光纤光栅测试技术在边坡工程中的应用

发布时间：2018-06-18 05:38

本文选题：光纤光栅 + 测试技术　；参考：《西南交通大学》2015年硕士论文

【摘要】：随着工程测试技术的不断创新与新形势的要求,光纤光栅测试技术在土木工程的上部结构中得到了很好的应用,它使许多复杂结构的力学测试变得方便可行。而在边坡工程中,由于一些客观因素使得光纤光栅测试技术未能得到很好的应用,但近年来,越来越多的工程专家及学者在探索其在边坡工程中的应用,以实现其在边坡工程应用的普及。1.在边坡工程中,与应力应变有关的常见物理量有坡体位移、锚杆拉力、抗滑桩桩身弯矩等,本文推导了相关光纤光栅测试传感器的理论和温度补偿方法,分析了相关的误差、指出了安装时的注意事项以及其适用情况。2.依托高陡边坡连续强降雨致灾室内模型试验研究,首次将光纤光栅测试技术应用于边坡工程土工离心机试验,特此研发了光纤光栅等强度梁式位移传感器、光纤光栅锚杆测试元件、光纤光栅抗滑桩桩身弯矩测试元件。详细介绍了光纤光栅测试系统和说明了试验过程与试验方法。通过对试验结果的分析,光纤光栅测试技术所测试的数据是符合实际规律的,说明该测试技术是可行的。通过与传统测试方法的对比,可知光纤光栅测试技术精度高,但也有其局限性,需要同传感测试技术相结合应用。3.详细分析了光纤光栅测试技术在实际边坡工程中的应用情况。在宜万铁路边坡工程中,防护及支护结构主要有被动防护网、主动的防护网、锚索、挡土墙和抗滑桩。详细介绍了光纤光栅测试系统以及相关传感器在防护和支护结构上的安装情况,通过对应用的结果分析可知,监测系统运行稳定,有效动态地监测了边坡防护结构及支护结构的各种物理量,从而有效地判断识别出边坡危岩落石的状况及边坡土体的状况,能有效地发出预警及报警信号,保证了铁路的运行安全。光纤光栅测试技术在宜万铁路边坡工程中的成功应用为以后的类似项目提供了很好的参考。在广陕高速中,通过和传统测试技术的对比,可知光纤光栅测试技术所测的数据稳定,规律性强,且可重复使用。通过全文的理论推导分析和与传统测试技术的对比分析,可得出：光纤光栅测试技术尺寸效应小、可靠性高、抗腐蚀性强、抗电磁干扰强、可实现分布式传感、可实时持续采集数据、灵敏度高、精度高、寿命长；其可以很好地应用于边坡工程中,且具有很好的发展前途和广泛的应用前景。
[Abstract]:With the continuous innovation of engineering testing technology and the requirements of the new situation, fiber Bragg grating testing technology has been well applied in the superstructure of civil engineering. It makes the mechanical testing of many complex structures convenient and feasible. In the slope engineering, because of some objective factors, the fiber Bragg grating testing technology has not been very good. In recent years, more and more engineering experts and scholars have been exploring its application in slope engineering to realize its popularization in slope engineering application.1. in slope engineering. The common physical quantities related to stress and strain related to stress and strain include slope displacement, bolt pulling force, bending moment of anti slide pile body and so on. This paper derives the related fiber Bragg grating testing and sensing. The theory of the device and the method of temperature compensation are used to analyze the relative error, and point out the precautions of the installation and its application..2. relies on the laboratory model test of continuous strong rainfall in high steep slope. The fiber Bragg grating test technology is applied to the centrifuge test of the slope engineering for the first time, and the fiber Bragg grating with equal strength is developed. Displacement sensor, fiber gratings anchor test element, fiber Bragg grating anti slide pile body bending moment test element. The fiber Bragg grating test system is introduced in detail and the test process and test method are described. Through the analysis of the test results, the data tested by the fiber grating test technology are in accordance with the actual law, which shows that the test technology is feasible By comparing with the traditional test method, we can see that the fiber Bragg grating testing technology has high precision, but also has its limitations. The application of fiber Bragg grating testing technology in the actual slope engineering is analyzed in detail with the combination of sensing technology and.3.. In the slope engineering of Yicheng railway, the protection and support structure are mainly passive. Protection net, active protective net, anchorage cable, retaining wall and anti slide pile are introduced in detail. The fiber grating testing system and the installation of related sensors on protection and support structure are introduced in detail. Through the analysis of the application results, the monitoring system runs steadily and dynamically monitors all kinds of physical quantities of the slope protection structure and support structure. It can effectively judge the status of rock fall in slope rock and the condition of slope soil, and can effectively send out early warning and alarm signals and ensure the safety of railway operation. The successful application of fiber grating testing technology in the project of yicwan railway slope provides a good reference for similar projects in the future. Comparing with the traditional test technology, we can see that the fiber grating testing technology is stable, strong and repeatable. Through the theoretical deduction and analysis of the full text and compared with the traditional test technology, it can be concluded that the fiber Bragg grating testing technology has small size effect, high reliability, strong corrosion resistance and strong anti electromagnetic interference. Cloth sensing can be used to collect data in real time, with high sensitivity, high precision and long life, and it can be used in slope engineering well and has a good future and wide application prospect.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU753

【引证文献】