The left powerhouse No.1～5 sections and the right powerhouse No.24～26 sections of the Three Gorges Dam are located on the gentle slopes of both banks sides.The layout of the powerhouse behind the dam forms a steep slope with a tempora-ry slope height of 67.8m and a permanent slope height of 39 m.The deep anti-sliding stability of the bank slope dam section has always been one of the major engineering technical issues of the Three Gorges Project.On the basis of reviewing the geological conditions and previous research results of the bank slope powerhouse dam section,we analyzed the monitoring results of dam and foundation deformation,seepage pressure,etc.during operation,and elaborated the operational effects under various engineering measures.Based on the seepage monitoring data,the rigid body limit equilibrium method,parameter inversion,and nonlinear finite element method were used to recheck the deep anti-sliding stability of the dam sections.Research analysis showed that the moni-toring data of dam foundation deformation and seepage were within the designed allowable safety range.The inclined structural planes of the dam foundation rock mass were basically in a drained state.Based on the measured uplift pressure,the rigid limit e-quilibrium method and nonlinear finite element method were used for deep anti-sliding stability review,which indicated that the dam foundation was stable and safe.The project has been operating normally for 16 years since the trial water storage in 2008 to a water level of 175m.Combining the latest dam monitoring results to review and evaluate the deep anti-sliding stability of the dam is beneficial for providing reference for similar engineering constructions.
关键词
深层抗滑稳定/原型观测/刚体极限平衡法/三峡大坝
Key words
deep anti-sliding stability/prototype observation/rigid body limit equilibrium method/Three Gorges Dam
维普
万方数据