A real-time advance detection method for vector resistivity of water-bearing hazard bodies

Abstract

The present application relates to a real-time advance detection method for vector resistivity of water-containing disaster bodies. The method includes: acquiring the potential difference of each receiving dipole on the shield machine in real time based on a pre-built detection environment, where each receiving dipole includes each first receiving dipole and each second receiving dipole; The relative position relationship of the dipoles and the potential difference of each receiving dipole, the resistivity conversion is carried out using the resistivity calculation formula of the steady flow field to obtain the apparent resistivity of each receiving dipole; the position of the power supply dipole is taken as the abscissa, and the apparent resistance The apparent resistivity curve of each receiving dipole is drawn as the ordinate, and the apparent resistivity curve of each receiving dipole is analyzed to determine the detection result of abnormal body, which realizes that during the continuous excavation of the underground shield machine, according to the difference between the receiving dipoles Stop the ground to receive electrical signals and draw the apparent resistivity curve of each group of receiving dipoles, so as to detect the water-bearing hazard in front of the excavation in real time, and improve the real-time performance of the advance forecast results.

Description

technical field [0001] The present application relates to the technical field of tunnel engineering, in particular to a real-time advanced detection method for vector resistivity of water-containing disaster bodies. Background technique [0002] At present, in order to solve the problem of urban traffic congestion, my country has begun to build subway traffic on a large scale. In the process of subway tunnel excavation, it is necessary to detect through the tunnel advanced detection technology, do a good job in the advanced prediction of bad geological bodies, and prevent the occurrence of disasters such as water inrush and mud gushing. [0003] Tunnel advanced detection technology includes advanced drilling method, geological radar method, DC resistivity method, infrared detection, electromagnetic method and seismic wave method. In view of the actual needs of tunnel advance detection, two or more technical means are often used for comprehensive detection. Each method has ...

AI Technical Summary

Problems solved by technology

The construction of the high-density method on the ground is relatively cumbersome and is easily shielded by the high-resistivity layer; the DC advanced detection in the mine is not very accurate in explaining the abnormality ahead, and it is easy to make false alarms; the construction of the transient electromagnetic method is convenient and fast, but there are certain blind spots. Highly susceptible to underground electromagnetic interference

For long-term forecasting, that is, more than 100m in front of the tunnel face, seismic wave method, such as TSP advanced forecasting, is required. This method requires drilling and blasting. The construction is complicated and time-consuming, which may have a certain impact on the geological structure of the tunnel.

[0004] Therefore, at this stage, each advanced geophysical detection technology has its own application conditions and applicable scenarios, and they are all "prediction before excavation", that is, prediction and construction are separated, which makes the real-time performance of advance prediction results low.

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