光纤光栅传感器在海床超孔压监测中的适用性研究
发布时间：2018-07-14 10:27
【摘要】：在人类迫切需要认识、研究海洋和吴立新院士“透明海洋”战略计划提出的大背景下,海底地质灾害相关研究也愈发成为各界人士关注的热点问题之一。而海底孔隙水压力作为一项反映海底地质灾害发生过程中的重要参数,其监测工作的重大意义不言而喻。现在,传统的传感器由于各种缺点很难应用于海底超孔隙水压力监测方面,而光纤光栅传感器由于其抗电磁干扰、抗腐蚀、电绝缘、高灵敏度和低成本以及与普通光纤良好的兼容性等优点被越来越广泛地应用。同时,压差式超孔隙水压力传感器由于其能在深海海底直接测得超孔隙水压力值,故其发展对海底地质灾害的监测起到至关重要的作用。本论文围绕光纤光栅传感器在海底超孔隙水压力监测方面的应用研究,开展了以下几个方面的工作。(1)概述了海底(超)孔隙水压力理论和监测的研究现状和光纤光栅传感器的研究现状,详细介绍了光纤光栅传感器的原理和优势。(2)研制了光纤光栅超孔隙水压力传感器,过程中对光纤材料的耐腐蚀性和耐压性能进行了试验。试验结果表明光纤材料在高压、腐蚀条件下具有稳定的波长值,涂覆光纤光栅比裸露的光纤光栅材料具有更强的稳定性,所以选择涂覆光纤材料,其在高压和腐蚀条件下完全能够满足深海超孔隙水压力传感器的材料要求。研制出的光纤光栅超孔隙水压力传感器标定拟合曲线R2能达到0.9999,线性良好。(3)设计与研制了配套的搭载光纤光栅超孔隙水压力传感器的探杆及其监测系统,并对搭载光纤光栅超孔隙水压力传感器的探杆进行了灵敏性试验,室内水槽试验来模拟海底环境验证其实用性。数据分析显示,光纤光栅超孔隙水压力传感器不仅能够与试验过程中传统的压阻式传感器的监测结果相吻合,同时也体现了良好的稳定性和高灵敏度的特性,验证了光纤光栅传感器在超孔隙水压力监测领域的应用是成功的尝试。(4)对试验数据进行了全面分析,结果验证了相关理论。通过人工造波和人工施加振动荷载两种方式使“海床”产生超孔隙水压力,并通过传统的压阻式孔隙水压力传感器、土压力传感器和光纤光栅传感器监测“海床”产生超孔隙水压力的情况。监测结果验证了弹性海床动力响应的相关结论：海床超静孔隙水压力的幅值随深度的增加而减小,有效应力幅值在海床表面下较浅区域内达到最大值；与海床表面波压力相比,海床内孔隙水压力和有效应力通常存在相位迟滞现象。应认识到,本论文做的工作仅仅是光纤光栅传感器在海床超孔隙水压力监测方面起步阶段的尝试工作,大量相关研究亟待开展,结合实际监测需要,不断改进光纤光栅传感器在超孔隙水压力监测方面的技术和设备,使该技术从实验室走向实际应用,必定会为科研和生产带来巨大的推动。
[Abstract]:Under the background of the strategic plan of "transparent Ocean" proposed by academician Wu Lixin and the urgent need to understand, the research on submarine geological hazards has become one of the hot issues that people from all walks of life pay more and more attention to. As an important parameter to reflect the process of submarine geological disasters, the monitoring work of pore water pressure is of great significance. Nowadays, traditional sensors are difficult to be used in monitoring the pressure of sea floor pore water due to their various shortcomings, while fiber Bragg grating sensors are resistant to electromagnetic interference, corrosion resistance and electrical insulation. The advantages of high sensitivity, low cost and good compatibility with common optical fiber are more and more widely used. At the same time, the development of pressure differential super-pore water pressure sensor plays an important role in monitoring submarine geological hazards because it can directly measure the value of excess pore water pressure on the deep seabed. This paper focuses on the application of fiber Bragg grating sensors in monitoring the pressure of seabed pore water. The following work has been carried out. (1) the research status of the theory and monitoring of the sea floor (excess) pore water pressure and the research status of fiber Bragg grating sensors are summarized. The principle and advantages of fiber Bragg grating sensor are introduced in detail. (2) the fiber Bragg grating super-pore water pressure sensor is developed. During the process, the corrosion resistance and pressure resistance of fiber optic materials are tested. The experimental results show that the fiber material has a stable wavelength value under high pressure and corrosion conditions, and the coated fiber grating material is more stable than the bare fiber grating material. Under the condition of high pressure and corrosion, it can fully meet the material requirements of deep-sea super-pore water pressure sensor. The calibration curve R2 of fiber Bragg grating super-pore water pressure sensor is 0.9999, and the linearity is good. (3) A probe rod and its monitoring system are designed and developed with fiber Bragg grating super-pore water pressure sensor. The sensitivity test of the probe rod carrying fiber Bragg grating (FBG) super-pore water pressure sensor was carried out, and the indoor flume test was used to