Study On The Law Of The Sensitivity On An Arc Dam Body Design To The Base Deformation Modulus And Stability Augmentation Of Concrete Plug

It occupies an important position in the arch dam design that an arch dam foundation design. This paper introduces some of the problems in designing an arch dam foundation, and points out some mistaken ideas existing in choosing an arch dam foundation parameters and an arc dam foundation reinforcement. For choosing the value of the deformation elastic modulus reasonably during optimal designing an arch dam, the dissertation had optimized several arch dams with different height which supported by rock bases with various deformation modulus, and explores the types of an arch dam foundation rock deformation modulus on the shape design and the stress sensitivity, obtained some regularity understanding that during a dam height increasing, the arch dam optimization that the dam’s volume is the objective, the result is better with the foundation rock deformation modulus increase. The same high arch dams, in a different width-height ratio topography conditions, the most suitable rock deformation modulus changes little. It has no effect to the most suitable modulus of an arch dam foundation rock mass that the temperature data chances; At the same time, the author had analyzed the stress of an arch dam which hold by rock bases with different deformation modulus. The conclusions are as follows, the arch dam will not be more safety though small value of deformation modulus has been chosen when it was designed, and the value of an arch dam’s body stress should less than the tolerable value in case that the deformation modulus of the rock will change.For arch dam foundation reinforcement, this paper mainly discusses the role of the concret plug which acting on the reinforced abutment stability and control of arch dam abutment displacement. In reinforcing an arc dam abutment stability, a concrete plug axis direction and it’s section on abutment stability effection sensitivity have been analysed, puts forward the method of determining the concrete plug axis and it’s section on reinforcing an arch dam foundation; This paper has discussed the reinforcement effect to fault near the dam area of steep that the concret plug inhenced. In view of some error in the concrete plug design, the dissertation has analysed the concrete plug two elements-concrete plug axis direction and it’s section that how to effect the stability of the arc dam basement.For improving the design method of the concrete plug and seeking for the theoretical basis of the concrete plug designing, a design discipline was proposed in this paper that the displacement of the dam abutment should be equal to the compression of the concrete plug. The rock effects were simplified to the actions of resistance, and the formulas solving for the concrete plug’s section size were derive according to principle of minimum potential energy. The results showed that the mathematical relationship between the thrust and the displacement on the top of the concrete plug manifested as linearity, and the section area of the concrete plug is included in the gradient of the formula. Hereby, we can obtain the section of the concrete plug.Finally the dissertation verified the conclusions by a project built.