Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Discussion on Reasonable Clear Spacing of Twin-Tunnels in Weak Surrounding Rock: Analytical Solution and Numerical Analysis
https://orcid.org/https://orcid.org/0000-0003-2961-4738
https://orcid.org/https://orcid.org/0000-0001-5933-1304
https://orcid.org/https://orcid.org/0000-0001-9623-3738
https://orcid.org/https://orcid.org/0000-0002-6559-0377
https://orcid.org/https://orcid.org/0000-0002-5957-7563
Due to the limitations of the terrain and other reasons, twin-tunnels with small clear spacing are becoming more and more common. The reasonable clear spacing of twin-tunnels in weak surrounding rock is an urgent problem. In this paper, based on pressure-arch theory (PAT), the method used to calculate the loosening pressure on the surrounding rock of twin-tunnels under three cases was derived by considering the additional disturbance of the excavation on the middle rock pillar through the amplification factors of the sliding angles, k1 and k2. Taking the weak surrounding rock as an example, we discussed the effect of the clear spacing variation on the loosening pressure of the surrounding rock, and obtained the dangerous clear spacing of twin-tunnels. The accuracy and applicability of this approach were verified by the in-site data that were measured. Considering the limitation of the pressure-arch theory on a deep-buried tunnel under high geo-stress, based on the Jiuzhai valley-Mianyang highway in China, the reasonable clear spacing of twin-tunnels in weak surrounding rock at different buried depths, i.e., 400 m–1,600 m, is discussed using the numerical simulation method. The analytical solution indicated that the loosening pressure of the inner side of the first tunnel was greater than the one of the second due to the amplification factors of the sliding angles, k1 and k2. The in-site data showed that in the weak surrounding rock mass, when k1 and k2 are taken as 1.15 and 1.3, respectively, the loosening pressure distribution law is closest to the actual situation.
Discussion on Reasonable Clear Spacing of Twin-Tunnels in Weak Surrounding Rock: Analytical Solution and Numerical Analysis
https://orcid.org/https://orcid.org/0000-0003-2961-4738
https://orcid.org/https://orcid.org/0000-0001-5933-1304
https://orcid.org/https://orcid.org/0000-0001-9623-3738
https://orcid.org/https://orcid.org/0000-0002-6559-0377
https://orcid.org/https://orcid.org/0000-0002-5957-7563
Due to the limitations of the terrain and other reasons, twin-tunnels with small clear spacing are becoming more and more common. The reasonable clear spacing of twin-tunnels in weak surrounding rock is an urgent problem. In this paper, based on pressure-arch theory (PAT), the method used to calculate the loosening pressure on the surrounding rock of twin-tunnels under three cases was derived by considering the additional disturbance of the excavation on the middle rock pillar through the amplification factors of the sliding angles, k1 and k2. Taking the weak surrounding rock as an example, we discussed the effect of the clear spacing variation on the loosening pressure of the surrounding rock, and obtained the dangerous clear spacing of twin-tunnels. The accuracy and applicability of this approach were verified by the in-site data that were measured. Considering the limitation of the pressure-arch theory on a deep-buried tunnel under high geo-stress, based on the Jiuzhai valley-Mianyang highway in China, the reasonable clear spacing of twin-tunnels in weak surrounding rock at different buried depths, i.e., 400 m–1,600 m, is discussed using the numerical simulation method. The analytical solution indicated that the loosening pressure of the inner side of the first tunnel was greater than the one of the second due to the amplification factors of the sliding angles, k1 and k2. The in-site data showed that in the weak surrounding rock mass, when k1 and k2 are taken as 1.15 and 1.3, respectively, the loosening pressure distribution law is closest to the actual situation.
Discussion on Reasonable Clear Spacing of Twin-Tunnels in Weak Surrounding Rock: Analytical Solution and Numerical Analysis
https://orcid.org/https://orcid.org/0000-0003-2961-4738
https://orcid.org/https://orcid.org/0000-0001-5933-1304
https://orcid.org/https://orcid.org/0000-0001-9623-3738
https://orcid.org/https://orcid.org/0000-0002-6559-0377
https://orcid.org/https://orcid.org/0000-0002-5957-7563
Due to the limitations of the terrain and other reasons, twin-tunnels with small clear spacing are becoming more and more common. The reasonable clear spacing of twin-tunnels in weak surrounding rock is an urgent problem. In this paper, based on pressure-arch theory (PAT), the method used to calculate the loosening pressure on the surrounding rock of twin-tunnels under three cases was derived by considering the additional disturbance of the excavation on the middle rock pillar through the amplification factors of the sliding angles, k1 and k2. Taking the weak surrounding rock as an example, we discussed the effect of the clear spacing variation on the loosening pressure of the surrounding rock, and obtained the dangerous clear spacing of twin-tunnels. The accuracy and applicability of this approach were verified by the in-site data that were measured. Considering the limitation of the pressure-arch theory on a deep-buried tunnel under high geo-stress, based on the Jiuzhai valley-Mianyang highway in China, the reasonable clear spacing of twin-tunnels in weak surrounding rock at different buried depths, i.e., 400 m–1,600 m, is discussed using the numerical simulation method. The analytical solution indicated that the loosening pressure of the inner side of the first tunnel was greater than the one of the second due to the amplification factors of the sliding angles, k1 and k2. The in-site data showed that in the weak surrounding rock mass, when k1 and k2 are taken as 1.15 and 1.3, respectively, the loosening pressure distribution law is closest to the actual situation.
Discussion on Reasonable Clear Spacing of Twin-Tunnels in Weak Surrounding Rock: Analytical Solution and Numerical Analysis
KSCE J Civ Eng
Wu, Fangyin (Autor:in) / He, Chuan (Autor:in) / Kou, Hao (Autor:in) / Wang, Bo (Autor:in) / Meng, Wei (Autor:in) / Meng, Hailong (Autor:in) / Guo, Deping (Autor:in)
KSCE Journal of Civil Engineering ; 26 ; 2428-2442
01.05.2022
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Discussion on Stresses in Rock Surrounding Tunnels
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