The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea
The influence of earthquakes on Zhubi Reef in the Nansha Islands of the South China Sea
复制标题
地震对南沙群岛渚碧礁的影响
DOI：
10.1007/s13131-017-1008-0
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发表时间：
2017-03
影响因子：
1.4
通讯作者：
Cheng Gong
中科院分区：
文献类型：
--
作者：
Guo Lei;Zhan Wenhuan;Zhang Fan;Zhang Jinchang;Yao Yantao;Li Jian;Feng Yingci;Chen Mei;Cheng Gong
对珊瑚礁的稳定性进行评估是非常重要的。近年来，南海礁滩建设项目不断增多。作为一种特殊的海洋岩土介质，它是由经历了极其漫长的地质时代的生物礁碎屑构成的。晚渐新世以后，生物礁在碳酸盐台地上发育，发育5 ~ 6种主要沉积相。它可以作为记录仪来测量最近地震的发生时间。根据南沙岛礁的地质构造特点，提出了一个礁体模型，用于研究地震对礁体的影响。利用GeoStudio软件模拟不同地震烈度下的应力和变形情况。采用极限平衡法计算安全系数，采用Newmark滑动块体法确定了地震诱发滑坡的可能情形和滑动规模，以及应力分布和变形特征。结果表明，珊瑚礁与地震的关系是：（1）礁体在自重状态下具有较好的稳定性，（2）地震发生后，当安全系数小于1（FS<1）时，可能引起边坡失稳并产生滑塌;（3）安全系数随地震烈度的增大而减小，并在一段时间后在某一特定值附近波动;（4）小型浅层滑坡作为礁体的新发育部分，在地震作用下易发生崩塌。结果表明，该方法可为珊瑚礁稳定性评价提供参考。这对南海的工程建设有一定的帮助。
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 (FS<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.
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DOI：
10.11867/j.issn.1001-8166.2014.11.1287
发表时间：
2014-11
期刊：
Advances in Earth Science
影响因子：
--
作者：
张光学;汪稔;余克服
通讯作者：
张光学;汪稔;余克服
南海南部某环礁原状地层连续取样技术及工程地质特征
DOI：
10.1080/10641190902967168
发表时间：
2009-10
期刊：
Maine Georesources and Geotechnology
影响因子：
--
作者：
KE-FU YU;CHAO YANG;QING-SHAN MENG;MING-JIAN HU;REN WANG;XIN-ZHI WANG
通讯作者：
XIN-ZHI WANG
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
Qiu Xie-lin
通讯作者：
Qiu Xie-lin
影响因子：
4
作者：
Kefu Yu;Jian-xin Zhao;Pinxian Wang;Q. Shi;Meng Qingshan;K. Collerson;Tung-sheng Liu
通讯作者：
Kefu Yu;Jian-xin Zhao;Pinxian Wang;Q. Shi;Meng Qingshan;K. Collerson;Tung-sheng Liu
影响因子：
2.9
作者：
Jih‐Hsin Chang;H. Hsu;Char‐Shine Liu;T. Lee;S. Chiu;C. Su;Yu-Fang Ma;Y. Chiu;H. Hung
通讯作者：
Jih‐Hsin Chang;H. Hsu;Char‐Shine Liu;T. Lee;S. Chiu;C. Su;Yu-Fang Ma;Y. Chiu;H. Hung