郑杰文, 刘保华, 阚光明, 杨志国, 华清峰, 李官保. 2015: 胶州湾潮滩沉积物剪切波速及其频散特性研究. 工程地质学报, 23(s1): 205-212. DOI: 10.13544/j.cnki.jeg.2015.s1.033
    引用本文: 郑杰文, 刘保华, 阚光明, 杨志国, 华清峰, 李官保. 2015: 胶州湾潮滩沉积物剪切波速及其频散特性研究. 工程地质学报, 23(s1): 205-212. DOI: 10.13544/j.cnki.jeg.2015.s1.033
    ZHENG Jiewen, LIU Baohua, KAN Guangming, YANG Zhiguo, HUA Qingfeng, LI Guanbao. 2015: SHEAR WAVE VELOCITY AND FREQUENCY DEPANDENCY OF TIDAL FLAT SEDIMENTS IN JIAOZHOU BAY. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 205-212. DOI: 10.13544/j.cnki.jeg.2015.s1.033
    Citation: ZHENG Jiewen, LIU Baohua, KAN Guangming, YANG Zhiguo, HUA Qingfeng, LI Guanbao. 2015: SHEAR WAVE VELOCITY AND FREQUENCY DEPANDENCY OF TIDAL FLAT SEDIMENTS IN JIAOZHOU BAY. JOURNAL OF ENGINEERING GEOLOGY, 23(s1): 205-212. DOI: 10.13544/j.cnki.jeg.2015.s1.033

    胶州湾潮滩沉积物剪切波速及其频散特性研究

    SHEAR WAVE VELOCITY AND FREQUENCY DEPANDENCY OF TIDAL FLAT SEDIMENTS IN JIAOZHOU BAY

    • 摘要: 沉积物剪切波速是海底沉积声学研究的重要因素之一, 是海洋工程地质勘查工作中必要的物理参数, 与沉积物物理力学性质具有密切关系。本文在胶州湾采集沉积物样品, 采用弯曲元测试系统进行不同频率剪切波速测试, 结合沉积物物理性质测试, 研究胶州湾沉积物剪切波速及其频散特性与物理性质相关性。研究结果表明在250~2000Hz测试频率范围内, 沉积物剪切波速为26.5~103.5ms-1, 砂土剪切波速最高, 粉土次之, 黏土和粉质黏土则偏低, 沉积物剪切波速表现出明显频散特性, 剪切波速随测试频率增加表现出对数增长趋势, 频散因子为0.3~31.1, 频散度为1.1%~103.8%, 受沉积物类型影响显著, 沉积物剪切波速、频散因子和频散度与沉积物物理性质间存在不同相关程度的一元二次函数关系, 三者间表现为一致的变化规律, 但频散度与物理性质间的统计关系相关程度明显偏低。

       

      Abstract: Shear wave velocity is the important factor in seafloor acoustics, and the essential parameter in marine engineering geological exploration, which has close relationship with sediment physical properties. Samples were collected from Jiaozhou Bay to conduct shear wave velocity measurement by bender element system, and construct the correlation between shear wave velocity and frequency dispersion and physical parameters. Results present that shear wave velocity ranges from 26.5 to 103.5ms-1 at the frequency from 250Hz to 2000Hz; sandy sediment was characterized by the maximum shear wave velocity, silty sediment took second place, and clayed sediment and silty clay sediment has the low shear wave velocity; obvious frequency dispersion is found at the measuring frequency of shear wave velocity, and logarithmic growth function can describe the relationship between shear wave velocity and measuring frequency; dispersion factor ranges from 0.3 to 31.1, and PFE(percent frequency effect) ranges from 1.1%to 103.8%, which is affected by sediment types; hypo-two function can describe the relationship between shear wave velocity, dispersion factor, PFE and sediment physical parameters with different correlation degree but consistent variation trend; comparatively speaking, it is obvious low for the correlation degree between PFE and sediment physical parameters.

       

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