基于分布式光纖測溫技術(shù)檢測灌注樁完整性試驗(yàn)研究
發(fā)布時(shí)間：2018-12-28 18:03
【摘要】：灌注樁直徑大、承載力高、施工成樁時(shí)無振動(dòng)擾土、施工現(xiàn)場噪音小、經(jīng)濟(jì)合理等優(yōu)點(diǎn),在城市地區(qū)、建筑物密集的場地被廣泛應(yīng)用。但樁基施工工藝要求較高,稍有不慎,就會(huì)出現(xiàn)各種質(zhì)量問題,所以采取有效的方法檢測灌注樁的質(zhì)量至關(guān)重要。然而現(xiàn)今的檢測方法存在設(shè)備笨重、費(fèi)用高、誤差大、無法快速、在線、長期監(jiān)測等問題。分布式光纖測溫技術(shù)應(yīng)用于灌注樁基檢測具有很大的優(yōu)勢,比如其體積小、質(zhì)量輕,靈敏度高,抗電磁干擾,能長期在線、實(shí)時(shí)快速分布式檢測樁基的質(zhì)量。本文介紹了光纖測溫技術(shù)檢測樁基完整性方法的原理和基本理論,并在已有的研究基礎(chǔ)上,對檢測系統(tǒng)的布線方式的設(shè)計(jì)進(jìn)行了探討和研究,制作了灌注樁模型,進(jìn)行了光纖影響范圍的試驗(yàn)研究,開展了灌注樁完整性現(xiàn)場試驗(yàn)及模型試驗(yàn)對比研究,主要研究結(jié)果下:(1)簡單介紹現(xiàn)在常用的樁基檢測方法及其存在的問題,對樁基檢測技術(shù)的基本研究現(xiàn)狀進(jìn)行總結(jié);介紹分布式光纖測溫技術(shù)的研究現(xiàn)狀以及該技術(shù)用于檢測樁基完整性的優(yōu)勢;介紹了基本的原理和方法。(2)檢測光纖布置方案優(yōu)化設(shè)計(jì)研究。分析課題組前期的模型試驗(yàn)和現(xiàn)場試驗(yàn)存在的不足之處;由一維徑向熱傳導(dǎo)理論,得出熱傳導(dǎo)臨界半徑主要影響因素及熱傳導(dǎo)的溫度分布特征;針對檢測系統(tǒng)的布線方式的設(shè)計(jì)進(jìn)行探討和研究,得出光纖采用“U”型回路布設(shè),加熱光纖熱傳導(dǎo)的臨界半徑等于樁身半徑的一半。當(dāng)布設(shè)多條光纖檢測時(shí),要分開間隔加熱檢測。(3)檢測光纖影響范圍的模型試驗(yàn)研究。根據(jù)一維內(nèi)熱源的徑向傳導(dǎo)理論,推導(dǎo)出光纖熱傳導(dǎo)臨界半徑的理論公式;試驗(yàn)證實(shí)了臨界半徑理論公式中加熱功率對臨界半徑起決定作用的結(jié)論,但光纖熱傳導(dǎo)臨界半徑的理論公式計(jì)算得到的結(jié)果與試驗(yàn)得出的臨界半徑結(jié)果相差較大,表明理論公式還有待進(jìn)一步的修正和完善,將在后續(xù)的研究中做進(jìn)一步的深化研究。(4)灌注樁完整性現(xiàn)場試驗(yàn)及模型試驗(yàn)對比研究。取某工程的鉆孔灌注樁,以加熱光纖方式來對灌注樁完整性進(jìn)行研究。試驗(yàn)表明無論何種加熱功率,現(xiàn)場試驗(yàn)的平均穩(wěn)定溫升值大于模型試驗(yàn)的平均穩(wěn)定溫升值;提出了關(guān)于定量分析夾泥缺陷灌注樁含泥量的思路。
[Abstract]:The cast-in-place pile has the advantages of large diameter, high bearing capacity, no vibration disturbance, low noise, reasonable economy and so on. It is widely used in urban areas where buildings are concentrated. However, the construction technology of pile foundation requires high quality problems, so it is very important to adopt effective method to detect the quality of cast-in-place pile. However, the current detection methods have some problems, such as heavy equipment, high cost, large error, can not be quickly, online, long-term monitoring and so on. The application of distributed fiber temperature measurement technology in pile foundation detection has great advantages, such as small volume, light weight, high sensitivity, anti-electromagnetic interference, long-term on-line, real-time and fast distributed detection of pile foundation quality. This paper introduces the principle and basic theory of the fiber optic temperature measurement technique for detecting the integrity of pile foundation, and on the basis of the existing research, discusses and studies the design of the wiring mode of the inspection system, and makes the model of the cast-in-place pile. The field test and model test of the integrity of cast-in-place pile are carried out. The main results are as follows: (1) the commonly used testing methods of pile foundation and the existing problems are briefly introduced. The basic research status of pile foundation detection technology is summarized. This paper introduces the research status of distributed optical fiber temperature measurement technology and its advantages in detecting pile foundation integrity, and introduces the basic principles and methods. (2) Research on optimal design of optical fiber layout detection scheme. Based on the one-dimensional radial heat conduction theory, the main factors affecting the critical radius of heat conduction and the temperature distribution characteristics of heat conduction are obtained. This paper discusses and studies the design of the wiring mode of the inspection system, and concludes that the critical radius of the heating fiber heat conduction is equal to half of the radius of the pile body when the optical fiber is arranged in "U" type loop and the critical radius of the heating fiber is equal to that of the pile body. When a number of optical fibers are deployed, the detection should be heated separately. (3) the model test of the influence range of the optical fiber is studied. According to the radial conduction theory of one dimensional internal heat source, the theoretical formula of critical radius of optical fiber heat conduction is derived. The conclusion that heating power plays a decisive role in the theoretical formula of critical radius is confirmed by experiments. However, the calculation results of critical radius of optical fiber heat conduction are quite different from the results of critical radius obtained by experiment. It shows that the theoretical formula still needs to be further revised and perfected, and further research will be done in the follow-up study. (4) the field test of the integrity of the cast-in-place pile and the comparative study of the model test. The integrity of cast-in-place pile is studied by heating optical fiber. The experimental results show that the average stable temperature rise of field test is higher than that of model test regardless of heating power, and the idea of quantitative analysis of mud content of mud-filled pile with defect is put forward.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1
