毕业设计方案外文翻译.doc
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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 银指引教师: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 Ying
2、xue21Postdoctoral 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 tunnel. The res
3、ult 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 minish and the nu
4、mbers 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 surface of the mode
5、l 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 absorption seams in th
6、e 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 earthquake in Sichu
7、an 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,). Especially at the high-intensity earthquake area,the sta
8、bility 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 variety of non-linear featur
9、es(Luo,). 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,;Gong,;Yang,;Zhou,). It is inevitable to e
10、ncounter 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). The line from Yaan to Lugu highway is across the seis
11、mic 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,which parameters are the relative large in the curre
12、nt 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 surrounding rock are researched under the ground motion load,wh
13、ich 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 in august ,based on certain tunnel project where there i
14、s 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,quartz sandstone,carbargillite,Cenozoic overlying Holocene Quat
15、ernary 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 bi-directional seismic shake table,which table size is 2.5 m by 2.5
16、 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 horizontally and vertically by four 20kN servo actu
17、ators giving full control of motion of the platform in 4 DOF simultaneously. 3 Design of model test similar parameters Taking into account the model border effect,the width of the box model should be more than 6 times the tunnel width,thus the similar parameters are determined(geometry similar CL =3
18、0,Youngs modulus CE = 45,density C =1.5) and Shen () described the rest of physical similar parameters. 3.1 Design of similar material for surrounding rock and secondary lining According to the similar relation and the physico-mechanical parameters of surrounding rock in situ,the similar material se
19、lected is consisted of flyash,river sand and oil after the orthogonal tests are repeated dozens of times. At last these similar material will be mixed according to a certain similar ratio.The secondary lining material selected is consisted of plaster,quartz sand,barite,water by a certain percentage
20、of preparation,which mechanical parameters are shown in Table. 1. Table.1 Mechanical parameters of concrete similar materialparametersDesign valueTheory valueTest valueSimilitude relation (kN/m3)2516.717.0reasonableE(MPa)29.50.660.72reasonablec (MPa)12.50.30.426approximately4 Test measurement and sc
21、heme 4.1 Strain measurement of tunnel structureStrain gauges are firstly arranged for the tunnel site where the internal force and deformation of tunnel is maximal. The sensor wire should be firmly fixed at the surface of the model structure and fetched out from the certain position where the model
22、displacement is lesser at that direction. The schematic diagram of measurement points are laid in Figure.1 in order to verify the dynamic response law of tunnel structure. Figure.1 Layout scheme of sensors Figure.2 Accelerations time-histories curve4.2 Test load -earthquake wave The earthquake waves
23、 adopted is the artificial wave that is synthesized by the Sichuan Seismological Bureau under the conditions of the site response spectrum synthesis in model test. The exceedance probability of earthquake waves is2% ,the original peak acceleration is 0.67g,the hold time is about 20s in the part of s
24、trong shock,most of the earthquake waves Energy is less than 15s and is within 15Hz in the frequency (in Figure. 2). 4.3 Test scheme In Table.2,the case 2 and 3 are to study the effect of the shock absorption layer. The polyethylene material that is adopted to the shock absorption layer circumfuses
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