Analysis Of Stability For The Right Spandrel Groove Slope Of Jinping I Hydropower Station

There are all have the high rock slope in railroad, traffic, water conservancy, and mine etc. basic engineering construction region. In order to make these infrastructure project well developing and fully displayed the engineering application function, it is the important meaning to make sure the high slope stability during the time of construction and operation.In this paper, the right spandrel groove high slope of Jinping I Hydropower Station in Sichuan province has been taken as an example. The combination methods of prototype investigation and indoor analysis, mechanism analysis and simulation studying have been used. The advanced theory and methods such as the Engineering Geology, Mathematical Statistics, and Numerical Simulation etc are included. On the basis of the investigation of the deformation damage phenomena disclosed in the excavation process, combined with the slope monitoring analysis and slope numerical simulation etc, the right spandrel groove slope stability has been analyzed. The acquired results are as follows:1. On the basis of the engineering geological condition investigation, combined with the slope excavation, the rock mass structure characteristics of the right spandrel groove slope have been fully studied. These include the structure plane engineering geological classification and the all levels structure plane engineering geological character and quality; Then, the rock mass structure model of the slope has been established.2. Based on the failure traces of slope, considering the characteristic of rock mass structure, the mechanism of deformation and the mode of deformation is analyzed,then the potential failure mode and its range of the right spandrel groove slope is confirmed3. Inferred from the monitoring data analyzed result, the slope deformation is mainly compatibility deformation in superficial department , caused by lower elevation slope excavation unloading. Along with the supporting measure implemented, the displacement of the slope is small, the largest displacement by monitoring is 11mm, and tends to be stable.4. Using the numerical simulation method, the FLCA3D model of the slope is established to simulate the process of excavation and analyze the stress and displacement characteristics of slope excavation and after the completion of slope excavation, concluded that: the overall stability of the right spandrel groove slope is stable and good to meet engineering requirements; the stability of overhung body in atomization zone slope is poor and its displacement does not converge.5. So far, the supporting measures which have already been operated take effect, the deformation of the slope is effectively controlled. The superficial rock masses of overhung body in atomization zone slope have collapsed, and immediate support should be carried out for the slope after collapse.