金沙江向家坝库区崩滑灾害的环境效应

ENVIRONMENTAL EFFECT ON GEOLOGICAL HAZARD OF LANDSLIDES AND ROCKFALLS IN XIANJIABA RESERVOIR AREA,JINSHA RIVER

金沙江向家坝库区长约１５０ｋｍ的沿江地带，共发育１０２个变形破坏体（含滑坡、崩塌和变形体），总体积１５．６５×１０８ｍ３．据统计岸坡变形破坏密度Ｄ和模数Ｅ分别达０．３４个／ｋｍ和５２４．９３×１０４ｍ３／ｋｍ．对崩滑灾害所处的环境特征研究表明，滑坡、崩塌与所在地层岩性、地质构造、地形条件、岩体结构特征及近期河流地质作用等环境因素共同作用有关．

Comprehensive investigation and systematic research on the deformation and failure of rock mass on the bank slopes in Xiangjiaba Reservoir area of Jinsha River have been conducted. It has been found that there are 102 landslides, rockfalls and deformed rock masses occurred on the 150km long valley slopes along Jinsha River from Xisngjisba upstream to Xiluodu. The total volume of them is about 15. 65 × 108m3. The average linear density of deformation and failure is 0. 34km(-1) and average linear modulus of deformation and failure is about 524. 93 ×104m3/km.Through investigation its evident that these landslides. rockfalls are correlated with their structural types of bank slopes,stratus rock property,geological structure,topographic change and recent geological function of river.