Transient electromagnetic advanced detection fixed point gyration antenna for tunnel

Abstract

The invention discloses a transient electromagnetic advanced detection fixed point gyration antenna for a tunnel. The antenna includes an antenna unit and a gyration bracket, the antenna unit includes a transmitting antenna and a receiving antenna having the superposed axes and forming a coincident loop, the gyration bracket includes a vertically arranged support and a connecting rod matched with the support by rotating up and down relative to the support, the antenna unit is connected with the connecting rod by horizontally swinging relative to the connecting rod, when the antenna is used for detection, the transmitting antenna and the receiving antenna can synchronously detect the geological information ahead and surrounding the tunnel according to different angles, the acquired data can form a three-dimensional data volume to provide the basic data for further tunnel ahead overall three-dimensional imaging realization. By means of the advanced forecasting result of fixed point gyration antenna detection, the space position of the abnormal water-bearing body can be realized, advanced detection and water discharge boreholes can be distributed on purpose, so that the drilling cost is saved, the driving work efficiency is improved, and the tunnel driving accident is reduced.

Description

technical field [0001] The invention relates to the field of advanced detection of tunnels, in particular to a fixed-point-rotation-angle antenna for transient electromagnetic advanced detection of tunnels. Background technique [0002] my country is the country with the largest number of tunnels, the most complex situation and the fastest development in the world. The surrounding rock of the tunnel under construction is complex and changeable, and there are bad geology and water-bearing structures. Due to the limitations of geological survey data, survey design, and existing technical means, the geological reliability of the tunnel is limited, resulting in uncertainty in tunnel construction. Cause construction period, safety and economic risks. It is an urgent need to predict the water abundance and scale ahead with advanced detection technology. [0003] The transient electromagnetic method is a commonly used method in the advanced geological prediction of tunnels. It ad...

AI Technical Summary

Problems solved by technology

In the prior art, a patent for a tunnel transient electromagnetic advanced detection array antenna (CN103050769A) for physical simulation tests is disclosed, which mentions a detection method for an array antenna, but the face of the tunnel excavation The scope of the antenna is limited, and the antenna itself has a certain coil size and is significantly interfered by metal, as well as the inconvenience in the implementation of the array layout method. There is an urgent need for a convenient operation that can also improve the low resistance of the tunnel face. Method of volume detection effect

Moreover, the existing transient electric advanced detection technology mainly reflects the geological conditions directly in front of the tunnel excavation, and cannot feed back the information around the front of the excavation, which in turn causes water leakage accidents around the tunnel during construction, affecting construction safety.

Images