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1、DYNAMIC BEHAVIOR OF PORTAL PART OF TRAFFIC TUNNEL IN HIGH-INTENSITY EARTHQUAKE AREA交通隧道在高烈度地震区洞口动态行为的探究外文翻译专业名称：土木工程年级班级：道桥08-4班学生姓名：张 银指导教师：徐 平河南理工大学土木工程学院二一二年六月十一日 / DYNAMIC BEHAVIOR OF PORTAL PART OF TRAFFIC TUNNEL IN HIGH-INTENSITY EARTHQUAKE AREASHEN Yusheng1,2 ,GAO Bo2 ,WANG Zhengzheng2 ,WANG
2、Yingxue21Postdoctoral Station of Mechanics, Southwest Jiaotong University, Chengdu 610031, China; email:. 2School of Civil Engineering,Southwest Jiaotong University, Chengdu 610031, China; Abstract: A large-scale shaking table test is accomplished on the dynamic response and failure modes of the tun
3、nel. The result is that the largest dynamic response of tunnel structure appears at the side-wall and the shear or fracturing damage appears at the invert, which is basically the same damage state with tunnel engineering in 5.12 Wen Chuan earthquake. The internal force value of tunnel structure mini
4、sh and the numbers of cracks reduce after the shock absorption layer is set up in model test, and optimize the stress state of tunnel. The surface cracks of tunnel model appear firstly at both spandrels and develop diagonally at the tunnel entrance. The cracks arise X-shape distribution on the surfa
5、ce of the model soil. There are a lot of circumferential cracks at tunnel portal under the condition of dynamic loads, and most of longitudinal cracks or oblique cracks can terminate when extending to the circumferential cracks. So that it is proposed that there should be designed more shock absorpt
6、ion seams in the vicinity of tunnel portal in order to be propitious to damping the earthquake energy. Key words: dynamic behavior, shaking table test, high-intensity earthquake area1 Introduction It is regrettable that the peoples lives and property have suffered great losses during 5 12 Wenchuan e
7、arthquake in Sichuan province. At the same time the civil transport engineering are damaged to some extent, including the tunnel engineering. Tunnel damage survey shows that the tunnel portal section is the most easily to destroy and is the most weak parts(Li,2006). Especially at the high-intensity
8、earthquake area, the stability analysis of the tunnel entrance, portal and side slope will be focused on in the field of the anti-seismic technology research. The mechanical characteristic of tunnel lining is a considerably complex process, the grade of surrounding rock is various and there are a va
9、riety of non-linear features(Luo,2008). It is a effective way to research the tunnel anti-seismic characteristic by the shaking table test in the earthquake engineering field because the establishment of non-linear equations of motion and the numerical solution is still not perfect(Chen,2006; Gong,2
10、002; Yang, 2003; Zhou, 2005). It is inevitable to encounter any problems that the tunnel projects could be possible to adopted in the vicinity of the fault or high-intensity earthquake area during the construction of the traffic engineering in Western China regions (in particular the South-West). Th
11、e line from Yaan to Lugu highway is across the seismic faults several times (Xianshui River fault zone and Anning River fault zone) and the seismic fortification intensity is from degrees to degrees, in particularly degrees at local regions. The peak acceleration of ground motion is from 0.15g 0.4g,
12、 which parameters are the relative large in the current construction of the highway. In this paper, the dynamic characteristics of tunnel structure is analyzed at the mountain tunnel portal according to the actual engineering, thus the law of stress-strain and failure mode of the tunnel and surround
13、ing rock are researched under the ground motion load, which provides an important reference for the design and construction of the highway tunnel in high-intensity earthquake area.2 Relying on engineering conditions and shaking table test device 2.1 Geological conditions Model test was accomplished
14、in august 2007, based on certain tunnel project where there is through the region of seismic fortification intensity degrees and may be active faults in Ya-Lu highway. Based on drilling and surface survey, the tunnel stratum is mostly triassic systemJurassic system, silty mudstone, pelitic siltstone
15、, quartz sandstone, carbargillite, Cenozoic overlying Holocene Quaternary cover. 2.2 Shaking table test The shaking table at the Traction Power State Key Laboratory is the main facility for experimental research into earthquake engineering at Southwest Jiaotong University. The model test adopts the
16、bi-directional seismic shake table, which table size is 2.5 m by 2.5 m, the platform capable of carrying a maximum payload of 30t and the vibration mode is for X, Y two direction and four freedom degrees. The frequency range is 0.1 30 Hz, and the peak acceleration of X or Y direction is 1.0g respectively. It is driven