本文編號：2394254
[Abstract]:The cast-in-place pile has the advantages of large diameter, high bearing capacity, no vibration disturbance, low noise, reasonable economy and so on. It is widely used in urban areas where buildings are concentrated. However, the construction technology of pile foundation requires high quality problems, so it is very important to adopt effective method to detect the quality of cast-in-place pile. However, the current detection methods have some problems, such as heavy equipment, high cost, large error, can not be quickly, online, long-term monitoring and so on. The application of distributed fiber temperature measurement technology in pile foundation detection has great advantages, such as small volume, light weight, high sensitivity, anti-electromagnetic interference, long-term on-line, real-time and fast distributed detection of pile foundation quality. This paper introduces the principle and basic theory of the fiber optic temperature measurement technique for detecting the integrity of pile foundation, and on the basis of the existing research, discusses and studies the design of the wiring mode of the inspection system, and makes the model of the cast-in-place pile. The field test and model test of the integrity of cast-in-place pile are carried out. The main results are as follows: (1) the commonly used testing methods of pile foundation and the existing problems are briefly introduced. The basic research status of pile foundation detection technology is summarized. This paper introduces the research status of distributed optical fiber temperature measurement technology and its advantages in detecting pile foundation integrity, and introduces the basic principles and methods. (2) Research on optimal design of optical fiber layout detection scheme. Based on the one-dimensional radial heat conduction theory, the main factors affecting the critical radius of heat conduction and the temperature distribution characteristics of heat conduction are obtained. This paper discusses and studies the design of the wiring mode of the inspection system, and concludes that the critical radius of the heating fiber heat conduction is equal to half of the radius of the pile body when the optical fiber is arranged in "U" type loop and the critical radius of the heating fiber is equal to that of the pile body. When a number of optical fibers are deployed, the detection should be heated separately. (3) the model test of the influence range of the optical fiber is studied. According to the radial conduction theory of one dimensional internal heat source, the theoretical formula of critical radius of optical fiber heat conduction is derived. The conclusion that heating power plays a decisive role in the theoretical formula of critical radius is confirmed by experiments. However, the calculation results of critical radius of optical fiber heat conduction are quite different from the results of critical radius obtained by experiment. It shows that the theoretical formula still needs to be further revised and perfected, and further research will be done in the follow-up study. (4) the field test of the integrity of the cast-in-place pile and the comparative study of the model test. The integrity of cast-in-place pile is studied by heating optical fiber. The experimental results show that the average stable temperature rise of field test is higher than that of model test regardless of heating power, and the idea of quantitative analysis of mud content of mud-filled pile with defect is put forward.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1
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1 饒?zhí)m;基于分布式光纖測溫技術(shù)檢測灌注樁完整性試驗(yàn)研究[D];湖北工業(yè)大學(xué);2017年
，本文編號：2394254
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