Analysis On Slope Stability Of Jinchuan Hydropower Station

Jinchuan Hydropower Station is located in Jinchuan county, Aba autonomous region of Zang and Qiang race in Sichuan Province. It is a main control project on the upper reaches of the Dadu River. The right bank of the station has a road from Jinchuan country to Maerkang, where is far away 425km from Chengdu, the external traffic is very convenient. It is the sixth hydropower station on the Dadu main stream for water and electricity planning. The main task of the project is to generate electricity with. Installed capacity of 860MW, is belonging to the first big (2)-type projects.Slope stability has been a very significant problem in construction of water conservancy and hydropower project. It not only directly determines the feasibility of project construction, but also affects project investment and safe operation. Dozens of water conservancy and hydropower projects had occurred problems in the slope instability in china, such as the high slope on Tianshengqiao secondary hydropower factory site, the high slope on the left bank abutment of Manwan Hydropower Station, and so on. It not only expends a great deal of money for slope management, but also delays project deadline, and some slope programmes have became key factors to time limit and success. Therefore, It is of great theoretical and practical significance to speed up the pace of scientific research on slope engineering of water resources and hydropower projects and to study slope stability and governance program.This paper emphasizes the important hole of insist research for geological prototype and geological processes analysis. Based on detailed investigation of the rock mass structure in dam area, through more meticulous research on engineering geological conditions, slope structure, types and causes of deformation and failures for the natural slope,and this paper analyses specially some basic problems, such as slope stability conditions, the quality of rock mass, rock mass mechanics parameters, the possible deformation and failure modes and boundary conditions on entrance slope of the power system s left bank . The author measures precisely all the structure surfaces in plane tunnels, and acquires as many characteristic parameters as possible for structure surfaces through three-dimensional laser scanning on the outcrops, digital video recording, measured precisiely frame and statistics of structure surface along the road . By quality grading for rock slope, analyzing rock-mass quality features by excavated slope in future; using three-dimensional model and disc model of structure surface, to acquire the location distribution of long and big structure surface from digged slope and evaluate slope stability on evidence bulks; obtained structure surface connectivity and the synthetical intensity parameters of structure surface by network simulation; according to the slope structure, weathering zone, rock band and the corresponding mechanical parameters, studing slope overall stability and slope ratio.Finally, combineding engineering geological conditions of the project slope and possible failure modes and the author raises measures to deal with, and expound and prove the reasonable gradient of artificial excavation slopes in the project area, providing reliable geological basis and support measures for engineering design.