Study On Evolution Process Of Anti-dip Rock Mass Slope In The Left Bank Of Cihaxia Hydropower Station

In the construction of a large number of projects,we often encounter with the failure of anti-dip layered rock slope.The study shows that the mode of anti-dip layered rock slope deformation and failure is mainly for the deformation of toppling failure.Its development must go through a long-term geological evolution.This process has different deformation and failure characteristics in different evolution processes,and the characteristics of toppling failure are different in different time and space.There are three large toppling bodies and two loosen bodies in the left bank of Cihaxia dam site area in the upper reaches of the Yellow River.The dumping mechanism and the evolution process are still need further study.This paper based on the project that the complex deformation and failure mechanism of the layered rock slope and the study of governance measures.The structure of the slope is refined,and the dumping mechanism and evolution characteristics are analyzed from the difference of temporal and spatial distribution.The dumping degree of the study area is divided and analyzed by numerical simulation.The dumping evolution process of anti-dip layered slope is verified,and the results of this research are as follows.(1)According to the basic geological environment of the study area,it can be seen that the slope structure of the left bank slope in the Cihaxia dam site is mainly steeply inclined inward soft rocky rock slope(IV21),steeply inclined inward hard rock stratigraphic rock slope(IV22),orthorhombic reverse soft rock layered rock slope(III12),orthorhombic hard rock layered rock slope(V1),orthorhombic hard rock trap soft rock layered rock slope(V2).According to the differences of the slope structure,we divided the left bank bank from upstream to downstream into 4 large segments and 7 small segments.(2)Considering the factors of rock formation(the inclination of rock slopes,the maximum tensile tensor in the layer,the rock mass unloading deformation,the rock weathering characteristics and the rock velocity characteristics),the dumping level is divided into the strong dumping Area,the medium dumping area,the weak dumping area and the micro dump area.(3)The analysis of the evolution process of the slope of the left bank of the dumping body shows that the deformation and failure mode of the inclined body slope is bending-cracking,and its deformation and failure are long-term and progressive.The incision of the Yellow River to promote the initial deformation of the rock formation.With the Yellow River continue to cut and other factors,the slope rock to the deep and lower continue to develop.According to the deformation and failure characteristics of the dumping body,evolution process can be divided into the initial deformation stage,bending deformation stage and bending fracture through the stage.(4)The numerical simulation shows the evolution of the anti-dip layered slope.Based on the simulation analysis of the slope deformation and deformation at the present stage.The slope is in the process of bending and torsional deformation.The subsequent development of deformation and failure of slope rock mass is the formation of a potential through slip surface within the rock mass.