Analysis on acoustic velocity characteristics of sediments in the northern slope of the South China Sea
Analysis on acoustic velocity characteristics of sediments in the northern slope of the South China Sea
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DOI：
10.1007/s10064-017-1070-z
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发表时间：
2018-08
影响因子：
4.2
通讯作者：
Qingsheng Meng;Shengbiao Liu;Y. Jia;Z. Xiao;Xinzhi Wang
中科院分区：
文献类型：
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作者：
Qingsheng Meng;Shengbiao Liu;Y. Jia;Z. Xiao;Xinzhi Wang
为了解南海北方陆坡沉积物中声速的空间分布特征，采用超声波技术对沉积物柱状样的垂直和水平声速进行了测量。结合沉积物物理力学性质的测试结果，分析了声速与沉积物物理性质的关系。研究结果表明，同一深度不同测站的声速呈现不规则变化，总体上垂直方向的声速大于水平方向的声速。对于不同的采样站和不同的深度，声波速度表现出很大的变化，他们表现出很大的差异，有垂直和水平速度之间几乎没有关系。此外，结果清楚地显示出强烈的各向异性特性之间的声波速度。声速的这种变化是由于研究区海底沉积物物理力学性质的复杂变化造成的。研究结果还表明，测量的声速和预测的声速之间存在较大的偏差。预测结果由经验公式计算，利用单一岩土参数与声速之间的关系。研究成果加深了对研究区沉积物工程地质性质的认识。
To understand the spatial characteristics of the acoustic velocity within sediments in the northern slope of the South China Sea, an ultrasonic technique was employed to measure the vertical and horizontal acoustic velocities of sediment core samples. Combined with the physical and mechanical properties test results of sediments, the relationships between acoustic velocity and physical properties were analyzed. The research results showed that the acoustic velocity presented irregular variations at the same depth among different stations, and that, in general, the acoustic velocities in the vertical direction were greater than those in the horizontal direction. For different sampling stations and different depths, the acoustic velocities showed a great variability; they exhibited large differences and there was almost no relation between the vertical and horizontal velocities. In addition, the results clearly exhibited strong anisotropic characteristic among the acoustic velocities. This variation of acoustic velocity was due to complex changes of physical and mechanical properties of seabed sediments in the study area. The results of the study also showed that there was a large deviation between the measured and the predicted acoustic velocities. The predicted results were calculated by empirical equations using the relationships between single geotechnical parameters and the acoustic velocity. The research results improve the understanding of engineering geological properties of the sediments in the study area.