内孤立波浅化破碎过程斜坡沉积物孔压响应特征实验分析

乔路正; 郭秀军; 田壮才; 余乐

doi:10.3969/j.issn.0253-4193.2018.01.008

内孤立波浅化破碎过程斜坡沉积物孔压响应特征实验分析

doi: 10.3969/j.issn.0253-4193.2018.01.008

1.
中国海洋大学环境科学与工程学院, 山东青岛 266100
2.
中国海洋大学环境科学与工程学院, 山东青岛 266100;山东省海洋环境地质工程重点实验室, 山东青岛 266100

基金项目: 国家自然科学基金重大科研仪器研制项目（41427803），国家自然科学基金（41772307）、国家重点研发项目（2017YFC0307701）。

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出版历程
- 收稿日期: 2017-06-29

Experimental analysis of pore pressure characteristics of slope sediments by shoaling internal solitary waves

1.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China

摘要

摘要: 观测资料显示内孤立波沿斜坡浅化过程对海底沉积物的作用犹如一台水中吸尘器，在破碎转换阶段达到最强，甚至会触发一系列地质活动，引发地质灾害。为界定此过程中沉积物的动力响应特征和影响因素，在大型重力式分层流水槽中模拟不同振幅内孤立波和不同类型沉积物斜坡连续作用过程，利用孔隙水压力采集系统实时记录孔隙水压力变化，对比分析不同水动力、坡度、沉积物类型情况下沉积物中超孔压变化特征。分析结果表明，内孤立波破碎过程，破波位置海床表层波压力和不同深度超孔隙水压力都存在相似的"U"型负压力变化过程；破碎波经过位置沉积物表现为和表面波压力正相关的孔压响应特征。破碎点沉积物中超孔压幅值随深度减小，约在6%波长深度位置减少到坡面压力的50%。超孔压幅值和内孤立波振幅、沉积物类型和斜坡度密切相关，坡度由0.071变化到0.160时，波压力幅值可增大至1.6倍。内孤立波振幅变化不影响不同类型海床土动力响应规律，只与超孔隙水压力值大小有关，内孤立波对海床的动力作用可认为弹性作用。
- 内孤立波 /
- 破碎转换 /
- 超孔隙水压力 /
- 影响因素
Abstract: Observation shows that the effect of the internal solitary waves (ISWs) along the slope on the seabed sediments is like a water cleaner, which is the strongest in the crushing phase and even triggers a series of geological activities and disasters. In order to define the dynamic capability and influencing factors of the ISWs in the process, continuous interaction between the different amplitudes solitons and the different types of sediments was simulated in the large gravity stratified flow tank. The changes of pore water pressure in the process were recorded by the pore water pressure acquisition system. The pore pressure in sediments were compared and analyzed under different hydrodynamic, slope and sedimentary types. The results show that there are similar "U" negative excess pore water pressure changes in the process of wave breaking in different wave broken points. The location waves passing through shows a pore pressure response and it is positively correlated with the surface wave pressure. The amplitude of the excess pore water pressure with depth at the solitary wave broken point, which is reduced to about 50% at about 6% of the wavelength. The amplitude of pore pressure is related to sediment type and wave amplitude. When the slope changes from 0.071 to 0.160, the wave pressure amplitude can be increased to 1.6 times. The change of the amplitude of the solitary wave is only related to the excess pore water pressure value, which does not affect the dynamic response of the seabed.
- internal solitary waves /
- broken conversion /
- excess pore water pressure /
- influencing factors

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参考文献(18)

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