Stability analysis of a cross-sea tunnel structure under seepage and a bidirectional earthquake

doi:10.1061/(ASCE)GM.1943-5622.0000937

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	Stability analysis of a cross-sea tunnel structure under seepage and a bidirectional earthquake
	Cheng, Xuansheng 1; Zhang, Xiaoyan 1; Chen, Wenjun 1; Xu, Weiwei 1; Du, Xiuli 2
刊名	International Journal of Geomechanics
	2017-09-01
卷号	17 期号:9
关键词	Arches Earthquakes Ocean engineering Rock mechanics Rocks Safety factor Seawater effects Seepage Stability Tunnels Uncertainty analysis Bi-directional earthquakes Dynamic finite element Safety coefficient Stability analysis Stability safety factor Strength reduction method Tunnel structures Viscoelastic boundary condition
ISSN号	15323641
DOI	10.1061/(ASCE)GM.1943-5622.0000937
英文摘要	The rock mass surrounding a subsea tunnel often contains seawater, and the coupled effects of an earthquake and seepage introduce more uncertainty into analyses of tunnel safety. However, research on this topic is still lacking. In the present study, models of structure and fluid fields were established by considering the effect of a two-dimensional viscoelastic boundary condition, and the stability of a cross-sea tunnel structure under seepage and a bidirectional earthquake was studied. Using a static strength-reduction method on the basis of dynamic finite elements, a stability-safety coefficient was obtained. In addition, the influences of sea depth, overlying rock thickness, and permeability coefficient on the seismic dynamic stability-safety coefficient and varying characteristics of the plastic zone in a cross-sea tunnel structure under seepage and a bidirectional earthquake were studied through numerical examples. The results showed that under this type of earthquake, plastic zones first appeared on both sides of the tunnel arch feet and in the peripheral areas of the arch shoulders; by contrast, the vault was secure, and no plastic zone appeared in this area. When all factors were considered, the plastic zones extended farther when the overlying rock thickness and sea depth were greater. When the overlying rock was thick and the rock mass surrounding the tunnel was only slightly weathered, the rock mass was close to intact, and as a consequence, the permeability coefficient did not significantly affect the development of the plastic zone or the stability-safety factor. The influences of these three parameters on the safety of a subsea tunnel, as obtained in this paper, can provide a theoretical basis for the reasonable design of submarine tunnels. © 2017 American Society of Civil Engineers.
WOS研究方向	Engineering
语种	英语
出版者	American Society of Civil Engineers (ASCE)
WOS记录号	WOS:000417679300019
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114570]
专题	兰州理工大学
作者单位	1.School of Civil Engineering, Lanzhou Univ. of Technology, Lanzhou Shi, Gansu Sheng; 730000, China; 2.Key Laboratory of Urban Security and Disaster Engineering of Education, Beijing Univ. of Technology, Beijing; 100124, China
推荐引用方式 GB/T 7714	Cheng, Xuansheng,Zhang, Xiaoyan,Chen, Wenjun,et al. Stability analysis of a cross-sea tunnel structure under seepage and a bidirectional earthquake[J]. International Journal of Geomechanics,2017,17(9).
APA	Cheng, Xuansheng,Zhang, Xiaoyan,Chen, Wenjun,Xu, Weiwei,&Du, Xiuli.(2017).Stability analysis of a cross-sea tunnel structure under seepage and a bidirectional earthquake.International Journal of Geomechanics,17(9).
MLA	Cheng, Xuansheng,et al."Stability analysis of a cross-sea tunnel structure under seepage and a bidirectional earthquake".International Journal of Geomechanics 17.9(2017).