發(fā)布時(shí)間：2018-05-27 23:47

  本文選題：車載探地雷達(dá) + 地鐵隧道��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：地鐵隧道的運(yùn)營(yíng)安全至關(guān)重要。首先由于地鐵工程所處的環(huán)境特殊,地鐵運(yùn)營(yíng)后,地鐵隧道的病害具有隱蔽性強(qiáng)、診斷難、治理難的特點(diǎn),其次進(jìn)行地鐵隧道的檢測(cè)既不能破壞其原有結(jié)構(gòu),也不能影響到地鐵的正常運(yùn)營(yíng),因此地鐵工程結(jié)構(gòu)的無損檢測(cè)、健康診斷的方法就越來越受到工程技術(shù)人員的關(guān)注。車載探地雷達(dá)(GPR)技術(shù)是隧道結(jié)構(gòu)健康評(píng)估領(lǐng)域的一項(xiàng)快速無損檢測(cè)技術(shù),有著快速、無損、高效等優(yōu)點(diǎn),它改變了傳統(tǒng)手持GPR天線的測(cè)量方式,采用了空氣耦合式天線遠(yuǎn)距離檢測(cè)方式。本文把車載探地雷達(dá)系統(tǒng)應(yīng)用于地鐵隧道的健康檢查中,分析了地鐵隧道車載檢測(cè)條件及工作原理,通過地鐵隧道現(xiàn)場(chǎng)檢測(cè)試驗(yàn)和分析,主要得出以下結(jié)論:(1)采用中頻車載探地雷達(dá)300MHz空氣耦合天線在車輛限界之內(nèi)對(duì)礦山法施工的地鐵隧道進(jìn)行檢測(cè),可以探測(cè)到隧道襯砌表面的完整性、襯砌斷面的變化、襯砌表面的導(dǎo)水槽設(shè)施、襯砌厚度(初期支護(hù)和二次襯砌厚度)、地層類型(注漿加固地層),以及圍巖的擾動(dòng)或坍塌等病害;采用1200MHz高頻空氣耦合天線在車輛限界之內(nèi)對(duì)礦山法施工的地鐵隧道進(jìn)行檢測(cè),可在一定距離范圍內(nèi)探測(cè)到隧道襯砌厚度及表面狀態(tài)。試驗(yàn)驗(yàn)證了車載探地雷達(dá)系統(tǒng)在礦山法地鐵隧道檢測(cè)中的有效性和可行性。(2)采用中頻車載探地雷達(dá)300MHz空氣耦合天線在車輛限界之內(nèi)對(duì)盾構(gòu)法施工的地鐵隧道進(jìn)行檢測(cè),天線距離襯砌表面約80cm,可以探測(cè)到管片襯砌表面的完整性、管片層位以及管片背后注漿;當(dāng)采用1200MHz高頻空氣耦合天線在車輛限界之內(nèi)對(duì)盾構(gòu)法施工的地鐵隧道進(jìn)行檢測(cè),天線距離襯砌表面的距離約60cm,探測(cè)到的管片底界面效果顯著,雷達(dá)圖像清晰易分析。使用恰當(dāng)?shù)奶幚矸椒ǹ梢赃m當(dāng)減小管片內(nèi)鋼筋網(wǎng)對(duì)電磁波的影響。試驗(yàn)驗(yàn)證了車載探地雷達(dá)系統(tǒng)在盾構(gòu)法修建的地鐵隧道檢測(cè)中的有效性和可行性。(3)車載探地雷達(dá)檢測(cè)地鐵隧道時(shí),天線位于地鐵隧道車輛界限以內(nèi),在快速檢測(cè)的條件下可以探測(cè)到從襯砌表面算起2.0m深范圍內(nèi)的圍巖狀態(tài)。本文為地鐵隧道的檢測(cè)提供了一種新的檢測(cè)方法,車載探地雷達(dá)方法提高了地鐵隧道的檢測(cè)效率,可以改善檢測(cè)人員的勞動(dòng)強(qiáng)度和工作環(huán)境,同時(shí)也能保證檢測(cè)人員的人身安全,可為地鐵安全運(yùn)營(yíng)提供保障。
[Abstract]:The safety of subway tunnel operation is very important. First of all, due to the special environment of subway engineering, after subway operation, the disease of subway tunnel has the characteristics of strong concealment, difficult diagnosis and difficult treatment. Secondly, the detection of subway tunnel can neither destroy its original structure. It can not affect the normal operation of subway, so the method of nondestructive testing and health diagnosis of subway engineering structure has been paid more and more attention by engineers and technicians. Vehicle ground penetrating Radar (GPR) is a fast nondestructive testing technology in the field of tunnel structure health assessment. It has the advantages of fast, nondestructive and high efficiency. It has changed the traditional measurement method of hand-held GPR antenna. The air coupled antenna is used for long distance detection. This paper applies the on-board ground penetrating radar system to the health inspection of the subway tunnel, analyzes the condition and working principle of the subway tunnel on-board detection, and through the field test and analysis of the subway tunnel, The main conclusions are as follows: (1) the underground tunnel constructed by mine method can be detected by using 300MHz air-coupled antenna with medium frequency vehicle-borne ground penetrating radar (GPR), which can detect the integrity of tunnel lining surface and the change of lining section. The guided-tank facilities on the lining surface, lining thickness (initial support and secondary lining thickness), stratum type (grouting to reinforce the stratum, disturbance or collapse of surrounding rock, and so on); The subway tunnel constructed by mine method can be detected by 1200MHz high frequency air coupling antenna within the vehicle limit. The tunnel lining thickness and surface state can be detected within a certain distance. The effectiveness and feasibility of on-board ground penetrating radar system in the detection of underground tunnel of mine method is verified by the experiment. The 300MHz air coupled antenna of medium frequency on-board ground penetrating radar is used to detect the subway tunnel constructed by shield tunneling within the limit of the vehicle. The antenna is about 80 cm away from the lining surface, which can detect the integrity of the lining surface, the layer of the segment and the grouting behind the segment. When the shield tunnel is constructed by shield method, the 1200MHz high frequency air coupling antenna is used to detect the tunnel. The distance from the antenna to the lining surface is about 60 cm, the effect of the detected segment bottom interface is remarkable, and the radar image is clear and easy to analyze. The influence of steel mesh in segment on electromagnetic wave can be reduced by proper treatment method. The experiment verifies the validity and feasibility of the on-board ground penetrating radar system in the detection of subway tunnel built by shield method. The antenna is located within the vehicle boundary of the subway tunnel when the on-board ground penetrating radar detects the subway tunnel. The surrounding rock state can be detected within 2.0 m depth from the lining surface under the condition of rapid detection. This paper provides a new detection method for the subway tunnel detection. The on-board ground penetrating radar method improves the detection efficiency of the subway tunnel, and can improve the labor intensity and working environment of the detection personnel. At the same time, it can ensure the personal safety of the testing personnel, and provide security for the subway safety operation.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U456.3;U231.94

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