| The Jinpingâ… Hydropower Station's project scale is huge.It is one of the YaLong River's hydropower plan main item reservoir staves. In these areas, the slope is steep and is accompanied with drastic epigene-action. The problem with high slope stability there is significant. The 5# mountain ridge"rock wall"slope is an important part of the whole project and it is vital to the safety of project.In this dissertation, the environmental conditions in the dam area and on-site geological investigations on the basis of summing up V# ridge "rock wall" structural features of rock slope, based on the phenomenon of deformation and damage at the scene, deformation monitoring data, FLAC3D simulation analysis, summing up the slope deformation and failure model and formation mechanism. Finally, calculation of strength reduction and the calculation of two-dimensional limit equilibrium analysis, and to evaluate the slope stability are embraced. Content and results of specific studies are as follows:(1)Analysis of geological conditions in the project on the basis of the excavation slope track, a more comprehensive study of the V# ridge "rock wall" characteristic of the slope of the rock mass structure, including the study area and the combination of the characteristics of lithology, structure engineering geological characteristics of surface characteristics and composition, and then carried out on the slope rock mass structure and rock mass quality zoning classification, the establishment of a structural model of rock mass slope.(2)Department of shallow slope deformation and f??re analysis of the phenomenon of the field investigation that the natural slope deformation and failure modes of the main differences between unloading rebound - creep, pressure-induced fracturing, shear slip, partial collapse . Excavated slope deformation and failure of the main block slip - after the rupture edge, plane (wedge) collapse mode. On the basis of processing a large number of cavities found lining cracks studies have shown that cracking of the main chamber lining is blasting excavation, slope deformation caused by unloading, the slope deformation is characterized by the level of deformation to reduce the depth decreases with the elevation . The same level by the lining of the depth of the cracks showed that the level of differences, mainly related to rock quality, and to stress the difference of space and shape of the excavation slope.(3)Have been through the deformation and stress analysis of monitoring data, FLAC3D numerical analysis of stress field on the slope, slope deformation, slope analysis of the characteristics of damage to areas that, after the completion of excavation, digging shallow slope form the department of cis direction of principal stress direction of excavation of surface deflection, the stress field of slope stability, such as slope excavation caused by stress - has been basically the end of deformation adjustment. Unloading by the impact of excavation, slope direction mainly to the overhead of unloading deformation, the more close to the slope, the greater the deformation. The study area most vulnerable to deformation and damage in the region should be more than 1770m elevation fault f5,f8 and its impact with the department of the superficial.(4) Calculated by the strength reduction of two potential slip surface?? two-dimensional limit equilibrium calculation, the comparison of the results, before excavation, the potential sliding surface isâ‘ combination of sliding surface, and after excavation potential sliding surface isâ‘¡combination of sliding surface, which is currently under excavation potential for fault slip surface f5 to 1700m + fresh rock + weak unloading rock mass + strong unloading of rock cut to 1625m elevation. Comprehensive analysis, the left bank of the V# ridge "rock wall" after excavation of slope stability factor of the higher, the most adverse conditions (rain + earthquake) as 1.4888, the slope at steady state.
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