Foundation Rock Selection Of Gravity Dam Based On Dam Foundaiton Rock Mass Structure

Dam foundation rock selection of gravity dam is the greatest important to dam safety and building price. The current code demand to select dam foundation rock by the single factor—weathering zoning of rock mass, the selected standard of the code shows too simple in complicated geological conditions.Around the define and its inner meaning of the basic concept of dam foundation rock structure ,the basic types devision of dam foundation rock mass structure and the foundation rock selection of gravity dam according to dam foundation rock mass structure in complicated geological conditions are put forward based on the great deal of research of past generations, at the same time, the selection flow chart and the selection methods are given in the paper.As to the necessary work of selection gravity dam foundation rock—Analysis of dam foundation rock mass stability, the control effects of dam foundation rock mass structure to dam foundation stability and the sliding types and mechanism of dam foundation rock mass are introduced in the paper;the limiting equilibrium method and nonlinear finite element method are introduced ,and relating to characteristic of gravity dam depth sliding stability problem and its sliding mechanism,make the suitable estimate for instability criterion of nonlinear finite element analysing depth sliding stability problem.Take the selection dam foundation rock mass of JinAnQiao dam for instance, carry out the complete set of procedure and methods of the selection foundation rock of high concrete gravity dam based on dam foundaition rock mass structure to verify the probability.Finally, by contrasting to the demand of the code requirement, further proving the feasibility of selection foundation rock of gravity dam based on dam foundation rock mass structure.