| Because of its economic,convenient construction,good security and other advantages,CFRD has attain great attention of dam industry.In recent years,CFRD has developed rapidly,becoming one of the most important dam types in our country.Lots of engineering experiences show that construction factors have become main factors in affecting stress and deformation of CFRD.Construction factors are also structural factors,mainly including rolling solidity,different temporary construction sections,rock-fill materials selection,zoning of rock-fills and so on.Therefore,construction optimization and deformation control of the dam have important effects on its safe operation.Base on shuibuya CFRD,finite element calculation is done using Marc software.Different construction layer thickness,temporary cross section forms,boundary positions,compression modulus of primary and secondary rock-fills and various horizontal joints numbers have been studied to analyze their influence to the dam’s stress and displacement settlement.Two -dimensional model calculations has been made using 1m、2m、3m、4m and 5m of construction layers.All the models use the same material parameters.The results show that dams’ deformation is smaller and stress is more reasonable,when construction layer is thinner;compared with the 5m filling layer,the settlement of the dam under 1m filling layer is 1.94 m,which reduced about 10cm;The four parameter K-G model is used to calculate the two-dimensional model of 250 m typical high CFRD.Analysis of simple full section construction and three kinds of complex construction methods in B 、 C 、 D types.Under simple full section construction,the stress and displacement distribution are the same with 100 m high dam,but differ in values.On designing the temporary section of high face rock-fill dam,the settlement of new and old construction layers ought to avoid secondary rock-fill zones.The paper used three-dimensional model of shuibuya CFRD to optimize the zoning of rock-fills.In the case of the same amount of main rock-fill materials,the stress and deformation of the dam can be improved by changing the dividing line of primary and secondary rocks,and adjusting the main and secondary rock-fill materials.Numerical results demonstrate that when boundary positions of primary and secondary rock-fills located at or above the dam axis,settlement of the dam can be controlled by replacing1/3-1/2 dam high range of secondary rock-fill materials.This paper introduces the basec architecture of OOFEM program in detail.The four parameter K-G model is added successfully to the original OOFEM program.The OOFEM program is able to analysis rockfills.At the same time,we adopt activityltf parameter to control the activation sequence of elements.Now the activation fuction of elements can be realized initially in OOFEM. |
