基于光纤感测技术的岩土工程感知杆件研发

发布时间：2018-01-08 10:21

本文关键词：基于光纤感测技术的岩土工程感知杆件研发　出处：《南京大学》2017年硕士论文　论文类型：学位论文

【摘要】：支护杆件作为岩土工程稳定性控制的主要手段,其自身的应力状态与结构变形直接影响到各类地质和岩土工程的安全,而分布式光纤感测技术,突破了传统的点式监测的局限,可对被测对象的整体应变性状进行连续分布式监测。因此,论文基于分布式光纤感测技术的特点,采用各种封装工艺,将三种岩土工程支护杆件研发成感知杆件,并在室内外试验的基础上,验证了它们的有效性。论文开展的工作和取得的成果如下:(1)从岩土工程支护杆件出发,指出了支护杆件监测的重要性,分析了现有监测手段存在的不足,介绍了光纤感测技术的优点,给出了论文的主要研究内容。(2)介绍了岩土工程监测中三种常用的分布式光纤感测技术,提出了岩土工程感知杆件的概念,并采用光纤感测技术,对锚杆、支护桩、测斜管三种杆件进行了感知杆件的结构设计。(3)详细介绍了感知锚杆、感知桩以及感知测斜管的制作工艺;开展了感知锚杆的室内拉拔试验和测斜管的弯曲试验,验证了其感知测试性能;山体滑坡和桩基静荷载现场试验进一步证明了感知杆件的可行性和有效性。(4)针对土工离心机模型试验的监测特点,研制了多种微型感知杆件,包括微型锚杆、微型测斜管、微型抗滑桩以及小型化的光纤光栅土压力盒和位移计;针对离心机高振动的特点,研发出了适用于振动测试的光纤光栅解调设备;通过土工离心机边坡模型试验,获取了不同离心力作用下,感知杆件与模型土体的变形规律,证明了土工离心机光纤监测系统的有效性。(5)结合无锡雪浪山边坡稳定性监测实例,设计了一套感知锚杆监测系统,详细介绍了光纤光栅感知锚杆的制作与安装工艺,研发出适用于野外无人值守的无线传输光纤光栅解调设备,并在现场设计搭建了太阳能供电系统。该监测系统实现了感知锚杆的实时监测,根据所获得数据分析了部分锚杆的轴力状态,对边坡稳定性做出了评估。
[Abstract]:The supporting rod as the main means of geotechnical engineering stability control, its should to all kinds of geological and geotechnical engineering safety and structural deformation directly affects the stress state, and the distributed optical fiber sensing technology, break through the traditional point monitoring limitations, of whole object should be shaped by degeneration continuous distributed monitoring. Therefore, the characteristics of distributed optical fiber sensing technology based on using a variety of packaging technology, three kinds of geotechnical engineering supporting rod developed into perception bar, and based on the laboratory test and verify their effectiveness. The research work and achievements are as follows: (1) from the perspective of geotechnical engineering supporting rod, a supporting rod pointed out the importance of monitoring, analysis of the shortcomings of the existing monitoring methods, introduces the advantages of optical fiber sensing technology, the main research contents of the paper are given. (2) introduces the geotechnical engineering In the process of monitoring three kinds of distributed optical fiber sensing technology, put forward the concept of geotechnical engineering perception of rods, and the use of optical fiber sensing technology, the anchor supporting pile, inclinometer tube three kinds of rod was designed sensing bar. (3) introduces perceived sense of bolt. Production process knowledge and perception of pile inclinometer; the bending test and anchor pullout test perception test tube and verify its performance perception test; static load test proved the feasibility and effectiveness of the sensing rod landslides and pile foundation. (4) monitoring according to the characteristics of geotechnical centrifuge model the test, developed a variety of micro sensing bars, including micro anchor, micro inclinometer, micro anti slide pile and the miniaturization of optical fiber grating pressure box and displacement meter; according to the characteristics of high vibration centrifuge is developed for vibration test of optical fiber Grating demodulation equipment; through the geotechnical centrifuge model test for different slope, centrifugal force, deformation of the sensing rod and the model of soil, proves the validity of the geotechnical centrifuge. The optical fiber monitoring system (5) with Wuxi Xuelang mountain slope stability monitoring example, designed a set of sensing monitoring system with bolt. The fabrication of fiber grating sensing bolt and installation process, the development of wireless transmission fiber grating demodulation equipment suitable for field unattended, and in the field of design to build solar power supply system. The monitoring system realizes the real-time monitoring of the perception of anchor, according to the data analysis of the axial force of bolt state, made evaluation of slope stability.

【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP274;TU195

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