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| Research and Practice of Geophysical Exploration for Railway in Cold Area |
| HAO Ming，XU Guang—chun，GUO Zhi—qiang |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 30025 1，China |
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Abstract Research purposes: It is difficult to do the Geophysical exploration for railway in cold area．The geophysical instruments often can，t be in normal status when the environmental temperature is under or close to the working temperature of the geophysical instruments．Simultaneity the shield effect of high resistance and hilgh velocity in the earth ‘s surface often impacts the collection and interpretation of the data．Through the selection of methods and research and tests of the performance of the instruments for the geophysical exploration in winter for Mudanjiang—Shuifenghe Railway and Jining—Tongliao Railway，the problems in the geophysical exploration for railway in cold area in winter were solved and the problems of engineering geology related to the tunnel and bridge were solved by using the technology of comprehensive geophysical exploration，which reduces the exploration cost and saves the construction time．
Research conclusions: (1)The shield effect of hilgh velocity in the frozen crust of earth surface may be eliminated by installing wave—detector and the hiigh—frequency filter．(2)To avoid the shield effect of high resistance in the earth’s surface。the electrodes need to penetrate the frozen crust with direct current electric method．(3)CSAMT is a preferable method for geophysical exploration for long tunnel，but due to the complexity of the electron components and batteries of its transmitting system and receiving system，the cold—resistance capacity of CSAMT is inferior to MT．(4)The installation of MT is in a simple way that the electron and magnetic probe connect with host computer directly．In this way，the system interferer Can be reduced and probability of appearance of problem like complicated circuitry can be lowered．Simultaneity the cold—resistant capacity of MT is stronger，and MTU一5 A can explore objects with high accuracy if the interferer is small．
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Received: 30 August 2010
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2010, Vol. 27 
