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Of transient electromagnetic new technologies in tunnel geological prediction

Author: WuJunJie
Tutor: LiZuo
School: Chang'an University
Course: Earth Exploration and Information Technology
Keywords: Tunnel Advanced geological prediction Transient Electromagnetic Method Unfavorable geological body Genetic Algorithms
CLC: U452.1
Type: Master's thesis
Year: 2005
Downloads: 566
Quote: 17
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Abstract


Tunnel boring, often encountered in water-filled fault, charging and mud water-filled cave, the fall of the water-filled column, broken belt, soft ground and other water bodies adverse geological body, these may cause adverse geological Mud Outburst, landslides and other emergencies , seriously affecting the speed of construction, and even cause major security incidents. Is particularly important to carry out geological prediction. At home and abroad using the method in geology and geophysical methods combined and supplemented by drilling ahead to achieve advanced geological prediction. Geophysical methods for advanced geological prediction, TSP law, geological radar Law, earthquake negative apparent velocity method, LANDSONAR, HSP acoustic wave reflection method, these methods have their own strengths in the application. In the construction, probing ahead of the face of the water body disease, is still a problem to be overcome in the the existing tunnel geological prediction method based on the introduction of a new tunnel geological prediction methods - instant variable electromagnetic Law. Transient electromagnetic method water-filled low-impedance faults, charge and mud water-filled cave, reflecting the sensitivity of the water-filled charge mud adverse geological fracture zone. In this paper, the study of transient electromagnetic method in the the tunnel detection of critical technology to solve key technical issues of the the tunnel background affect device transition process impact, the transient electromagnetic method for tunnel geological prediction. Data Interpretation Methods the equivalent conductive plane method suitable for the electrical model of the tunnel Mainland, and the m parameter extraction introduced in this part of the genetic algorithm is improved, thereby reducing the equivalent range of interpretation, to improve the accuracy of interpretation. This article is cited in the application of advanced geological prediction of transient electromagnetic method in different types of tunnel effect. Yichang-Wanzhou Railway the tunnel detection Baziling range fractured, filling muddy. Forecast results excavation results anastomosis proved the transient electromagnetic charge and mud cracks responsive. The Jinping Hydropower Engineering auxiliary a hole tunnel face detection range, and the side wall after excavation proved to be a lot of water, fissure water. The detection results consistent with the excavation results, indicating that the transient electromagnetic method for water-filled fissures responsive. Fengjie long Taipa Tunnel encountered the King charge and water charge and mud cave, the detection results are in good agreement with the actual situation. Therefore, the transient electromagnetic method is effective for the detection ahead of the face charge mud cave filled with water. The detection results can be seen, for a certain width of the water-filled, filled mud cracks, caves transient electromagnetic detection accuracy within 10%. Tunnel Mainland electrical model of the digital-to-analog and verified results show that the application of transient electromagnetic method tunnel geological prediction is effective, successful.

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CLC: > Transportation > Road transport > Tunnel project > Investigation, design and calculation > Survey
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