| Liu Tao,Wei Guanli,Kou Hailei,Guo Lei. 2019. Pore pressure observation: pressure response of probe penetration and tides. Acta Oceanologica Sinica, 38(7):107－113 |
| Pore pressure observation: pressure response of probe penetration and tides |
| 孔压探杆贯入及潮汐作用下超孔压响应规律研究 |
| Received:September 28, 2018 |
| DOI：10.1007/s13131-019-1462-4 |
| Key words:pore pressure in situ observation penetration tidal load |
| 中文关键词: 孔隙水压力 现场观测 贯入过程 潮汐作用 |
| 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. |
| Author Name | Affiliation | E-mail | | Liu Tao | 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 | ltmilan@ouc.edu.cn | | Wei Guanli | Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China | | | Kou Hailei | 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 | | | Guo Lei | 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. |
| 中文摘要: |
| 超孔压是分析海洋沉积物物理特征的重要参数。本论文通过布放光纤布拉格光栅（FBG）孔压探杆监测了青岛某码头探杆贯入及潮汐作用下海床的超孔压变化。结果表明，FBG孔压探杆具有良好的现场应用效果。贯入后实测的超孔压消散速率用于估算沉积物的水平固结系数，估算结果为1.3×10-6 m2·s-1至8.1×10-6 m2·s-1。潮汐阶段的超孔压测量值与潮汐作用在海床面的压力有关，用于估算沉积物的压缩性和渗透性，海床体积压缩系数估算值为2.0×10-11 Pa-1，与实验室试验结果一致。本文的研究可为海底沉积物的原位调查提供有用的资料。 |
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