Journal of Tropical Oceanography >
P-wave velocity properties and its influencing factors of coral reef limestone in Nansha area
Received date: 2020-02-03
Request revised date: 2020-04-07
Online published: 2020-04-07
Supported by
National Natural Science Foundation of China(41976065)
Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13010102)
Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0104)
The 2020 Research Program of Sanya Yazhou Bay Science and Technology City(SKJC-2020-01-012)
Copyright
Coral reef limestone is a kind of rock with complex pore structure and large density variation. The relationships between P-wave velocity and pore structure of coral reef limestone and the influencing factors on acoustic properties, however, are not well studied. The P-wave velocity, porosity, and density of coral reef limestone were measured and analyzed in this study. The results exhibited that the P-wave velocity of coral reef limestone varies between 5104 and 5958 m·s-1, its porosity varies between 1.47% and 17.7%, and its density varies between 2.07 and 2.72 g·cm-3. We showed that the porosity and density in coral reef limestone were determined by compaction and recrystallization. In addition, the porosity and pore structure also had an effect on P-wave velocity in coral reef limestone. More importantly, the structure and stability of coral reef limestone can be determined by the ratio of S-wave and P-wave velocities. The acoustic properties of coral reef limestone can provide important support for the stability of engineering.
Key words: coral reef limestone; P-wave velocity; porosity; pore structure; density
TIAN Yuhang , CHEN Zhong , HUANG Weixia , HOU Zhengyu , YAN Wen , WANG Xuesong . P-wave velocity properties and its influencing factors of coral reef limestone in Nansha area[J]. Journal of Tropical Oceanography, 2021 , 40(1) : 133 -141 . DOI: 10.11978/2020015
表1 礁灰岩样品的纵波、横波波速与孔隙度、密度测试结果Tab. 1 P-wave velocity, S-wave velocity, porosity, and density of the coral reef limestones analyzed |
样品 编号 | 孔深/m | 横波波速/ (m·s-1) | 纵波波速/ (m·s-1) | 孔隙度/% | 密度/ (g·cm-3) |
---|---|---|---|---|---|
1 | 51.41 | 2533 | 5289 | 9.89 | 2.29 |
2 | 303.63 | 3884 | 5958 | 1.47 | 2.72 |
3 | 304.53 | 2822 | 5104 | 17.70 | 2.07 |
4 | 371.03 | 3474 | 5770 | 3.01 | 2.67 |
5 | 741.03 | 3273 | 5151 | 8.24 | 2.48 |
6 | 777.15 | 3317 | 5170 | 6.13 | 2.50 |
7 | 823.25 | 2531 | 5268 | 9.17 | 2.21 |
8 | 849.95 | 3298 | 5185 | 6.68 | 2.48 |
9 | 864.95 | 3300 | 5441 | 5.77 | 2.36 |
10 | 886.45 | 3464 | 5411 | 3.28 | 2.45 |
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