Moisture absorption characteristics and thermal insulation performance of thermal insulation materials for cold region tunnels

Li, Youyun; Sun, Yong-mei; Qiu, Junling; Liu, Tong; Yang, Li; She, Huidong

doi:10.1016/j.conbuildmat.2019.117765

Cited by 46 publications

(26 citation statements)

References 40 publications

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“…The reinforcement function of geotextiles is the most commonly used in geotechnical engineering. As shown in Figure 8, it has been widely used in reinforcing paved and unpaved roads and railroads, reinforcing walls, berms, and slopes and reinforcing soft soil foundations [6,36]. In addition to the above several main applications of geotextiles, the functions of geotextiles include barrier and erosion protection.…”

Section: Geotextiles Used In Reinforcementmentioning

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: Geotextiles Used In Reinforcementmentioning

confidence: 99%

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

Yao

et al. 2020

Materials

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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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“…Well-point dewatering is a method of lowering groundwater level by setting dewatering wells first and then by pumping equipment, and it is suitable for dewatering in shallow and medium strata within the range of 6∼15 m [30,31]. Well-point dewatering on surface is arranged as in Figure 4, and target dewatering layer is clay and silty soil [32][33][34]. Dewatering wells enter weak weathered granite 2 m [35][36][37][38].…”

Section: Well-point Dewateringmentioning

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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Moisture absorption characteristics and thermal insulation performance of thermal insulation materials for cold region tunnels

Cited by 46 publications

References 40 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

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

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