| Based on site seletion of Qujiang bridge in yu-meng railway under complex seisms geological conditions, the methods of situ geological survey, seismic risk analysis, technical economy analysis are used. The regional engineering geological condition and seisms geological enivernment of Qujiang bridge are studied, which is the basis of site seletion of Qujiang bridge. The main research results are as follows.(1)These problems are studied in detail, which are the near-field regions geological environment, the new tectonic movements and earthquakes, active fault, earthquake risk of geological disasters, and other internal and external dynamic role of the regional geological features and geological engineering problems; the better bridge site is selected by the geological technich; a set of operational technique of railway line selection is summaried in complex gcological conditions.(2) The regional seismic engineering geological characteristics of the Qujiang Canyon regional are detailed summaried from seismic geological structure, the near-field zone of seismic geological environment; the basic reference is provided for the site selection of Qujiang Bridge(3) The seismic risk and seismic geological disasters conditions of the 5th bridge site are evaluated by seismic activity analysis, seismic risk analysis and other technical means.(4) The method of shear wave velocity test and the ground soil seismic response analysis are adopted to determine the Qujiang bridge seismic design parameters and seismic countermeasures.
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