|
|
|
| Influence of concave sedimentary soil layers in Suzhou city on characteristics of seismic response |
| 1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China |
|
|
|
|
Abstract For the sedimentary sites of Suzhou urban depression with non-uniform distribution of soil layers, a large-scale two-dimensional(2D) FE analytical model for concave sedimentary soil layers in Suzhou city was established based on the computing cluster platform of ABAQUS. The viscoelastic artificial boundary was proposed for simulating the boundary problem of infinite field, and the main characteristics of peak acceleration, peak displacement and spectrum were analyzed. The results show that the seismic response of concave sedimentary site presents great spatial difference, and the amplification effect of peak ground acceleration is obvious in some specific positions. The sensitive periods of the urban site of Suzhou city is about 0.20 to 0.70 s. Compared with the horizontal uniform site, the acceleration response spectrum of the concave sedimentary site changes significantly along the horizontal direction, and the corresponding spectrum peak shifts towards the long period direction as it comes close to the ground surface. Because the seismic waves are focused and amplified in some local areas, the PGA values in the concave sedimentary site show ups and downs along the direction of depth. The PGD values along the horizontal direction show non-monotone decreasing with the increasing of soil depth, which is related to the spectral characteristics of input ground motions. To some extent, the large-scale 2D FE model can reflect the effects of non-uniform distribution of soil layers on seismic wave propagation.
|
|
Received: 03 September 2018
|
|
|
|
| ［1］ |
CASTRO R R, PREZ-CAMPOS X, ZU＇N~IGA R, et al. A review on advances in seismology in Mexico after 30 years from the 1985 earthquake［J］. Journal of South American Earth Sciences,2016,70:49-54.
|
| ［2］ |
CHEN G X, ZHU J, QIANG M Y, et al. Three-dimensional site characterization with borehole data-a case study of Suzhou area［J］. Engineering Geology, 2018, 234: 65-82.
|
| ［3］ |
EL-EMAM M, KHAN Z, ABDALLA J, et al. Local site effects on seismic ground response of major cities in UAE［J］. Natural Hazards, 2015, 79(2): 791-814.
|
| ［4］ |
HLOSE C, BARD P Y, RODRIGUEZ-MAREK A. Site effect assessment using KiK-net data: part 1. a simple correction procedure for surface／downhole spectral ratios［J］. Bulletin of Earthquake Engineering, 2012,10 (2):421-448.
|
| ［5］ |
CHEN G X, JIN D D, ZHU J, et al. Nonlinear analysis on seismic site response of Fuzhou basin, China［J］. Bulletin of the Seismological Society of America, 2015,105(2): 928-949.
|
| ［6］ |
TAVAKOLI H, KUTANAEI S S. Evaluation of effect of soil characteristics on the seismic amplification factor using the neural network and reliability concept［J］. Arabian Journal of Geosciences, 2015, 8(6): 3881-3891.
|
| ［7］ |
李平. 汶川特大地震汉源震害异常研究［D］. 哈尔滨:中国地震局工程力学研究所,2013.
|
| ［8］ |
蔡永建, 郑水明, 吴建超. 20150425尼泊尔M8.1地震震害特征［J］. 大地测量与地球动力学, 2015, 35(4): 557-560.
|
|
CAI Y J, ZHENG S M, WU J C. Seismic disaster cha-racteristics of building of Nepal M8.1 earthquake on April 25, 2015［J］. Journal of Geodesy and Geodyna-mics, 2015, 35(4): 557-560.(in Chinese)
|
| ［9］ |
陈三红,张郁山. 圆弧状多层沉积凹陷在平面SV波入射下的动力响应［J］.岩土工程学报, 2017,39(6): 1074-1081.
|
|
CHEN S H, ZHANG Y S. Dynamic responses of canyon with multiple arc-shaped layers under incidence of plane SV waves［J］. Chinese Journal of Geotechnical Engineering, 2017,39(6): 1074-1081. (in Chinese)
|
| ［10］ |
朱姣, 陈国兴, 许汉刚. 地震基岩面的选取对深厚场地地表地震动参数的影响［J］. 岩土工程学报, 2015, 37(11): 2079-2087.
|
|
ZHU J, CHEN G X, XU H G. Effect of seismic bedrock interface depth on surface motion parameters of deep site［J］.Chinese Journal of Geotechnical Enginee-ring, 2015, 37(11): 2079-2087. (in Chinese)
|
| ［11］ |
刘晶波, 谷音, 杜义欣. 一致黏弹性人工边界及黏弹性边界单元［J］. 岩土工程学报, 2006, 28(9): 1070-1075.
|
|
LIU J B, GU Y, DU Y X. Consistent viscous-spring artificial boundaries and viscous-spring boundary elements［J］.Chinese Journal of Geotechnical Engineering, 2006, 28(9): 1070-1075. (in Chinese)
|
|
|
|
2019, Vol. 40 
