Strain safety monitoring method for bearing body of cable tunnel

Abstract

The invention discloses a strain safety monitoring method for a bearing body of a cable tunnel. The method comprises the following steps: enabling a detection fiber to be in contact with a main bearing body of a tunnel or house closely; carrying out artificial simulation on the actual vibration of the detection fiber and establishing a data model; carrying out calculation on a feedback pulse by using a signal detection unit to obtain temperature, vibration and stress characteristic values, and carrying out mode identification on the real environment of the current detection fiber according tothe characteristic values; invoking a corresponding decision response for the identified mode; and carrying out remote alarming and displaying for different decision responses. According to the strainsafety monitoring method using the novel distributed optical fiber vibration sensing technology based on a coherent Rayleigh scattering principle, a fiber is used as a sensor. Typical vibration dataof train passing, rockfall, personnel damage, mechanical excavation and the like are collected and analyzed in real time under the working condition of an application site; characteristic parameters of dangerous events endangering the optical fiber tunnel are extracted; and an analysis model is established and a mode recognition algorithm is combined to efficiently monitor and early warn the dangerous events of the optical fiber tunnel in real time.

Description

technical field [0001] The invention relates to the technical field of tunnel safety monitoring, in particular to a strain safety monitoring method for a main bearing body of a cable tunnel. Background technique [0002] At present, with the continuous development of urban construction, people rely more and more on energy in their work and life, so various urban power supply facilities are also developing rapidly. Among them, the transmission cable is the main carrier of electric power transmission. With the development of society, a huge power supply network composed of transmission cables has been formed. Due to the wide distribution and high importance of cables, how to improve the real-time monitoring of cable body partial discharge, circulating current, and optical fiber temperature measurement to ensure the safety of cable operation is a problem that the power sector must face. Once the transmission cable fails, it will not only cause a large-scale power outage that a...

AI Technical Summary

Problems solved by technology

The cable tunnel has the advantage of strong sealing. Compared with the open-air transmission poles, it can prevent power transmission failures caused by natural disasters and accidents. However, the environment inside the tunnel is also relatively dangerous. Because there is oxygen in the tunnel, when the temperature of the cable is too high. When burning, it not only spreads quickly, but also easily produces a large amount of harmful gases; when dangerous gases such as methane and carbon monoxide reach a certain concentration, it will cause an explosion

At the same time, when a fire occurs, the internal environment of the power transmission tunnel is very bad, which will not only pose a personal safety threat to the emergency repair personnel, but also cause personal safety hazards because the communication of the emergency repair personnel is blocked.

[0004] At the same time, a large number of high-voltage cables, communication optical cables and other assets laid in the power tunnel have become the key theft targets of criminals. They are excavated manually or directly by machines. Once the weighing body of the tunnel is damaged, it will partially collapse. This phenomenon is not only caused by human beings, but also in natural disasters, earthquakes or continuous impacts from falling rocks will damage the load-bearing body. Once such phenomena occur, cables and optical cables will be short-circuited or stolen, and line failures will affect industrial production. , causing a great negative impact on the lives of residents

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