The site of Bulunkou-Konggur hydropower station is located in an area with high altitude and ground stress area,as one of the biggest steeply inclined shaft having been built and being built.This inclined diversion shaft has many insecurity factors and difficulties during construction.The technology of excavating was that construction pilot shaft was first adopted and then followed by enlarging during the construction.Based on technical study,the construction method of inclined shaft enlarging with whole se...