本文關(guān)鍵詞：基于光纖感測技術(shù)的巖土工程感知桿件研發(fā)　出處：《南京大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 感知桿件 光纖感測技術(shù) 感知錨桿 感知樁 感知測斜管 土工離心機 邊坡 基坑

【摘要】：支護桿件作為巖土工程穩(wěn)定性控制的主要手段,其自身的應(yīng)力狀態(tài)與結(jié)構(gòu)變形直接影響到各類地質(zhì)和巖土工程的安全,而分布式光纖感測技術(shù),突破了傳統(tǒng)的點式監(jiān)測的局限,可對被測對象的整體應(yīng)變性狀進行連續(xù)分布式監(jiān)測。因此,論文基于分布式光纖感測技術(shù)的特點,采用各種封裝工藝,將三種巖土工程支護桿件研發(fā)成感知桿件,并在室內(nèi)外試驗的基礎(chǔ)上,驗證了它們的有效性。論文開展的工作和取得的成果如下:(1)從巖土工程支護桿件出發(fā),指出了支護桿件監(jiān)測的重要性,分析了現(xiàn)有監(jiān)測手段存在的不足,介紹了光纖感測技術(shù)的優(yōu)點,給出了論文的主要研究內(nèi)容。(2)介紹了巖土工程監(jiān)測中三種常用的分布式光纖感測技術(shù),提出了巖土工程感知桿件的概念,并采用光纖感測技術(shù),對錨桿、支護樁、測斜管三種桿件進行了感知桿件的結(jié)構(gòu)設(shè)計。(3)詳細介紹了感知錨桿、感知樁以及感知測斜管的制作工藝;開展了感知錨桿的室內(nèi)拉拔試驗和測斜管的彎曲試驗,驗證了其感知測試性能;山體滑坡和樁基靜荷載現(xiàn)場試驗進一步證明了感知桿件的可行性和有效性。(4)針對土工離心機模型試驗的監(jiān)測特點,研制了多種微型感知桿件,包括微型錨桿、微型測斜管、微型抗滑樁以及小型化的光纖光柵土壓力盒和位移計;針對離心機高振動的特點,研發(fā)出了適用于振動測試的光纖光柵解調(diào)設(shè)備;通過土工離心機邊坡模型試驗,獲取了不同離心力作用下,感知桿件與模型土體的變形規(guī)律,證明了土工離心機光纖監(jiān)測系統(tǒng)的有效性。(5)結(jié)合無錫雪浪山邊坡穩(wěn)定性監(jiān)測實例,設(shè)計了一套感知錨桿監(jiān)測系統(tǒng),詳細介紹了光纖光柵感知錨桿的制作與安裝工藝,研發(fā)出適用于野外無人值守的無線傳輸光纖光柵解調(diào)設(shè)備,并在現(xiàn)場設(shè)計搭建了太陽能供電系統(tǒng)。該監(jiān)測系統(tǒng)實現(xiàn)了感知錨桿的實時監(jiān)測,根據(jù)所獲得數(shù)據(jù)分析了部分錨桿的軸力狀態(tài),對邊坡穩(wěn)定性做出了評估。
[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.

【學位授予單位】：南京大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP274;TU195

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