| 波浪导致黄河口海床沉积物超孔压响应现场试验研究 |
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| 引用本文： | 刘晓磊,贾永刚,郑杰文.波浪导致黄河口海床沉积物超孔压响应现场试验研究[J].岩土力学,2015,36(11):3055-3062. |
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| 作者姓名： | 刘晓磊 贾永刚 郑杰文 |
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| 作者单位： | 1. 中国海洋大学 环境科学与工程学院 山东省海洋环境地质工程重点实验室，山东 青岛 266100； 2. 国家海洋局第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室，山东 青岛 266061 |
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| 基金项目： | 国家自然科学基金资助项目（No.41402253、No.41272316、No. 41427803）；中国博士后科学基金资助项目（No.2014M561963）。 |
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| 摘 要： | 黄河口海床特殊的工程地质性质与复杂的工程动力稳定性问题，均与海床沉积物在波浪荷载作用下的孔压动力响应密切相关。在现代黄河水下三角洲潮间带岸滩选择4个典型研究点，现场模拟波浪作用对原状海床沉积物实施循环加载，利用孔隙水压力观测、沉积物强度测试、样品采集与实验室土工测试等方法手段，测定黄河口原状海床沉积物在循环荷载作用不同阶段的孔压响应与强度变化。研究发现，黄河口原状海床沉积物在经历循环加载过程中，典型的超孔压响应可分为逐渐累积、部分消散、快速累积、累积液化和完全消散5个阶段，分别对应沉积物强度的衰减、增大、衰减、丧失和恢复过程，沉积物的粒度组成与结构性强弱决定了超孔压的具体响应模式。波浪导致原状海床液化深度受沉积物的干密度、孔隙比、饱和度等初始物理性质影响显著，细颗粒组分的相对含量高低也在很大程度上控制着沉积物的液化特性。
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| 关 键 词： | 海床沉积物 超孔压 液化 土力学 黄河口 |
| 收稿时间： | 2015-07-16 |
In situ experiment of wave-induced excess pore pressure in the seabed sediment in Yellow River estuary |
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| LIU Xiao-lei,JIA Yong-gang,ZHENG Jie-wen.In situ experiment of wave-induced excess pore pressure in the seabed sediment in Yellow River estuary[J].Rock and Soil Mechanics,2015,36(11):3055-3062. |
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| Authors: | LIU Xiao-lei JIA Yong-gang ZHENG Jie-wen |
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| Institution: | (1. Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, College of Environmental Science and Engineering, Ocean University of China, Qingdao, Shandong 266100, China; 2. Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, SOA, Qingdao, Shandong 266061, China |
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| Abstract: | Both the special engineering geological properties and the complex engineering dynamic stability problems are closely related to the wave-induced dynamic response of pore pressure in seabed sediment in the Yellow River estuary. Four typical sites on the intertidal flats of the Yellow River delta are selected to simulate the wave action on the intact seabed sediments. Various testing methods, such as pore water piezometer test, field sediment strength test and sampling/laboratory geotechnical experiments, are employed to determine the variations in pore pressure and strength of the undisturbed seabed sediments at different stages under the cyclic loading. It is shown that during the cyclic loading process, the excess pore pressure response of undisturbed seabed sediment can be separated into 5 stages including gradual accumulation, partial dissipation, rapid accumulation, accumulated liquefaction and complete dissipation, which correspond to five processes of sediment strength variation including attenuation, increase, attenuation, loss and recovery, respectively. The grain size composition and structural strength dominate the excess pore pressure response. The wave-induced liquefied depth of intact seabed sediment is significantly affected by the initial physical properties such as dry density, void ratio, saturation degree, etc. To a large extent, the relative amount of fine grained components also controls the liquefaction characteristics of sediment in the Yellow River estuary. |
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| Keywords: | seabed sediment excess pore pressure liquefaction soil mechanics Yellow River estuary |
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