Real-time earthquake detection system and method for railway tunnel lining damage

Abstract

The invention relates to a real-time earthquake detection system and method for railway tunnel lining damage. The method comprises the following steps: obtaining related data of an earthquake through a geophone; a cross-correlation method is adopted between two adjacent geophones to calculate seismic response between the two geophones; low-frequency sound wave interference is eliminated through high-pass filtering, the signal-to-noise ratio of a tail wave is increased, the signal serves as a reference signal, and the tail wave serves as a reference tail wave; a follow-up signal and a follow-up tail wave in the follow-up signal are generated every time a train passes; performing cross-correlation on the reference tail wave and the subsequent tail wave; and obtaining a tail wave interference value between each pair of adjacent geophones, and performing corresponding judgment. According to the real-time earthquake detection system and method for the railway tunnel lining damage, compared with an existing detection method, frequent tunnel detection is not needed once the device is laid, the workload is remarkably reduced, real-time detection is achieved, and the tunnel lining damage can be found in time.

Description

technical field [0001] The invention relates to the technical field of tunnel detection, in particular to a device and method for real-time seismic detection of a tunnel lining with a normal running train passing through a tunnel as a seismic source, so as to timely find the position where the tunnel lining may be damaged. Background technique [0002] Lining refers to a permanent support structure built with reinforced concrete and other materials along the periphery of the tunnel to prevent the deformation or collapse of surrounding rocks. Lining damage refers to cracking, deformation and spalling caused by water damage, freezing damage, and poor geology. etc., lining damage is the main form of tunnel disease, which destroys the stability of the tunnel structure and endangers traffic safety. Especially in recent years, with the rapid development of high-speed railway construction, tunnel lining damage has become a major hidden danger in traffic safety. This is because the ...

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Problems solved by technology

[0003] Existing tunnel lining detection technologies include: 1) Ground-penetrating radar technology, which can effectively detect cavities and accumulated water in the lining by using vehicle-mounted geological radar for scanning detection. The disadvantage is that the workload is relatively large, labor-intensive, and real-time monitoring cannot be realized; 2) Three-dimensional laser scanning technology can process the data obtained by multiple scans, and compare the deformation in any place before and after, which solves the problem that the naked eye is difficult to observe due to insufficient light; 3) Shock echo technology, in addition to the traditional In recent years, some vehicle-mounted percussion devices have been proposed. For example, patent document CN201610854251.5 proposes a vehicle-mounted percussion sound wave detection method, which can detect cavities in linings. Patent document CN109278772A also proposes a vehicle-mounted tunnel Wall percussion detection technology, which is less affected by moisture and steel bars, has advantages in detecting defects and voids; 4) Infrared detection technology, this method has a certain effect in detecting lining water leakage, but the current application 5) Fiber Bragg grating technology, this method can better detect the structural deformation and water leakage of the tunnel, and can carry out real-time monitoring and online transmission of the tunnel, especially for high-risk areas. Real-time transmission of monitoring data, the disadvantage is that it is difficult to install; 6) High-definition camera technology, using cameras to shoot images in the tunnel, and then using various data processing algorithms to analyze the collected images, so as to judge various diseases in the tunnel , the United States SHRP2 proposed a vehicle-mounted detection system that integrates ground-penetrating radar, infrared thermal imager and high-definition video image system to compare and verify each other. The main shortcoming of this system is that it cannot realize real-time monitoring; When there is no train passing by, the implementation of detection methods is mostly carried out point by point or section by section. It is not suitable for tunnels with relatively busy traffic, because the cost of temporarily closing the tunnel is expensive. Among the above methods, only the optical fiber deformation detection method It can realize real-time detection, but its disadvantage is that it is difficult to lay the sensor, and it is easily affected by temperature and vibration

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