南沙海区珊瑚礁灰岩纵波波速特征及其影响因素 *

doi:10.11978/2020015

Abstract

Abstract:

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

CLC Number:

P736.32

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.

Figures/Tables 14

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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

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

P-wave velocity properties and its influencing factors of coral reef limestone in Nansha area

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