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Application Study of the Method of Transient Electromagnetic in Tunnelling Geological Lead Prediction

Author: CaoYanFeng
Tutor: ZhangJun；ChangYuAn
School: Chang'an University
Course: Geological Engineering
Keywords: Tunnel construction Transient Electromagnetic Method Numerical Simulation Key technologies Applied Research
CLC: P631.325
Type: Master's thesis
Year: 2007
Downloads: 250
Quote: 2
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Abstract


With the construction of the grand blueprint of China's western development and building a moderately prosperous society in the formulation, highway, railway, water conservancy and other infrastructure projects will be further strengthened. China has a vast, complex topography lifeline engineering, to cross the mountains, so the tunnel project will become an important part of major construction projects. If complex areas of geological conditions encountered in the construction process may occur unforeseen rock burst gas outburst, groundwater sudden large deformation Bay as well as inside the cave and other geological disasters, serious threat to the safety of life and equipment of the tunnel construction workers, but also affect forward to the speed of the construction of the tunnel. Therefore, carried out in front of the tunnel construction tunnel face advance geological prediction, identify the front of the detailed engineering hydrogeological conditions for the forecast and prevention of geological disasters has important theoretical and practical significance. This paper analyzes the research predecessors in the tunnel geological prediction research based on the initial transient electromagnetic sounding techniques applied to the front of the tunnel construction tunnel face geological prediction. First, the paper briefly describes the basic principles of the transient electromagnetic; Secondly, the thesis of the transient electromagnetic equivalent wire planar imaging method and interpretation methods; Third, the papers for the common geological environment geophysical model, the establishment of a two-story model three-tier model, a simulation study of the different models; Fourth, the specific characteristics of the papers for the tunnel project, the key technologies and methods of work in tunnel construction in Front of Face geological prediction of transient electromagnetic method study; final thesis faults, fractured rock classification and underground river, hidden cave select three typical tunnel should research. Show that the detection of fault transient electromagnetic method, the accuracy of the fissures in the the Yiwan line Baziling Tunnel higher, up to 96.6%, an error of about 1m. In the the Qinling tunnel Ⅲ on, Western Han high-speed applications, the transient electromagnetic method can detect the Front of Face 25m within geological conditions, and can be used as one of the bases of the rock classification. Long Taipa sub-tunnel in the use of transient electromagnetic method to detect underground river, dark hole, accurate detection results with the actual situation in good agreement. Tunnel geological prediction application of transient electromagnetic method is feasible to forecast results in good agreement with the actual excavation results, the average accuracy rate of 88.3%, the minimum resolution of 1.2%.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Electrical prospecting > Method > Electromagnetic Method
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