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| Research on Application of High precise Gravity and Magnetic Measurement Technology in Geological Survey in Iron Mine Goaf |
| LIU Li—dong，LI Zhi—hua，Hao Ming |
| The third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China |
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Abstract Research purposes: The geological survey in iron mine goaf is a quite new subject for the geological survey for railway alignment. Based on the Seismic and electromagnetic methods，the hish—precise gravity and magnetic measurement technology wag successfully tried to conduct the geological survey in the iron mine goaf according to the characteristics of metallogeny and iron mine goaf．The discussion wa$made on the advantages and eomplementarities of different methods to seek the characteristics of the abnormal response in iron mine goaf and establish a set of working methods．
Research conclusions: The integrated geophysical exploration technologies of taking high—precise gravity and magnetic measurement as the principal technology WaS used for the geological survey in iron meine goal in She County along the Handan—Changzhi Railway， obtaining a rather perfect result．Through the comparison and verification of the data got by means of high—precise gravity and magnetic measurement，seismic reflection，TEM sounding and tightly point spacing DC sounding metheds，the abnormal area and boundary of the 90af were mapped out，which could provide very useful geological basis for the goaf evaluation and railway alignment．The experience from this project has a great directive significance to the geological survey for railway in the similar situation．
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Received: 31 August 2010
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2010, Vol. 27 
