Indoor test device for advanced detection of subway shield tunneling based on electrical method

Abstract

The invention discloses an indoor test device for advanced detection of subway shield tunneling based on an electric method, which includes a model test shell, a main tunnel model, an abnormal body, a simulated tunnel surrounding rock, a detection device, an abnormal body replacement device, a data acquisition device and a controller The model test shell is a rectangular box without a cover, with a number of holes on one side of the box, the main tunnel model is fixed on the side of the model test shell with holes, and the detection device is installed on the main tunnel model to simulate the tunnel. The surrounding rock is filled in the model test casing, the abnormal body replacement device is fixed on the ring rib on the top of the model test casing, the abnormal body is placed on the abnormal body replacement device, and the controller and data acquisition device are fixed on the ring rib on the top of the model test casing , to communicate with the detection device and the abnormal body replacement device. The invention has the advantages of reasonable structure, low price and convenient implementation, and can measure abnormal body conditions in front of the working face on-line in real time.

Description

technical field [0001] The invention relates to the technical field of geophysical detection, in particular to an indoor test device for advanced detection of subway shield tunneling based on the electrical method. Background technique [0002] Electrical prospecting is less disturbed by the metal in the tunnel, and it is not easily disturbed by alternating electromagnetic fields during detection. It is sensitive to low-resistance anomalies and has high resolution. The production and construction of extremely harmful hydrogeological structures has unique advantages, and has achieved remarkable results in the actual advanced detection of subway shields. The physical simulation method of electrical prospecting is based on the similarity of physical phenomena, which can build a model closer to the complex geological situation, and at the same time can test and check the numerical forward modeling results at the laboratory scale, especially for complex geoelectrical For the sim...

AI Technical Summary

Problems solved by technology

At present, the measurement method adopted by the model device of the water tank method is the conventional fixed-point source three-pole method. A grounding electrode is fixed on the side wall far away from the tunnel face, and the measuring electrode moves along the survey line behind the tunnel face to collect data. This method is difficult to shield the influence of side interference near the survey line, and the leading directivity is poor, so it can only be judged qualitatively Is there any abnormal body within a certain range in front of the palm

It can be seen that there is no very effective indoor test model suitable for the advanced detection of subway shield tunneling.

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