Study On The Stability Of The Right Abutment Of Pushihe Pumped Storage Power Station In Liaoning Province

At present, most of hydropower construction projects are large waterconservancy projects in our country. Engineering slope’s stability is the main problemin hydropower construction, and abutment slope’s stability is particularly important. Itis not only one of the key issues of the dam site selection but an important basis fordesign of slope support. Therefore, the stability study of the abutment slope willinfluence the safety of engineering.Pushihe Pumped Storage Power Station in Liaoning Province is the large waterconservancy projects in northeast of China which is under construction. It is to bearthe Northeast power system peak shaving and emergency standby. It plays animportant role in the security and stability of the Northeast power grid and alsoimportant to the economic operation. This paper relies on the project “The feasibilitystudy of Pushihe Pumped Storage Power Station in Liaoning Province”, and it has anin-depth and meticulous research on the stability of the right abutment slope.This paper was based on filed geological survey, and analyzed of the environmentand geological conditions of the right abutment slope. And it combined thecharacteristics of the rock and structure of the surface, conducted rock mass qualityclassification on the abutment slope of right bank. Then it used the method of strengthreduction by the finite element software ANSYS10.0, made a reasonable evaluation ofthe stability of abutment slope on the right bank on nature and excavation conditions.On this basis, it proposed the design scheme of support, and analyzed the stability ofthe supported slope. The specific research results are as follows:(1)Through the field geological survey, it showed the lithology of right abutmentslope is early Proterozoic mixed granite, and faults and joints developed. According tothe scale of structural surface, we conducted engineering geological classification, andit is divided into II, III, IV, V. And the III and IV structural surface mainly has impacton the stability of local slope.(2)Through the field of qualitative classification and the method of CSMR, the rock mass quality of the right abutment slope was classed II and III. It was mainlyclass II, and the proportion is71%. We can conclude that the overall stability of theabutment slope mostly in the steady state, which is consistent with field surveyanalysis.(3)Using the method of strength reduction by the finite element software ANSYS,we got the stress, strain and plastic strain of the slope with different strength reductionfactor on nature and excavation conditions, and then according to the computationsconvergence and the displacement of feature points, we got the safety factor of slopeunder natural and excavation conditions are respectively1.465and1.515.(4) Using the method of strength reduction, we evaluated the stability of shotcreteslope. The supporting safety factor is1.755. According to the simulation results, itsignificantly improved the stability of the rock mass, which prove that the supportingplan is feasible and reasonable.