沉管接头突发渗漏水的红外监测模型试验

发布时间：2018-10-12 12:20

【摘要】：在沉管隧道的应用中,渗漏水已经成为威胁到沉管建设和运行过程中的重大问题。针对沉管隧道接头渗漏水的问题,通过建立等尺寸模型进行室内试验,模拟港珠澳大桥沉管隧道接头渗漏。采用红外技术建立无接触、无明水渗漏监测系统,收集沉管接头渗漏的红外辐射图像数据,并采用Matlab对图像数据进行分析。采用温度突变法,通过分析不同温度的水渗入接头OMEGA中导致构件红外辐射特征发生变化,从而对是否有渗漏水发生进行有效的判断,同时对影响判别的因素进行分析。试验结果表明:采用温度突变法的红外监测系统在沉管隧道中的监测,可以对突发渗漏水进行判别;当快速渗漏的水体与沉管接头处构件存在较大温差,则会造成构件表面温度突变;温差越大,造成的温度突变越明显,监测系统判定出渗漏所需时间越短。研究成果为红外监测在沉管隧道以及其他类似工程中的应用提供了一种思路,并验证了其可行性。
[Abstract]:In the application of immersed tunnel, leakage has become a major problem in the process of construction and operation. In order to solve the problem of leakage of immersed tunnel joint, the leakage of immersed tunnel joint of Hongkong-Zhuhai-Macao Bridge was simulated by establishing an equal size model for laboratory test. An infrared radiation monitoring system without contact and no open water was established by infrared technique. Infrared radiation image data of pipe joint leakage were collected, and the image data were analyzed by Matlab. By using the temperature catastrophe method, the infrared radiation characteristics of the components were analyzed in the OMEGA of the joints infiltrated by water at different temperatures, so that the occurrence of leakage water was effectively judged, and the factors affecting the discrimination were analyzed at the same time. The experimental results show that the sudden leakage can be distinguished by the infrared monitoring system using the temperature abrupt change method in the immersed tunnel, and when the temperature difference between the rapidly leaking water body and the component at the junction of the immersed pipe exists, The larger the temperature difference, the more obvious the temperature mutation is, and the shorter the time is for the monitoring system to determine the leakage. The research results provide a way of thinking for the application of infrared monitoring in immersed tunnel and other similar projects, and verify its feasibility.
【作者单位】：同济大学地下建筑工程系;
【分类号】：U459.5;U457.2

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