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| Model Test for the Seismic Response of Entrance on a Shallow-buried Double-staggered Mountain Tunnel |
| HUANG Min, ZHAO Yu-ru, YUAN Jun-jie, QIN Chang-kun, LEI Xiao-tian |
| School of Civil Engineering, Henan University of Engineering, Zhengzhou Henan 451191, China |
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Abstract The theoretical analysis of the seismic response of tunnels is still insufficient. The shaking table test is an effective way to study the earthquake resistance of tunnels; because of the complex nonlinear constitutive model of rock soil and the complicated seismic dynamic equation. In the LEBUGUOLAJI tunnel, the similarity ratio is 1:30. A thermal molten mixture of river sand, oil, and fly ash is used as the similar material of the surrounding rock, and gypsum is used as the similar material of the tunnel lining. A strain gauge is symmetrically pasted inside and outside the tunnel model lining to monitor the strain stress, and a structural accelerometer is installed on the tunnel model and shaking table to invert the surrounding rock of the model. The earthquake damage characteristics and engineering shock absorption measures of a shallow-buried double-staggered tunnel are determined using the large shaking table model test. Results show that the surrounding rock of the tunnel model exerts obvious enlargement effect on the input seismic wave, and its frequency spectrum changes. The seismic wave in frequency bands below 15 Hz is strengthened, whereas those in other frequency bands are attenuated. The seismic response of the tunnel is reduced by the confinement effect of rock and soil. On the basis of the similarity ratio of the model test, 45 m can be used as the fortification length of the tunnel entrance. The weak link of the tunnel portal section is the wall angle and the 45° of arch shoulder on the tunnel slope. The seismic damage in the gap section of the tunnel is more serious than that in other parts of the tunnel in the entrance. Thus, the rock and soil volume can be increased at the staggered area to enhance the rock and soil constraints of the site in design. A strong dynamic interaction occurs in the shallow-buried double-hole staggered mountain tunnel under seismic wave action. The seismic response of the tunnel with a large damping structure can be effectively reduced to minimize the damage of the lining strain.
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Received: 08 November 2019
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| Fund:Supported by the Science and Technology Research Plan of Henan Province(No.162102310403),Key Natural Science Research Projects of Henan Education Department(No.12A560004), Zhengzhou Science and Technology Development Plan Project(No.20130816),Doctoral Fund Project of Henan University of Engineering(No.D2012008) |
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Corresponding Authors:
HUANG Min
E-mail: huangmin_2006@163.com
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[1] PAN C S. A Survey of Seismic Problems of Tunnels and Underground Structures[J]. World tunnel,1996(5):7-16. (in Chinese)
[2] WANG W L, SU Z J, LIN J H et al. Discussion on Damaged Extent of Mountainous Tunnels Due to Earthquake of Taiwan JiJi[J]. Modern Tunnelling Technology,2001,38(2):52-60. (in Chinese)
[3] ZHU Y Q. Our Reflection on the Earthquake Damage to the No.109[J].National Defense Transportation Engineering and technology, 2008,(4):1-4. (in Chinese)
[4] CUI G Y, WU X G, WANG M N, et al. Earthquake Damages and Characteristics of Highway Tunnels in the 8.0-Magnitude Wenchuan Earthquake[J]. Modern Tunnelling Technology,2017,54(2):9-16. (in Chinese)
[5] ZANG W J. Damage to Highway Tunnels Caused by the Wenchuan Earthquake[J]. Modern Tunnelling TECHNOLOGY,2017,54(2):17-25. (in Chinese)
[6] REN H C, ZHANG J, QIU X J. Earthquake Damage Types and the Numerical Analysis of Influencing Actors about Destructiveness of Underground Cavern[J].South-to-North Water Transfers and Water Science & Technology, 2016,16(3):106-110. (in Chinese)
[7] GB50111-2006, Code for Seismic Design of Railway Engineering[S]. (in Chinese)
[8] GB50157-2013, Code for Design of Underground Railways[S]. (in Chinese)
[9] JTG B02-2013, Code for Seismic Design of Highway Engineering[S]. (in Chinese)
[10] LI Y S,LI T B,WANG D,et al. Large-scale Shaking Table Test for Vibration-absorption Measures of Portal Section of Huangcaoping tunnel #2[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1128-1135.(in Chinese)
[11] JIANG S P,WEN D L,ZHENG S B. Large-scale Shaking Table Test for Seismic Response in Portal Section of Galongla Tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(4):649-656.(in Chinese)
[12] TAO L J,LI S L,HOU S,et al. Shaking Table Test for Seismic Response in Portal Section of Mountain Tunnel[J]. World Earthquake Engineering, 2016, 32(4):7-16. (in Chinese)
[13] ZHOU J M,YAN Q,MENG G W. Experimental Research on Seismic Dynamic Model of Tunnel Lining Passing through Fault[J]. Journal of Highway and Transportation Research and Development,2013,30(12):114-119. (in Chinese)
[14] GAO F, SUN C X, TAN X K, et al. Shaking Table Tests for Seismic Response of Tunnels with Different Depths[J]. Rock and Soil Mechanics,2015,36(9):2517-2531. (in Chinese)
[15] LIANG Q G,BIAN L,ZHANG Q P,et al. Study on Seismic Dynamic Characteristics of Large Section Loess Tunnel Portal[J].Journal of Highway and Transportation Research and Development, 2018,35(7):65-76. (in Chinese)
[16] YANG J J. Similarity Theory and Structure Model Test[M]. Wuhan:Wuhan University of Technology Press,2005. (in Chinese)
[17] WANG W L, et al. Assessment of Damage in Mountain Tunnels Due to the Taiwan Chi-Chi Earthquake[J].Tunneling and Underground Space Technology.2001, (16):133-150.
[18] CHEN D H, PENG G, YAO Y H, et al. Research and Application on the Numerical Optimization of the Earthquake Wave Time-domain[J]. World Earthquake Engineering,2008,24(4):130-135. (in Chinese) |
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2020, Vol. 14 
