資源描述:
《光纖bragg光柵傳感技術(shù)在隧道監(jiān)測(cè)中的應(yīng)用new》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
1、第26卷第3期巖石力學(xué)與工程學(xué)報(bào)Vol.26No.32007年3月ChineseJournalofRockMechanicsandEngineeringMarch,2007光纖Bragg光柵傳感技術(shù)在隧道監(jiān)測(cè)中的應(yīng)用12趙星光,邱海濤(1.北京科技大學(xué)土木與環(huán)境工程學(xué)院,北京100083;2.昆明理工大學(xué)國(guó)土資源工程學(xué)院,云南昆明650093)#摘要:在闡述光纖Bragg光柵(FBG)傳感技術(shù)的工作原理和優(yōu)點(diǎn)的基礎(chǔ)上,以昆明白泥井3隧道為實(shí)例,提出FBG傳感器在隧道內(nèi)的鋪設(shè)方案及溫度補(bǔ)償技術(shù)。經(jīng)過(guò)對(duì)隧道斷面的24h連續(xù)監(jiān)測(cè),討論隧道內(nèi)最大溫差對(duì)Bragg反射
2、中心波長(zhǎng)變化的影響,并對(duì)隧道每一監(jiān)測(cè)斷面上溫度傳感系統(tǒng)所取得的Bragg波長(zhǎng)值進(jìn)行可靠性的估計(jì),驗(yàn)證FBG監(jiān)測(cè)系統(tǒng)的可靠性。對(duì)隧道進(jìn)行8個(gè)月的定期監(jiān)測(cè),并對(duì)隧道斷面的應(yīng)變變化情況進(jìn)行分析,分析結(jié)果表明:干濕季節(jié)交替是導(dǎo)致測(cè)點(diǎn)應(yīng)變波動(dòng)的重要因素,而雨季是致使測(cè)點(diǎn)應(yīng)變變化增大的主要原因。目前隧道二次襯砌結(jié)構(gòu)穩(wěn)定;同時(shí),研究結(jié)果表明,F(xiàn)BG可準(zhǔn)確地測(cè)出隧道的應(yīng)變分布,將其應(yīng)用于隧道變形監(jiān)測(cè)中是可行和有效的。#關(guān)鍵詞:隧道工程;光纖Bragg光柵;白泥井3隧道;傳感技術(shù);監(jiān)測(cè)中圖分類號(hào):U45文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1000–6915(2007)03–0587–07
3、APPLICATIONOFFIBERBRAGGGRATINGSENSINGTECHNOLOGYTOTUNNELMONITORING12ZHAOXingguang,QIUHaitao(1.SchoolofCivilandEnvironmentalEngineering,UniversityofScienceandTechnologyBeijing,Beijing100083,China;2.FacultyofLandResourceEngineering,KunmingUniversityofScienceandTechnology,Kunming,Yunna
4、n650093,China)Abstract:OnthebasisofintroducingthebasicprincipleandadvantagesoffiberBragggrating(FBG)sensingtechnology,thelayoutschemesofFBGandtemperaturecompensationtechnologyintheBainijingTunnelNo.3inKunmingCityareputforward.After24-hourcontinuousmonitoring,theinfluenceofdaylongma
5、ximaldifferenceintemperatureonthechangesoftheBraggwavelengthisdiscussed;andreliabilityestimationoftheBraggwavelengthobtainedbytemperaturesensingsystemoneachmonitoringtunnelcross-sectioniscarriedout.ThecalculationresultsvalidatethereliabilityoftheFBGmeasurementsystemasaresultthatthe
6、standarderrorsoftheBraggwavelengtharelessthan14pm.Then,theeight-monthstrainmonitoringdatailluminatethatalternationofdryseasonandrainyseasonasanimportantfactoristhereasoninstrainfluctuationofmonitoringspotsandrainyseasonasthemainreasonfortheincreaseofstrainchange.Finally,animportant
7、monitoringpositionisdetermined;andthesecondaryliningofthetunnelisstableatpresent.TheachievedresultsshowthattheFBGisgoodatmeasuringstraindistributionoftunnelsduetoitsexcellentcharacteristicscomparedwithtraditionalelectromotivesensorsandotheropticalfibersensors.Asaresult,itisafeasibl
8、eandeffectivemethodforstru