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Main Problems in Engineering Geology and Geological Alignment in Xiamude-Katmandu Section of China-Nepal Railway

YAO Zhi-yong;China Railway First Survey and Design Institute Group Co.,Ltd.;  
The proposed Xiamude-Katmandu section of China-Nepal Railway through the mountains of Himalaya is characterized by neotectonic movement and strong earthquake,strong tectonic stress field,heavy strong magmatic activity,intense water and heat activity,fierce shear of the gravity planation surface and serious physical weathering. The active internal and external geological forces lead to the extremely complicated environmental engineering geological conditions and the railway track is much affected by the geological disasters,such as slope stability,damage by debris flow,heat damage of high ground temperature,hard rock burst and large deformation of soft rock under high ground stress,large active faults effect. The results suggest that the Xiamude-Gyirong-Katmandu( AK) solution running in the Geelong Zangbo gorge area is encountered with relatively slow natural slope, favorite port station conditions and less earthquake impact,where the direction of the railway is nearly parallel to the direction of the principal stress. While,The Xiamude-Nyalam-Katmandu( A1K) solution running in the Yu Bo Mountain canyon area is met with relatively steep natural gradient,difficult station conditions,although the stratum is formed mainly with hard rock,the internal and external forces are active and the main geological problems tend to get more intense. In view of the slope stability,damage by debris flow,heat damage of high ground temperature,hard rock burst and large deformation of soft rock under high ground stress consideration,the AK solution is proved superior to the A1 K solution.
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