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A Study on the Influencing Factors on Ground Motion in a Valley Site
Li Ping,Bo Jingshan,Xiao Ruijie,Zhang Yudong
Author NameAffiliationE-mail
Li Ping Institute of Disaster Prevention chinaliping1981@126.com 
Bo Jingshan Institute of Disaster Prevention  
Xiao Ruijie Institute of Disaster Prevention  
Zhang Yudong Institute of Disaster Prevention  
摘要:
A trapezoid valley site is chosen as a research site, and according to numerical models based on orthogonal design, the factors influencing ground motion in the valley site are studied with two-dimensional finite difference method. The influencing factors are ranked, and then the calculation results are verified by ground motion analysis. The conclusions are as follows: There are four factors that have important effects on ground motion of trapezoid valley sites, but the effects are different as the location of sites changes, the influencing factors rank differently with different site locations;The ranking of the influencing factors is the same for all the sites located within a distance of 40m from the valley’s side, among them, the valley slope angle ranks the first,followed by depth-to-width ratio, overburden thickness, and lastly, the input ground motion intensity. The impact of the factors on surface ground motion is roughly the same in the valley sites within a certain distance to the valley side,and the geometric parameters of the valley terrain play a greater part in influencing ground motion. With the increase of distance away from the valley’s side, the ranking of the influencing factors also changes, the rating of slope angle moves backward, the ranking of the input ground motion and overburden thickness move ahead. The effect of valley geometric parameters on ground motions is gradually weakened, but the effect of other two influence factors are gradually increased, similar to cases of a horizontal layered site. Strong motion records in Anning River valley site were analyzed,and the results show that the valley topography has a significant amplification effect on ground motion, and that the numerical results of this paper are credible.
关键词:  valley site  ground motion  finite difference  influencing factors
DOI:DOI: 10.19743/j.cnki.0891-4176.201901005
分类号:
基金项目:Spark Program of Seismological Science and Technology, CEA(XH15067Y)and National Natural Foundation of China(51508096)
A Study on the Influencing Factors on Ground Motion in a Valley Site
Li Ping,Bo Jingshan,Xiao Ruijie,Zhang Yudong
Abstract:
A trapezoid valley site is chosen as a research site, and according to numerical models based on orthogonal design, the factors influencing ground motion in the valley site are studied with two-dimensional finite difference method. The influencing factors are ranked, and then the calculation results are verified by ground motion analysis. The conclusions are as follows: There are four factors that have important effects on ground motion of trapezoid valley sites, but the effects are different as the location of sites changes, the influencing factors rank differently with different site locations;The ranking of the influencing factors is the same for all the sites located within a distance of 40m from the valley’s side, among them, the valley slope angle ranks the first,followed by depth-to-width ratio, overburden thickness, and lastly, the input ground motion intensity. The impact of the factors on surface ground motion is roughly the same in the valley sites within a certain distance to the valley side,and the geometric parameters of the valley terrain play a greater part in influencing ground motion. With the increase of distance away from the valley’s side, the ranking of the influencing factors also changes, the rating of slope angle moves backward, the ranking of the input ground motion and overburden thickness move ahead. The effect of valley geometric parameters on ground motions is gradually weakened, but the effect of other two influence factors are gradually increased, similar to cases of a horizontal layered site. Strong motion records in Anning River valley site were analyzed,and the results show that the valley topography has a significant amplification effect on ground motion, and that the numerical results of this paper are credible.
Key words:  valley site  ground motion  finite difference  influencing factors