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Influence of Waterproof and Drainage Layer Design Patterns on the Lining Water Pressure and Drainage Volume in Mountain Tunnels
https://orcid.org/http://orcid.org/0000-0003-2532-4709
To explore the influence of waterproof and drainage layer design patterns on the lining water pressure and tunnel drainage volume in mountain tunnels, seepage model tests and refined numerical simulations were conducted in this study based on the Hengwu Tunnel in Kaihua County (Zhejiang Province, China). The semi-enclosed waterproofing system and the separated fully-enclosed waterproofing system were comparatively analyzed in terms of the distribution characteristics of the lining water pressure and drainage volume. Finally, the design spacing between circumferential blind pipes in the waterproof and drainage layer was identified. The previous efforts contributed to the following results. (1) The difference in the hydraulic head between the initial support bottom and the secondary lining bottom in the two waterproofing models was 12.1 m and 30.2 m, respectively. (2) The maximum hydraulic head at the inverted arch in the fully-enclosed waterproofing model was only 0.46 times in comparison with that in the semi-enclosed waterproofing model. The smaller the distance from the blind pipe, the lower the lining water pressure. (3) The standard deviation (SD) of the water pressure at the feature points was 8.05 × 104 Pa and 19.95 × 104 Pa, respectively, in the fully-enclosed and semi-enclosed waterproofing systems. There was a relatively uniform lining water pressure distribution in the separated fully-enclosed waterproofing system. (4)The longitudinal spacing between circumferential blind pipes should be controlled within 7.71–12.71 m, which can meet the ecological water and lining safety requirements in this project.
Influence of Waterproof and Drainage Layer Design Patterns on the Lining Water Pressure and Drainage Volume in Mountain Tunnels
https://orcid.org/http://orcid.org/0000-0003-2532-4709
To explore the influence of waterproof and drainage layer design patterns on the lining water pressure and tunnel drainage volume in mountain tunnels, seepage model tests and refined numerical simulations were conducted in this study based on the Hengwu Tunnel in Kaihua County (Zhejiang Province, China). The semi-enclosed waterproofing system and the separated fully-enclosed waterproofing system were comparatively analyzed in terms of the distribution characteristics of the lining water pressure and drainage volume. Finally, the design spacing between circumferential blind pipes in the waterproof and drainage layer was identified. The previous efforts contributed to the following results. (1) The difference in the hydraulic head between the initial support bottom and the secondary lining bottom in the two waterproofing models was 12.1 m and 30.2 m, respectively. (2) The maximum hydraulic head at the inverted arch in the fully-enclosed waterproofing model was only 0.46 times in comparison with that in the semi-enclosed waterproofing model. The smaller the distance from the blind pipe, the lower the lining water pressure. (3) The standard deviation (SD) of the water pressure at the feature points was 8.05 × 104 Pa and 19.95 × 104 Pa, respectively, in the fully-enclosed and semi-enclosed waterproofing systems. There was a relatively uniform lining water pressure distribution in the separated fully-enclosed waterproofing system. (4)The longitudinal spacing between circumferential blind pipes should be controlled within 7.71–12.71 m, which can meet the ecological water and lining safety requirements in this project.
Influence of Waterproof and Drainage Layer Design Patterns on the Lining Water Pressure and Drainage Volume in Mountain Tunnels
https://orcid.org/http://orcid.org/0000-0003-2532-4709
To explore the influence of waterproof and drainage layer design patterns on the lining water pressure and tunnel drainage volume in mountain tunnels, seepage model tests and refined numerical simulations were conducted in this study based on the Hengwu Tunnel in Kaihua County (Zhejiang Province, China). The semi-enclosed waterproofing system and the separated fully-enclosed waterproofing system were comparatively analyzed in terms of the distribution characteristics of the lining water pressure and drainage volume. Finally, the design spacing between circumferential blind pipes in the waterproof and drainage layer was identified. The previous efforts contributed to the following results. (1) The difference in the hydraulic head between the initial support bottom and the secondary lining bottom in the two waterproofing models was 12.1 m and 30.2 m, respectively. (2) The maximum hydraulic head at the inverted arch in the fully-enclosed waterproofing model was only 0.46 times in comparison with that in the semi-enclosed waterproofing model. The smaller the distance from the blind pipe, the lower the lining water pressure. (3) The standard deviation (SD) of the water pressure at the feature points was 8.05 × 104 Pa and 19.95 × 104 Pa, respectively, in the fully-enclosed and semi-enclosed waterproofing systems. There was a relatively uniform lining water pressure distribution in the separated fully-enclosed waterproofing system. (4)The longitudinal spacing between circumferential blind pipes should be controlled within 7.71–12.71 m, which can meet the ecological water and lining safety requirements in this project.
Influence of Waterproof and Drainage Layer Design Patterns on the Lining Water Pressure and Drainage Volume in Mountain Tunnels
Int J Civ Eng
Liu, Xinrong (author) / Chen, Hai (author) / Zhou, Xiaohan (author) / Zhuang, Yang (author) / Deng, Jingzi (author) / Xu, Qiang (author)
International Journal of Civil Engineering ; 23 ; 637-654
2025-04-01
18 pages
Article (Journal)
Electronic Resource
English
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