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Abstract Engineering geological investigation on mountainous hazards along Basu-Linzhi section of the south line of Sichuan-Tibet highway，is conducted，which indicates that rockfall hazard is extremely serious and should be treated as a special kind of hazard with great attentions. By analyzing influence factors of the hazard, an assessment approach is presented, with which 19 rockfall sites are assessed. Countermeasures are suggested according to relatively hazardous levels at a rockfall site.
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Received: 01 July 2002
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