Experimental study on the effectiveness of strengthening over-deformed segmental tunnel lining by steel plates

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Experimental study on the effectiveness of strengthening over-deformed segmental tunnel lining by steel plates. / Zhai, Wuzhou; Chapman, David; Zhang, Dong-ming; Huang, Hong-wei.

In: Tunnelling and Underground Space Technology, Vol. 104, 103530, 10.2020.

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@article{75351594bfe6499f907f61ac24d2cb34,
title = "Experimental study on the effectiveness of strengthening over-deformed segmental tunnel lining by steel plates",
abstract = "The method of using steel plates to strengthen existing tunnel linings has been widely applied in many tunnel rehabilitation projects around the world. However, the effectiveness of the strengthening resulting from this method is still unclear, especially for conditions when the segmental linings are deformed to a relatively large extent. In this paper, a series of physical model tests conducted in 1-g plane strain conditions were designed to study the strengthening effectiveness of steel plates for over-deformed segmental tunnel linings. The results show that the segmental tunnel linings affected by the ground surface surcharge will deform nonlinearly, as the complex behaviour of the segment joints at different positions lead to a gradual degradation of the tunnel overall performance. Once the deformed segmental tunnel linings were strengthened by steel plates, the stiffness and capacity of the tunnel were improved by 190% and 69%, respectively, compared to those without strengthening. Subsequently, the strengthening effectiveness of tunnels strengthened at different deformation stages are compared quantitatively. It is found that an increase in the tunnel deformation before strengthening led to a decrease in the stiffness and an increase in the total capacity of the tunnel after strengthening, while the increased capacity was less affected. ",
keywords = "Segmental tunnel lining, Steel plate strengthening, Model test",
author = "Wuzhou Zhai and David Chapman and Dong-ming Zhang and Hong-wei Huang",
year = "2020",
month = oct,
doi = "10.1016/j.tust.2020.103530",
language = "English",
volume = "104",
journal = "Tunnelling and Underground Space Technology",
issn = "0886-7798",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Experimental study on the effectiveness of strengthening over-deformed segmental tunnel lining by steel plates

AU - Zhai, Wuzhou

AU - Chapman, David

AU - Zhang, Dong-ming

AU - Huang, Hong-wei

PY - 2020/10

Y1 - 2020/10

N2 - The method of using steel plates to strengthen existing tunnel linings has been widely applied in many tunnel rehabilitation projects around the world. However, the effectiveness of the strengthening resulting from this method is still unclear, especially for conditions when the segmental linings are deformed to a relatively large extent. In this paper, a series of physical model tests conducted in 1-g plane strain conditions were designed to study the strengthening effectiveness of steel plates for over-deformed segmental tunnel linings. The results show that the segmental tunnel linings affected by the ground surface surcharge will deform nonlinearly, as the complex behaviour of the segment joints at different positions lead to a gradual degradation of the tunnel overall performance. Once the deformed segmental tunnel linings were strengthened by steel plates, the stiffness and capacity of the tunnel were improved by 190% and 69%, respectively, compared to those without strengthening. Subsequently, the strengthening effectiveness of tunnels strengthened at different deformation stages are compared quantitatively. It is found that an increase in the tunnel deformation before strengthening led to a decrease in the stiffness and an increase in the total capacity of the tunnel after strengthening, while the increased capacity was less affected.

AB - The method of using steel plates to strengthen existing tunnel linings has been widely applied in many tunnel rehabilitation projects around the world. However, the effectiveness of the strengthening resulting from this method is still unclear, especially for conditions when the segmental linings are deformed to a relatively large extent. In this paper, a series of physical model tests conducted in 1-g plane strain conditions were designed to study the strengthening effectiveness of steel plates for over-deformed segmental tunnel linings. The results show that the segmental tunnel linings affected by the ground surface surcharge will deform nonlinearly, as the complex behaviour of the segment joints at different positions lead to a gradual degradation of the tunnel overall performance. Once the deformed segmental tunnel linings were strengthened by steel plates, the stiffness and capacity of the tunnel were improved by 190% and 69%, respectively, compared to those without strengthening. Subsequently, the strengthening effectiveness of tunnels strengthened at different deformation stages are compared quantitatively. It is found that an increase in the tunnel deformation before strengthening led to a decrease in the stiffness and an increase in the total capacity of the tunnel after strengthening, while the increased capacity was less affected.

KW - Segmental tunnel lining

KW - Steel plate strengthening

KW - Model test

U2 - 10.1016/j.tust.2020.103530

DO - 10.1016/j.tust.2020.103530

M3 - Article

VL - 104

JO - Tunnelling and Underground Space Technology

JF - Tunnelling and Underground Space Technology

SN - 0886-7798

M1 - 103530

ER -