Study on the slip deformation characteristics of concrete face rockfill dam with large dip angle dam foundation
The pumped storage power station(PSPS)is an important measure to achieve the strategic goal of"dual carbon".As one of the preferred dam types for the upper reservoir dam of PSPS,the concrete faced rockfill dam(CFRD)often has steep along-river slope of dam foundation and is prone to produce slip deformation along slope resulting in poor anti sliding stability of dam slope.It is dangerous for the op-eration safety of PSPS.Therefore,the numerical model of CFRD on large dip angle dam foundation is es-tablished.The law of slip deformation of CFRD on large dip angle dam foundation is studied.The mecha-nism of slip deformation of CFRD on large dip angle dam foundation is revealed.The physical mechanic and geometric structure design measures are proposed to reduce the slip deformation of CFRD on large dip angle dam foundation.The research results show that the larger sliding force and smaller anti-sliding force are the fundamental reasons why the CFRD on large dip angle dam foundation is prone to produce slip de-formation.The larger the dip angle of dam foundation,the greater the force of gravity along slope surface,the greater the slip deformation of dam body,and the smaller the safety factor of dam slope(when the dip angle of dam foundation is greater than 15°,the safety factor of dam slope is less than the minimum value(1.5)required by specifications).Adding pressure slope can effectively reduce the slip deformation of dam body and significantly improve the anti-sliding stability of dam slope.The higher the height and the wider the width of pressure slope platform,the greater the cohesion and internal friction angle of pressure slope,the smaller the slip deformation of dam body,and the greater the safety factor of dam slope.It is rec-ommended to take the height and width of pressure slope platform as 1/2 times the maximum dam height of main dam,and the density(cohesion and internal friction angle)of pressure slope is equivalent to that of main dam's rockfill.The research results can provide technical supports for the design and construction of CFRD for the upper reservoir of PSPS.
pumped storage power stationupper reservoir damconcrete face rockfill damlarge dip angle dam foundationslip deformation
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