| 孔压探杆贯入及潮汐作用下超孔压响应规律研究 |
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| 引用本文： | 刘涛,魏冠立,寇海磊,郭磊.孔压探杆贯入及潮汐作用下超孔压响应规律研究[J].海洋学报(英文版),2019,38(7):107-113. |
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| 作者姓名： | 刘涛 魏冠立 寇海磊 郭磊 |
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| 作者单位： | 中国海洋大学, 山东省海洋环境地质工程重点实验室, 青岛, 266100;青岛海洋科学与技术国家实验室, 海洋地质过程与环境功能实验室, 青岛, 266061,中国海洋大学, 山东省海洋环境地质工程重点实验室, 青岛, 266100,中国海洋大学, 山东省海洋环境地质工程重点实验室, 青岛, 266100;中国海洋大学, 工程学院, 青岛, 266100,山东大学, 海洋研究院, 青岛, 266237 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41672272 and 41427803; the Science and Technology Development Project of Shandong, China under contract No. 2017GGX30125; the Guangzhou Marine Geological Survey Entrustment Project under contract No. 2017C-03-162. |
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| 摘 要： | Excess pore water pressure is an important parameter that can be used to analyze certain physical characteristics of sediment. In this paper, the excess pore water pressure of subseafloor sediment and its variation with tidal movement was measured following the installation of a wharf in Qingdao, China by using a fiber Bragg grating(FBG) piezometer. The results indicated that this FBG piezometer is effective in the field. The measured variation of excess pore water pressure after installation is largely explained by the dissipation of excess pore water pressure. The dissipation rate can be used to estimate the horizontal consolidation coefficient, which ranged from1.3×10~(–6) m~2/s to 8.1×10~(–6) m~2/s. The measured values during tidal phases are associated with the variability of tidal pressure on the seafloor and can be used to estimate the compressibility and the permeability of the sediment during tidal movement. The volume compression coefficient estimated from tidal oscillation was approximately2.0×10~(–11) Pa~(–1), which was consistent with the data from the laboratory test. The findings of this paper can provide useful information for in situ investigations of subseafloor sediment.
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| 关 键 词： | 孔隙水压力 现场观测 贯入过程 潮汐作用 |
| 收稿时间： | 2018/9/28 0:00:00 |
Pore pressure observation: pressure response of probe penetration and tides |
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| Liu Tao,Wei Guanli,Kou Hailei and Guo Lei.Pore pressure observation: pressure response of probe penetration and tides[J].Acta Oceanologica Sinica,2019,38(7):107-113. |
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| Authors: | Liu Tao Wei Guanli Kou Hailei and Guo Lei |
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| Institution: | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China;Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China,Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China,Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China;College of Engineering, Ocean University of China, Qingdao 266100, China and Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China |
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| Abstract: | Excess pore water pressure is an important parameter that can be used to analyze certain physical characteristics of sediment. In this paper, the excess pore water pressure of subseafloor sediment and its variation with tidal movement was measured following the installation of a wharf in Qingdao, China by using a fiber Bragg grating (FBG) piezometer. The results indicated that this FBG piezometer is effective in the field. The measured variation of excess pore water pressure after installation is largely explained by the dissipation of excess pore water pressure. The dissipation rate can be used to estimate the horizontal consolidation coefficient, which ranged from 1.3×10–6 m2/s to 8.1×10–6 m2/s. The measured values during tidal phases are associated with the variability of tidal pressure on the seafloor and can be used to estimate the compressibility and the permeability of the sediment during tidal movement. The volume compression coefficient estimated from tidal oscillation was approximately 2.0×10–11 Pa–1, which was consistent with the data from the laboratory test. The findings of this paper can provide useful information for in situ investigations of subseafloor sediment. |
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| Keywords: | pore pressure in situ observation penetration tidal load |
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