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| Titel |
Preliminary numerical simulation for shallow strata stability of coral reef in South China Sea |
| VerfasserIn |
Qinqin Tang, Wenhuan Zhan, Jinchang Zhang |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250138713
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| Publikation (Nr.) |
 EGU/EGU2017-1827.pdf |
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| Zusammenfassung |
| Coral reefs are the geologic material and special rock and soil, which live in shallow water of
the tropic ocean and are formed through biological and geological action. Since
infrastructure construction is being increasingly developed on coral reefs during
recent years, it is necessary to evaluate the shallow strata stability of coral reefs
in the South China Sea. The paper is to study the borehole profiles for shallow
strata of coral reefs in the South China Sea, especially in the hydrodynamic marine
environment?, and to establish a geological model for numerical simulation with
Geo-Studio software. Five drilling holes show a six-layer shallow structure of South
China Sea, including filling layer, mid-coarse sand, coral sand gravel, fine sand,
limestone debris and reef limestone. The shallow coral reef profile next to lagoon
is similar to “layers cake”, in which the right side close to the sea is analogous
to “block cake”. The simulation results show that coral reef stability depends on
wave loads and earthquake strength, as well as the physical properties of coral reefs
themselves. The safety factor of the outer reef is greater than 10.0 in the static condition,
indicating that outer reefs are less affected by the wave and earthquake. However, the
safety factor next to lagoon is ranging from 0.1 to 4.9. The main reason for the
variations that the strata of coral reefs close to the sea are thick. For example, the
thickness of reef limestone is more than 10 m and equivalent to the block. When the
thickness of inside strata is less than 10 m, they show weak engineering geological
characteristics. These findings can provide useful information for coral reef constructions in
future.
This work was funded by National Basic Research Program of China (contract:
2013CB956104) and National Natural Science Foundation of China (contract: 41376063). |
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