【摘要】：在道路拓寬工程中，新舊路基固結(jié)時間不同，沉降差異較大，新老道路結(jié)合部容易出現(xiàn)路面破壞，給行駛車輛造成不便和安全威脅，有高大邊坡支護(hù)的拓寬道路更加明顯。因此對新舊路基進(jìn)行監(jiān)測并得到其沉降規(guī)律十分必要。但是傳統(tǒng)的路基沉降監(jiān)測儀器多為點(diǎn)式監(jiān)測，不能對路基連續(xù)實(shí)時監(jiān)測，自動化水平低，工作量大。分布式光纖傳感技術(shù)不僅可以解決這些問題，還具有遠(yuǎn)距離、智能化監(jiān)測等特點(diǎn)。所以基于BOTDR技術(shù)對新舊路基沉降變形進(jìn)行監(jiān)測具有十分重要的意義。該文主要研究內(nèi)容及結(jié)論如下： 1.以光纖傳感技術(shù)為基礎(chǔ)，對兩種光纖進(jìn)行溫度、應(yīng)變標(biāo)定，得到兩種光纖的溫度、應(yīng)變傳感系數(shù)；通過對比分析兩種光纖的靈敏度，得到影響光纖靈敏度的因素。 2.介紹了BOTDR技術(shù)的原理，設(shè)計出一種基于BOTDR技術(shù)監(jiān)測路基沉降的方案。 3.室內(nèi)建立拓寬道路模型，按設(shè)計監(jiān)測方案埋設(shè)兩種光纖，并結(jié)合百分表驗(yàn)證了兩種光纖監(jiān)測土體、碎石沉降的可行性，檢驗(yàn)了光纖與土工布的同步變形能力。接著在模型上進(jìn)行堆載，，每隔一段時間讀取光纖與百分表的監(jiān)測數(shù)據(jù)，通過數(shù)據(jù)處理分析，得到新舊路基沉降變形規(guī)律。 4.以有限元分析方法為基礎(chǔ)，結(jié)合某拓寬道路的相關(guān)參數(shù)，運(yùn)用ABAQUS有限元軟件對典型工程斷面進(jìn)行分析，得到新舊路基沉降變形規(guī)律及主要影響因素。 5.將光纖實(shí)測新舊路基沉降變形規(guī)律與有限元計算結(jié)果對比分析表明：兩者基本一致。 6.根據(jù)有限元模擬結(jié)果，在青島市某道路拓寬工程中，選取一些易發(fā)生新老路基差異沉降的斷面，埋設(shè)傳感光纜和常規(guī)監(jiān)測儀器，驗(yàn)證了BOTDR技術(shù)監(jiān)測拓寬道路的工程可行性。
[Abstract]:In the road widening project, the consolidation time of the new and old subgrade is different, the settlement difference is big, the road surface destruction is easy to appear in the junction part of the new road and the old road, which causes inconvenience and safety threat to the driving vehicle, and the widening road with high slope support is more obvious. Therefore, it is necessary to monitor the new and old subgrade and obtain its settlement law. However, the traditional monitoring instruments for subgrade settlement are mostly point-based monitoring, which can not monitor subgrade continuously in real time, and the automation level is low, and the workload is large. Distributed optical fiber sensing technology can not only solve these problems, but also has the characteristics of long distance, intelligent monitoring and so on. So it is very important to monitor the settlement of new and old subgrade based on BOTDR technology. The main contents and conclusions are as follows: 1. Based on the optical fiber sensing technology, the temperature and strain sensing coefficients of the two kinds of optical fibers are obtained by calibrating the temperature and strain of the two kinds of optical fibers, and the factors influencing the sensitivity of the two kinds of optical fibers are obtained by comparing and analyzing the sensitivity of the two kinds of optical fibers. 2. This paper introduces the principle of BOTDR technology and designs a scheme of monitoring subgrade settlement based on BOTDR technology. 3. The indoor widening road model was built and two kinds of optical fibers were embedded according to the design and monitoring scheme. The feasibility of monitoring soil mass and gravel settlement with two kinds of optical fibers was verified by combining with the percentile, and the synchronous deformation ability of optical fiber and geotextile was tested. After that, the monitoring data of optical fiber and percentile are read every other time on the model, and the settlement and deformation law of new and old subgrade is obtained through data processing and analysis. 4. Based on the finite element analysis method and the related parameters of a widening road, the typical engineering section is analyzed by using ABAQUS finite element software, and the settlement and deformation law of the new and old subgrade and the main influencing factors are obtained. 5. Comparing and analyzing the settlement and deformation law of new and old roadbed measured by optical fiber and finite element analysis, it is shown that the two are basically the same. 6. According to the results of finite element simulation, in a road widening project in Qingdao, some sections which are prone to the differential settlement of new and old subgrade are selected, and the sensing cables and conventional monitoring instruments are embedded, which verifies the engineering feasibility of BOTDR technology to monitor the widening of road.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U416.1

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