Study on Application of Electromagnetic Tomography Advanced Geological Prediction in Tunnel Construction

With the large-scale construction and rapid development of underground engineering, a large number of underground engineering construction, such as tunnel and subway emerged. The geological structure of the tunnel is complex and the roc is fragmented. The electromagnetic tomography is a new geophysical technique in the tunnel. This method has advantages such as high resolution, high reliability and obvious image characteristics. Therefore, to insure the safety of the construction and to eliminate geological disasters, the advanced prediction technology of electromagnetic wave in tunnel detection is applied. In the paper, the electromagnetic tomography was used to detect the Huangzhuang tunnel geological condition. Electromagnetic wave can effectively and safely guide the excavation of the tunnel section working surface in combination with reconstructed images and excavation technology. The tunnel is narrow and long, the complete projection method cannot be used, so the coefficient matrix formed by the electromagnetic tomography. Exploration technology is highly sparse, and the maximum coverage of the limited angle is only 30°. So it is very difficult to get the complete reconstruction in anomaly areas under these conditions with present studies. Through numerical value analysis, its horizontal projection matrix has high reliability and guidance, at the same time, it can be safe in the tunnel.