Abstract：Research purposes:The additional second － line of the Baoji － Zhongwei Railway has to pass the Liupanshan Mountain area with the special stratum structure and the complicated and unfavorable geological conditions of development of fault structure and lots of landslides and debris flows． This paper studies the special stratum and the geological structure in the unfavorable geological condition area where the railway will pass in plan and proposes the alignment recommendations for the reference．
Research conclusions:The mountain summit area is generally featured with the complicated stratum，the development of unfavorable geology and concentration of the regional geological structure． The railway alignment in this area is limited by the geological condition． Before determination of the alignment，the reconnaissance survey should be done in large range for the area where the railway probably passes in order to know the distribution and development situations of the stratum，the unfavorable geological conditions and regional geological structure，and the comparison should be made for optional plans in technology and economics． By doing these works，the railway can keep away from the special stratum，unfavorable geological area and big fault zone to improve the engineering geological condition and technical condition of the large tunnel in mountain summit area．
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2012, Vol. 29 
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