發(fā)布時(shí)間：2018-04-16 00:31

  本文選題：邊坡工程 + PPP-BOTDA分布式光纖技術(shù)　； 參考：《巖石力學(xué)與工程學(xué)報(bào)》2016年S1期

【摘要】：光纖傳感技術(shù)是滑坡監(jiān)測領(lǐng)域較新的方法,通過在白水河滑坡前緣采用定點(diǎn)固定加直接埋設(shè)的方式并行布設(shè)應(yīng)變式光纖和溫度補(bǔ)償式光纖,開展地表變形監(jiān)測。根據(jù)PPP-BOTDA分布式光纖理論,對(duì)應(yīng)變式光纖和溫度補(bǔ)償式光纖的應(yīng)變數(shù)據(jù)進(jìn)行溫度補(bǔ)償處理,得到光纖因變形而引起的實(shí)際應(yīng)變。利用巴特沃斯低通濾波去噪方法,比較4組不同采樣頻率下的濾波效果及殘差,確定濾波器階數(shù)n和截止頻率Wn。為表征2次監(jiān)測數(shù)據(jù)之間的差異,選取光纖2次監(jiān)測曲線與固定橫軸的面積差作為評(píng)判指標(biāo),獲取光纖沿線面積差,得到面積差與光纖應(yīng)變差異程度之間為正相關(guān)關(guān)系,同時(shí)與野外實(shí)測數(shù)據(jù)進(jìn)行對(duì)比分析。結(jié)果表明,采用PPP-BOTDA技術(shù)進(jìn)行滑坡地表變形監(jiān)測時(shí),利用巴特沃斯濾波器進(jìn)行去噪處理,并采用應(yīng)變面積差表征光纖應(yīng)變差異程度的分析結(jié)果,與野外空間地理位置上吻合度較高,對(duì)光纖技術(shù)在滑坡監(jiān)測中的應(yīng)用具有一定的借鑒意義。
[Abstract]:Optical fiber sensing technology is a new method in landslide monitoring field. Ground deformation monitoring is carried out by using fixed point and direct embedding in the leading edge of Baishui River landslide.According to PPP-BOTDA distributed fiber theory, the strain data of strain-type fiber and temperature-compensated fiber are processed by temperature compensation, and the actual strain caused by deformation of fiber is obtained.By using Butterworth low-pass filter de-noising method, the filtering effect and residual error of four groups of different sampling frequencies are compared, and the filter order n and cut-off frequency W _ n are determined.In order to characterize the difference between the two monitoring data, the area difference between the two optical fiber monitoring curves and the fixed transverse axis is selected as the evaluation index, and the area difference along the fiber line is obtained, and the positive correlation between the area difference and the fiber strain difference is obtained.At the same time, it is compared with the field measured data.The results show that the Butterworth filter is used to Denoise the landslide surface deformation monitoring with PPP-BOTDA technique, and the strain area difference is used to characterize the analysis result of the fiber strain difference degree.It is of great significance for the application of optical fiber technology in landslide monitoring.
【作者單位】： 中國地質(zhì)大學(xué)工程學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2011CB710600) 國家自然科學(xué)基金重點(diǎn)項(xiàng)目(41230637) 中央高�；�本科研業(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(CUGL150822)~~
【分類號(hào)】：P642.22

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