Stability Analysis of Spandrel Groove High Slopes of Zhongyu Hydropower Station
Under the influence of weathering,unloading and other factors,the stability of high and steep slopes is a key concern of hydropower projects.In order to evaluate the stability of the spandrel groove high slope of Zhongyu Hydropower Station and ensure the safety of the project construction,the stability of spandrel groove slope under natural,rainstorm and earthquake conditions is analyzed by block theory analysis and nu-merical simulation based on the engineering geological conditions of the dam site identified through field investigation.The results show that under natural conditions,the depth of the damage zone on the left bank is less than 10 m,the damage zone on the right bank is less,and the overall sta-bility is relatively stable.Under the condition of heavy rain,the depth of the failure zone is up to 20 m,and there is a small amount of tensile failure zone in the high-elevation unloading layer on the left bank,and there is a possibility of local instability in the high-elevation shallow sur-face of the left bank.Under the seismic condition,the depth of the failure zone is up to 30 m,and the stability of the slopes on both sides is poor.It is suggested that attention should be paid to small collapse and rockfall caused by excavation and blasting during construction,and active pro-tective measures should be taken.
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