基于分布式光纤传感技术的新旧路基沉降变形监测研究
发布时间：2018-11-02 17:45
【摘要】：在道路拓宽工程中，新旧路基固结时间不同，沉降差异较大，新老道路结合部容易出现路面破坏，给行驶车辆造成不便和安全威胁，有高大边坡支护的拓宽道路更加明显。因此对新旧路基进行监测并得到其沉降规律十分必要。但是传统的路基沉降监测仪器多为点式监测，不能对路基连续实时监测，自动化水平低，工作量大。分布式光纤传感技术不仅可以解决这些问题，还具有远距离、智能化监测等特点。所以基于BOTDR技术对新旧路基沉降变形进行监测具有十分重要的意义。该文主要研究内容及结论如下： 1.以光纤传感技术为基础，对两种光纤进行温度、应变标定，得到两种光纤的温度、应变传感系数；通过对比分析两种光纤的灵敏度，得到影响光纤灵敏度的因素。 2.介绍了BOTDR技术的原理，设计出一种基于BOTDR技术监测路基沉降的方案。 3.室内建立拓宽道路模型，按设计监测方案埋设两种光纤，并结合百分表验证了两种光纤监测土体、碎石沉降的可行性，检验了光纤与土工布的同步变形能力。接着在模型上进行堆载，，每隔一段时间读取光纤与百分表的监测数据，通过数据处理分析，得到新旧路基沉降变形规律。 4.以有限元分析方法为基础，结合某拓宽道路的相关参数，运用ABAQUS有限元软件对典型工程断面进行分析，得到新旧路基沉降变形规律及主要影响因素。 5.将光纤实测新旧路基沉降变形规律与有限元计算结果对比分析表明：两者基本一致。 6.根据有限元模拟结果，在青岛市某道路拓宽工程中，选取一些易发生新老路基差异沉降的断面，埋设传感光缆和常规监测仪器，验证了BOTDR技术监测拓宽道路的工程可行性。
[Abstract]:In the road widening project, the consolidation time of the new and old subgrade is different, the settlement difference is big, the road surface destruction is easy to appear in the junction part of the new road and the old road, which causes inconvenience and safety threat to the driving vehicle, and the widening road with high slope support is more obvious. Therefore, it is necessary to monitor the new and old subgrade and obtain its settlement law. However, the traditional monitoring instruments for subgrade settlement are mostly point-based monitoring, which can not monitor subgrade continuously in real time, and the automation level is low, and the workload is large. Distributed optical fiber sensing technology can not only solve these problems, but also has the characteristics of long distance, intelligent monitoring and so on. So it is very important to monitor the settlement of new and old subgrade based on BOTDR technology. The main contents and conclusions are as follows: 1. Based on the optical fiber sensing technology, the temperature and strain sensing coefficients of the two kinds of optical fibers are obtained by calibrating the temperature and strain of the two kinds of optical fibers, and the factors influencing the sensitivity of the two kinds of optical fibers are obtained by comparing and analyzing the sensitivity of the two kinds of optical fibers. 2. This paper introduces the principle of BOTDR technology and designs a scheme of monitoring subgrade settlement based on BOTDR technology. 3. The indoor widening road model was built and two kinds of optical fibers were embedded according to the design and monitoring scheme. The feasibility of monitoring soil mass and gravel settlement with two kinds of optical fibers was verified by combining with the percentile, and the synchronous deformation ability of optical fiber and geotextile was tested. After that, the monitoring data of optical fiber and percentile are read every other time on the model, and the settlement and deformation law of new and old subgrade is obtained through data processing and analysis. 4. Based on the finite element analysis method and the related parameters of a widening road, the typical engineering section is analyzed by using ABAQUS finite element software, and the settlement and deformation law of the new and old subgrade and the main influencing factors are obtained. 5. Comparing and analyzing the settlement and deformation law of new and old roadbed measured by optical fiber and finite element analysis, it is shown that the two are basically the same. 6. According to the results of finite element simulation, in a road widening project in Qingdao, some sections which are prone to the differential settlement of new and old subgrade are selected, and the sensing cables and conventional monitoring instruments are embedded, which verifies the engineering feasibility of BOTDR technology to monitor the widening of road.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
本文编号：2306498
[Abstract]:In the road widening project, the consolidation time of the new and old subgrade is different, the settlement difference is big, the road surface destruction is easy to appear in the junction part of the new road and the old road, which causes inconvenience and safety threat to the driving vehicle, and the widening road with high slope support is more obvious. Therefore, it is necessary to monitor the new and old subgrade and obtain its settlement law. However, the traditional monitoring instruments for subgrade settlement are mostly point-based monitoring, which can not monitor subgrade continuously in real time, and the automation level is low, and the workload is large. Distributed optical fiber sensing technology can not only solve these problems, but also has the characteristics of long distance, intelligent monitoring and so on. So it is very important to monitor the settlement of new and old subgrade based on BOTDR technology. The main contents and conclusions are as follows: 1. Based on the optical fiber sensing technology, the temperature and strain sensing coefficients of the two kinds of optical fibers are obtained by calibrating the temperature and strain of the two kinds of optical fibers, and the factors influencing the sensitivity of the two kinds of optical fibers are obtained by comparing and analyzing the sensitivity of the two kinds of optical fibers. 2. This paper introduces the principle of BOTDR technology and designs a scheme of monitoring subgrade settlement based on BOTDR technology. 3. The indoor widening road model was built and two kinds of optical fibers were embedded according to the design and monitoring scheme. The feasibility of monitoring soil mass and gravel settlement with two kinds of optical fibers was verified by combining with the percentile, and the synchronous deformation ability of optical fiber and geotextile was tested. After that, the monitoring data of optical fiber and percentile are read every other time on the model, and the settlement and deformation law of new and old subgrade is obtained through data processing and analysis. 4. Based on the finite element analysis method and the related parameters of a widening road, the typical engineering section is analyzed by using ABAQUS finite element software, and the settlement and deformation law of the new and old subgrade and the main influencing factors are obtained. 5. Comparing and analyzing the settlement and deformation law of new and old roadbed measured by optical fiber and finite element analysis, it is shown that the two are basically the same. 6. According to the results of finite element simulation, in a road widening project in Qingdao, some sections which are prone to the differential settlement of new and old subgrade are selected, and the sensing cables and conventional monitoring instruments are embedded, which verifies the engineering feasibility of BOTDR technology to monitor the widening of road.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
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