Abstract：Research purposes: The purposes are to make a full and efficient use of ail kinds of prospecting means to find out the geologic conditions of the foundation for providing the real geological parameters to the design.
Research methods : The different prospecting means are adopted to find out the geological conditions of each experimental section according to the different geological conditions.
Research results: After analyzing and studying the same geological investigation data, relevant specifications, standards and study results at home and abroad, the various kinds of geological surveying methods are adopted to make geological survey, and the results of survey are real, accurate and reliable, which meet the design requirements and reach at the expected target.
Research conclusions: In order to satisfy the strict requirement of ballastless track for subsidence control, the accuracy of geological investigation must satisfy and surpass existing specifications to reach and meet engineering requirement.
2007, Vol. 24 
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