simulate the seabed environment to verify its practicability. The data analysis shows that the fiber Bragg grating super-pore water pressure sensor can not only accord with the monitoring results of the traditional piezoresistive sensor, but also show good stability and high sensitivity. The application of fiber Bragg grating sensor in the field of pore water pressure monitoring is proved to be a successful attempt. (4) the experimental data are comprehensively analyzed and the relevant theory is verified. The "seabed" is subjected to excess pore water pressure by artificial wave making and vibration loading, and the traditional piezoresistive pore water pressure sensor is used. Earth pressure sensors and fiber Bragg grating sensors monitor the excess pore water pressure in the seabed. The monitoring results verify the relevant conclusions of dynamic response of elastic seabed: the amplitude of excess pore water pressure of seabed decreases with the increase of depth, and the amplitude of effective stress reaches the maximum value in the shallow area below the seabed surface, which is compared with the surface wave pressure of seabed. The pore water pressure and effective stress in the seabed usually have phase hysteresis phenomenon. It should be recognized that the work done in this paper is only a preliminary work of fiber Bragg grating sensors in the initial stage of monitoring the excess pore water pressure of the seabed, and a large number of related studies need to be carried out urgently, combined with the actual monitoring needs. Continuously improving the technology and equipment of fiber Bragg grating sensor in monitoring pore water pressure, making the technology from laboratory to practical application, will certainly bring great impetus to scientific research and production.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP212
本文编号：2121351
[Abstract]:Under the background of the strategic plan of "transparent Ocean" proposed by academician Wu Lixin and the urgent need to understand, the research on submarine geological hazards has become one of the hot issues that people from all walks of life pay more and more attention to. As an important parameter to reflect the process of submarine geological disasters, the monitoring work of pore water pressure is of great significance. Nowadays, traditional sensors are difficult to be used in monitoring the pressure of sea floor pore water due to their various shortcomings, while fiber Bragg grating sensors are resistant to electromagnetic interference, corrosion resistance and electrical insulation. The advantages of high sensitivity, low cost and good compatibility with common optical fiber are more and more widely used. At the same time, the development of pressure differential super-pore water pressure sensor plays an important role in monitoring submarine geological hazards because it can directly measure the value of excess pore water pressure on the deep seabed. This paper focuses on the application of fiber Bragg grating sensors in monitoring the pressure of seabed pore water. The following work has been carried out. (1) the research status of the theory and monitoring of the sea floor (excess) pore water pressure and the research status of fiber Bragg grating sensors are summarized. The principle and advantages of fiber Bragg grating sensor are introduced in detail. (2) the fiber Bragg grating super-pore water pressure sensor is developed. During the process, the corrosion resistance and pressure resistance of fiber optic materials are tested. The