The Research Of Stability Of The Right Bank Slope Of The Long Yang Xia-la Xi Wa Section Of The Yellow River Gorge

The upper reaches of the Yellow River are rich in water resources.The complex geological environment in the Longyangxia-Rashiwa section,especially the erosion of the right bank,poses a threat to the existing hydropower projects.The deformation of the bury slope of the right bank of the Laxiwa Hydropower Station is beyond the normal range,which has caused widespread concern.Up to now,the displacement and deformation of the platform at the top of the Pudai slope have reached 40 m.Based on the monitoring results of the Northwest Research Institute of Survey and Design,this paper systematically analyzes the stability of the slope of the fruit sinks,and provides references for the future selection of hydropower stations and treatment of bank slopes,and provides references for other geologically complex slopes in the region.This paper provides reference for the future selection of hydropower stations and the management of the opposite side slope,so as to provide references for other geological and complicated slopes in this area.In this paper,we mainly study the historical development of slope research and the present situation at home and abroad by the method of literature analysis,and analyze the research methods of bank slope stability emphatically,and confirm the research method with qualitative,quantitative and numerical simulation.Secondly,through the theoretical research method,the regional geological conditions and slope structure,joint,structure and its influence analysis,determine the range of deformation area,get the obvious zoning of the slope deformation,point out the specific range of the numerical simulation of the bank slope.Combined with specific geological conditions,the correlation between the rockmechanics properties of water and bank slopes and the influence of superficial reformation on the stability of bank slopes were studied.This provided a reference value for the numerical simulation of rock mechanical parameters and pointed out The key research area of the bank slope simulation.At the same time,based on the regional denudation and the shallow surface reconstruction caused by the river valleys,the Midas GTS NX is used to carry out the river valley evolution and the unloading characteristics of the fruit Bank slope are basically the same,in which the stress in the slope has a good relationship with the measured stress.Finally,using UDEC to simulate the initial conditions of the bank slope and the deformation calculation and stability analysis of each stage after impoundment.Through the study of the bank slope,the following understanding and conclusion are drawn:(1)After each stage of water storage,the bank slope will appear varying degrees of deformation,the reservoir level changes in the slope deformation and stability has a significant impact.The comparison between the simulated observation data and the monitoring data shows that the two are roughly the same.(2)The deformation of the bank slope mainly concentrates on the top platform and the high elevation position,and the horizontal displacement is the leading edge of the top platform,and the vertical displacement is the main side of the top platform near the F1 fault zone.(3)The displacement rate of the bank slope in each stage of the change in the level of travel is the opposite sex.The change of water level will cause the increase of deformation rate.The maximum displacement rate of the bank slope is located in the leading edge of the top platform,the maximum is 60mm/d,but not over 90mm/d,the average rate of the top platform slope and its trailing edge is only about 30mm/d.(4)Although the slope of the bank is large,the probability of the overall unstability is small,but the phenomenon of fragmentation is likely to occur in the case that the stress-deformation of the bank slope is constantly adjusted under the condition of water level fluctuation.On the right bank of the Longyangxia-Lashiwa section of the upper reaches of the Yellow River,some bank slopes may be deformed due to geological reasons.Afterwards,when geotechnical construction is carried out in this section,adequate slope stability should be provided.Pay attention to choose the appropriate construction reinforcement program.