| Until 2006,more than 87,000 reservoirs of various types have been built in China.The majority of the reservoirs were built in the nineteen fifties to the seventies.By the restriction of social factors and the development of technology,the construction quality of most reservoirs failed to live up to the design standard.The damage of dam was so serious that accidents occurred frequently.According to statistics,there are more than 37000 dilapidated reservoirs,of which more than 95% are earth dams.Many factors can lead to the damage of rock-fill dams,such as seepage,stability,cracks,etc.Currently the calculation of seepage and stability and other aspects,has become increasingly mature.But the research about the deformation of soil asymmetrical settlement often founded in the calculation of earth and rock-fill dams should be improved.Appropriate calculation method and the constitutive model is the key to influence the calculate result.As the finite element method has the characteristics of relatively accurate and efficient;Duncan-Chang E-B model can simulate most of the features,the article finally selected finite element method and Duncan-Chang E-B model.In this paper,by use of ANSYS software,using APDL programming language,second time development function and add the Duncan-Chang E-B model macro command,using the "birth and death element method" of layered filling simulation of earth and rock-fill dam construction,and the post-processing program is compiled to modify the displacement.Specific process is as follows:(1)the establishment of a 100 m homogeneous dam model to simulate the construction process,the output stress and strain contours of analysis the result accords with the general law of earth and rock-fill dam,has a certain accuracy.(2)combined with the case of earth and rock-fill dam related literature,simulated the process of layered load,and the result of the hierarchical load is analyzed,the results of the stress distribution accords with the general law of earth and rock-fill dam,can be used in engineering practice.This paper,taking an example of consolidation project of Jian Li reservoir,the dam construction process was established model of three-dimensional finite element simulation analysis of earth and rock-fill dam during construction with the method of hierarchical filling,using Duncan-Chang E-B model,carries on the simulation,the calculation assumes that earth and rock-fill dam during construction of the dam material deformation in the process of layered filling is complete,the dam filling,filter materials,dam foundation sandy pebble in homogeneous isotropic,Jian Li reservoir is established the corresponding relation between the earth and roc-fill dam deformation and load,to settlement and horizontal displacement in earth dam were analyzed,and the crack location,find out where is the weak link,and take corresponding measures.The calculation results for engineering and consolidate can provide important reference after the dam safety monitoring and management. |
