and undergoes two increasing stages, whereas the quantity simply tends to be stable after it reaches its maximum in terms of the larger (w/c) ratios. e constructed dimension prediction model agrees well with the experimental results, which can be helpful for design and assessment of the grouting scheme.

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Analytical solutions of non-Darcy seepage of grouted subsea tunnels

Cited by 62 publications

References 32 publications

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Displacement Characteristics of an Urban Tunnel in Silty Soil by the Shallow Tunnelling Method

Modelling of Permeation Grouting considering Grout Self-Gravity Effect: Theoretical and Experimental Study

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