Stress And Deformation Analysis For CFRD And Effect Of Concrete Face Joints

Concrete face rockfill dam (CFRD) is developing rapidly in the construction of modernwater resources and hydropower projects because of its high security, low cost and wideadaptability. It is of great improtance for the dam design and engineering to conduct the stressand deformation analysis for CFRD and effect of concrete face joints. The main work and theconclusion done in this paper are as follows:1.In this paper, the development course, domestic and foreign research status of therockfill dam were introduced. The basic nonlinear theories and methods and several kinds ofconstitutive models for rockfill in the finite element simulation analysis of CFRD werestudied; Simultaneously, theory between the concrete face and the cushion and the theory ofthe thin panel unit theory in concrete face joints were elaborated.2. Using the ANSYS software, secondary development of the Duncan-Chang materialconstitutive model was realized to adapt the computational simulation of concrete facerockfill dam model. In software, using the element birth and death and load step, the concreteface rock-till dam’s construction process were simulated; The contact between cushion and theconcur face slab were simulated based on the surface-surface contact method. Take ShiTouxia reservoir concrete face rockfill dam as an example, this paper simulated the standardsection’s stress and deformation in the period of completion, the first stage and normal storagerespectively with a large number of chart. The results showed that the stress and deformationof the dam have met the safety stadard, meanwhile the result is consistent with similarprojects.3. Similarly, take Shitouxia face rockfill dam as an example, this paper simulatedhorizontal joints of the concrete face. Concrete’s stress and deflection were given with varioushorizontal joints numbers and width, and their distribution law was verified. The ideal partingjoint was explored to reduce the concrete’s stress and deflection using thin-layer element. Theresults showed: Basically, the arrangement of horizontal joints had no effect on the stress anddeformations of the dam; in the joints of different numbers, with the increasing of joints’number, maximum stress tended to decrease and the compressive stress had apparentlydecreased near the horizontal joints which appeared in several parts, but it had little effect onthe tensile stress; horizontal joints had little influence on the deflections of the concrete face;under the premise of the same number of horizontal joints,deceasing compressive stress was helpful to increase the joints’ width but this phenomenon was not obviouse, and it had noeffect on the deflections of the concrete face.