地铁隧道车载GPR检测技术的试验研究

发布时间：2018-05-27 23:47

本文选题：车载探地雷达 + 地铁隧道　；参考：《西南交通大学》2017年硕士论文

【摘要】：地铁隧道的运营安全至关重要。首先由于地铁工程所处的环境特殊,地铁运营后,地铁隧道的病害具有隐蔽性强、诊断难、治理难的特点,其次进行地铁隧道的检测既不能破坏其原有结构,也不能影响到地铁的正常运营,因此地铁工程结构的无损检测、健康诊断的方法就越来越受到工程技术人员的关注。车载探地雷达(GPR)技术是隧道结构健康评估领域的一项快速无损检测技术,有着快速、无损、高效等优点,它改变了传统手持GPR天线的测量方式,采用了空气耦合式天线远距离检测方式。本文把车载探地雷达系统应用于地铁隧道的健康检查中,分析了地铁隧道车载检测条件及工作原理,通过地铁隧道现场检测试验和分析,主要得出以下结论:(1)采用中频车载探地雷达300MHz空气耦合天线在车辆限界之内对矿山法施工的地铁隧道进行检测,可以探测到隧道衬砌表面的完整性、衬砌断面的变化、衬砌表面的导水槽设施、衬砌厚度(初期支护和二次衬砌厚度)、地层类型(注浆加固地层),以及围岩的扰动或坍塌等病害;采用1200MHz高频空气耦合天线在车辆限界之内对矿山法施工的地铁隧道进行检测,可在一定距离范围内探测到隧道衬砌厚度及表面状态。试验验证了车载探地雷达系统在矿山法地铁隧道检测中的有效性和可行性。(2)采用中频车载探地雷达300MHz空气耦合天线在车辆限界之内对盾构法施工的地铁隧道进行检测,天线距离衬砌表面约80cm,可以探测到管片衬砌表面的完整性、管片层位以及管片背后注浆;当采用1200MHz高频空气耦合天线在车辆限界之内对盾构法施工的地铁隧道进行检测,天线距离衬砌表面的距离约60cm,探测到的管片底界面效果显著,雷达图像清晰易分析。使用恰当的处理方法可以适当减小管片内钢筋网对电磁波的影响。试验验证了车载探地雷达系统在盾构法修建的地铁隧道检测中的有效性和可行性。(3)车载探地雷达检测地铁隧道时,天线位于地铁隧道车辆界限以内,在快速检测的条件下可以探测到从衬砌表面算起2.0m深范围内的围岩状态。本文为地铁隧道的检测提供了一种新的检测方法,车载探地雷达方法提高了地铁隧道的检测效率,可以改善检测人员的劳动强度和工作环境,同时也能保证检测人员的人身安全,可为地铁安全运营提供保障。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3;U231.94

【参考文献】