Correlation Between Sediment Acoustics and Geotechnical Properties in Jiaozhou Bay

doi:10.3969/j.issn.1674-0696.2017.05.11

Abstract

Abstract: Sediment columnar samples were collected from coastal areas of Jiaozhou Bay to conduct the measurement of acoustics and physical and mechanical properties, together with in-situ measurement of mechanical properties. Mathematical statistics was used to analyze the sediment acoustics and physical and mechanical properties of different types of sediments in the above sea. The study demonstrates that a significant discrepancy of compression wave speed and shear wave speed exists in different types of sediments at coastal areas of Jiaozhou Bay. Among them, compression wave speed and shear wave speed of silty sand are the highest. The compression wave speed of clayed sand, sandy silt, sandy clay, and silty clay take the secondary place, and that of clay is the lowest. The discrepancy of compression wave speed is generally lower than 50 m/s and shear wave speed is generally lower than 20 m/s for the same type of sediments. The variation rule of the dynamic elasticity modulus and dynamic shear modulus of different types of marine sediments is basically accordant with the acoustics properties, but with a non-obvious variation. There is a good quadric relationship between sediment acoustics and physical properties, and the relevance degree between acoustics and physical properties is obviously higher than sediment mechanical properties. In addition, within the range of the measured parameters of sediment physical and mechanical properties, sediment compression wave speed and shear wave speed are increased with the increase of sediment bulk density and strength, while decreased with the increase of sediment water content and porosity.

Key words: geotechnical engineering, sediments, acoustics, physical properties, mechanical properties

摘要： 基于胶州湾近岸海洋沉积物柱状样品声学物理与力学性质实验室测量计算与原位力学性质测量等方法，采用数理统计分析方法对该海域不同类型沉积物声学物理力学性质开展了实验研究。研究结果表明：胶州湾近岸不同类型沉积物压缩波速与剪切波速差异明显。其中，粉砂质砂压缩波速与剪切波速最高，黏土质砂、砂质粉砂、砂质黏土、粉砂质黏土压缩波速次之，黏土最低；同一类型沉积物压缩波速差值普遍低于50 m/s，剪切波速差值普遍低于20 m/s；不同类型沉积物动弹性模量与动剪切模量的变化规律与声学性质基本一致，但其变化趋势不显著；沉积物声学性质与物理力学性质指标间表现为良好的二次函数关系，声学性质与物理性质间的相关程度显著高于力学性质，在测试指标量值范围内，沉积物压缩波速与剪切波速随沉积物容重与强度的增长而增长，随沉积物含水量与孔隙度的增长而降低。

关键词: 岩土工程, 沉积物, 声学, 物理性质, 力学性质

CLC Number:

O319.56

ZHENG Jiewen1, LIU Baohua2, KAN Guangming3, LIU Xiaolei4, LI Guanbao3, PEI Yanliang3. Correlation Between Sediment Acoustics and Geotechnical Properties in Jiaozhou Bay[J]. Journal of Chongqing Jiaotong University(Natural Science), 2017, 36(5): 57-63.

郑杰文1，刘保华2，阚光明3，刘晓磊4，李官保3，裴彦良3. 胶州湾沉积物声学与岩土工程性质关系研究[J]. 重庆交通大学学报（自然科学版）, 2017, 36(5): 57-63.

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