experimental results show that the fiber material has a stable wavelength value under high pressure and corrosion conditions, and the coated fiber grating material is more stable than the bare fiber grating material. Under the condition of high pressure and corrosion, it can fully meet the material requirements of deep-sea super-pore water pressure sensor. The calibration curve R2 of fiber Bragg grating super-pore water pressure sensor is 0.9999, and the linearity is good. (3) A probe rod and its monitoring system are designed and developed with fiber Bragg grating super-pore water pressure sensor. The sensitivity test of the probe rod carrying fiber Bragg grating (FBG) super-pore water pressure sensor was carried out, and the indoor flume test was used to simulate the seabed environment to verify its practicability. The data analysis shows that the fiber Bragg grating super-pore water pressure sensor can not only accord with the monitoring results of the traditional piezoresistive sensor, but also show good stability and high sensitivity. The application of fiber Bragg grating sensor in the field of pore water pressure monitoring is proved to be a successful attempt. (4) the experimental data are comprehensively analyzed and the relevant theory is verified. The "seabed" is subjected to excess pore water pressure by artificial wave making and vibration loading, and the traditional piezoresistive pore water pressure sensor is used. Earth pressure sensors and fiber Bragg grating sensors monitor the excess pore water pressure in the seabed. The monitoring results verify the relevant conclusions of dynamic response of elastic seabed: the amplitude of excess pore water pressure of seabed decreases with the increase of depth, and the amplitude of effective stress reaches the maximum value in the shallow area below the seabed surface, which is compared with the surface wave pressure of seabed. The pore water pressure and effective stress in the seabed usually have phase hysteresis phenomenon. It should be recognized that the work done in this paper is only a preliminary work of fiber Bragg grating sensors in the initial stage of monitoring the excess pore water pressure of the seabed, and a large number of related studies need to be carried out urgently, combined with the actual monitoring needs. Continuously improving the technology and equipment of fiber Bragg grating sensor in monitoring pore water pressure, making the technology from laboratory to practical application, will certainly bring great impetus to scientific research and production.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP212
【相似文献】
相关期刊论文 前1条
1 许波;吴继敏;许礼;彭森良;胡嫣然;;潮水位及堆填速率对超孔隙水压力消散影响研究[J];工程地质计算机应用;2008年03期
相关会议论文 前6条
1 王怀忠;;打入桩的桩端超孔隙水压力引起的沉降[A];第十三届全国结构工程学术会议论文集（第Ⅱ册）[C];2004年
2 黄清和;江宇渊;简浩洋;;软土的超孔隙水压力排水固结研究[A];2011年全国工程地质学术年会论文集[C];2011年
3 戴金林;蒋磊;;振动挤密砂桩处理地基地面沉降估算[A];地基处理理论与实践——第七届全国地基处理学术讨论会论文集[C];2002年
4 邹新军;赵明华;杨眉;;CFG桩施工超孔隙水压力及复合地基固结度计算[A];第十届全国岩石力学与工程学术大会论文集[C];2008年
5 董志良;颜永国;黄建华;;真空联合堆载预压固结理论在某工程中的应用[A];工程排水与加固技术理论与实践——第七届全国工程排水与加固技术研讨会论文集[C];2008年
6 张加华;王峰;蔡建新;;工程爆破在软土地基处理中的应用[A];第七届全国工程爆破学术会议论文集[C];2001年
相关博士学位论文 前1条
1 张小玲;地震作用下海底管线及周围海床动力响应分析[D];大连理工大学;2009年
相关硕士学位论文 前7条
1 刘林;车载作用下含孔充水混凝土路面动态响应分析[D];石家庄铁道大学;2015年
2 西国庚;粉土中超孔隙水压力对桩基p-y曲线的影响[D];中国海洋大学;2015年
3 李洪利;光纤光栅传感器在海床超孔压监测中的适用性研究[D];中国海洋大学;2015年
4 周碧辉;地震作用下超孔隙水压力对土石坝稳定安全影响分析[D];昆明理工大学;2010年
5 马红;考虑群罐效应的储罐地基应力及变形分析[D];中国石油大学;2011年
6 徐祖阳;PHC管桩沉桩引起的超孔隙水压力研究[D];河海大学;2006年
7 董伟;海洋工程后继打桩可打入性研究[D];天津大学;2006年
，本文编号：2121351
本文链接：https://www.wllwen.com/shoufeilunwen/xixikjs/2121351.html
