Relationship between sound velocity and physical mechanical properties of seafloor sediments in controlled three axis stress-strain

Long Jianjun; Zhou Huajian; Li Ganxian; Chen Cong

doi:10.3969/j.issn.0253-4193.2016.09.005

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Long Jianjun, Zhou Huajian, Li Ganxian, Chen Cong. Relationship between sound velocity and physical mechanical properties of seafloor sediments in controlled three axis stress-strain[J]. Haiyang Xuebao, 2016, 38(9): 46-53. doi: 10.3969/j.issn.0253-4193.2016.09.005

Citation:

Long Jianjun, Zhou Huajian, Li Ganxian, Chen Cong. Relationship between sound velocity and physical mechanical properties of seafloor sediments in controlled three axis stress-strain[J]. Haiyang Xuebao, 2016, 38(9): 46-53. doi: 10.3969/j.issn.0253-4193.2016.09.005

Citation:

Long Jianjun, Zhou Huajian, Li Ganxian, Chen Cong. Relationship between sound velocity and physical mechanical properties of seafloor sediments in controlled three axis stress-strain[J]. Haiyang Xuebao, 2016, 38(9): 46-53. doi: 10.3969/j.issn.0253-4193.2016.09.005

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Relationship between sound velocity and physical mechanical properties of seafloor sediments in controlled three axis stress-strain

doi: 10.3969/j.issn.0253-4193.2016.09.005

1.
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
2.
Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2015-12-10
Rev Recd Date: 2016-03-26

Abstract

Abstract

The sediment cores, from shallow seafloor in depth of 100-400 meters (about 2 m depth buried) in an area of the South China Sea, have been performed a simultaneous triaxial strain-acoustic measurement near seabed water pressure. The results show that the sediment longitudinal wave velocity has two characteristics: (1) the longitudinal wave velocity in sediments keeps changing in the process of strain applied from start to end; (2) the average of the speed of sound changes from large to small and then from small to large with the average of the static elastic modulus increasing, and there is a minimum during the course of the average of the speed of sound change. These results are related to physical and mechanical properties and confining pressure of the shallow seafloor sediments, and the changes of the state in which particles of these sediments combine together. In addition, sediment dynamic elastic modulus and porosity has a good negative correlation, and that results from increases of the water content with increases of porosity. Dynamic elastic modulus is 10 to 100 times the static elastic modulus, since the large difference between the strain magnitude resulted from triaxial strain-test and the one generated by wave vibrations is primarily related to that. Two empirical formulas of dual complex parameters-velocity and porosity-velocity were established with the experimentally measured data in this paper. The analysis of results shows that the error in sound speed predicted by the formula of composite double parameters-velocity is approximately a quarter of that predicted by the formula of the porosity-velocity, and it shows that the formula of composite double parameters-velocity is more effective.
- South China Sea,
- seafloor sediment,
- sound velocity,
- three axis stress-strain,
- empirical formula

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References

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