The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea
	Guo, L; Zhan, WH; Zhang, F; Zhang, JC; Yao, YT; Li, J; Feng, YC; Chen, M; Cheng, G; whzhan@scsio.ac.cn
刊名	ACTA OCEANOLOGICA SINICA
	2017
卷号	36 期号:3 页码:99-108
关键词	Zhubi Reef Earthquake Limit Equilibrium Method Safety Factor Nansha Islands South China Sea
英文摘要	It is exceedingly important to estimate the stability of coral reefs. In recent years, growing construction projects have been carried out on the reef flat in the South China Sea. As a special marine geotechnical medium, it is made of the reef debris underwent overwhelmingly long geological age. Reefs grow thickly on the carbonate platform after the Late Oligocene and have five to six main sedimentary facies. It can be used as a recorder to measure the occurrence time of recent earthquake. A model of reef body is presented to study the influence of earthquakes according to the geological structure characteristic of reefs in the Nansha Islands. Furthermore, GeoStudio is used to simulate stress and deformation situations within it under various earthquake intensities. A safety factor is calculated by the limit equilibrium method, and the possible scenarios of earthquake-induced landslides and sliding scale are defined with a Newmark sliding block method, as well as stress distribution and deformation behaviors. Therefore, the numerical results suggest that the connections between the coral reef and the earthquake are as follows: (1) the reef body has a good stability under self-gravity state; (2) after the earthquake, it may cause slope's instability and bring out slumping when the safety factor is smaller than 1 (F (S)< 1); (3) the safety factor decreases with the increasing earthquake intensity, and fluctuates around a particular value after a while; and (4) as a new developed part of the reef, the smaller shallow landslide will be easily subject to collapse caused by the earthquake. It is concluded that it is feasible to provide a reference for evaluating the stability of coral reef using a geotechnical engineering simulation method. This can help the engineering constructions in the South China Sea.
资助项目	MSG
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/16482]
专题	南海海洋研究所_中科院边缘海地质重点实验室
通讯作者	whzhan@scsio.ac.cn
推荐引用方式 GB/T 7714	Guo, L,Zhan, WH,Zhang, F,et al. The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea[J]. ACTA OCEANOLOGICA SINICA,2017,36(3):99-108.
APA	Guo, L.,Zhan, WH.,Zhang, F.,Zhang, JC.,Yao, YT.,...&whzhan@scsio.ac.cn.(2017).The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea.ACTA OCEANOLOGICA SINICA,36(3),99-108.
MLA	Guo, L,et al."The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea".ACTA OCEANOLOGICA SINICA 36.3(2017):99-108.