Realization And Application Of The Finite Element Method For The Creep-damage Model Of Salt Rock

Since salt rock holds engineering features such as densification,low permeability,and other excellent mechanical performences,it is regarded as ideal place for energy reserves and disposal of radioactive waste.At present,the research on creep-damage characteristics of salt rock has achieved periodic results.However,these studies are simulated based on commercial and foreign finite element or difference element software.The program of numerical analysis with independent intellectual property rights is very rare.In this paper,we have compiled the independent program of the FEM for the creep-damage model of salt rock by FORTRAN language.This program can be used to calculate the problem of creep-damage at salt rock and the elastic-plastic or viscoelastic-viscoplastic problem of common materials.The main contents are as follows:?1?Study the basic theory and method of the elastic-plastic and viscoelastic-viscoplastic problem,and compile the related program.It provides the basic frame and algorithm for the design of program on the problem of creep-damage of salt rock.?2?Study the basic theory of creep-damage model of salt rock,and compile the program of the FEM about creep-damage model,and verify the correctness of the program with results of creep test of salt rock.?3?We establish the numerical model of the underground cavern,and study the characteristics of creep-damage by the self-developed program of FEM.The results show that,the damage zone first occurs at the bottom and top of the cavern.With the increase of time,the damage zone will develop to the central part of the cavern.The development of damage and deformation will be obviously suppressed when the cavern is subjected to internal pressure,it is beneficial to the stability of cavern.?4?Through the comparison of calculation results between FLAC^3D and the program of FEM with independent intellectual property rights,we know that the development law of cavern deformation and damage of these is approximately the same;it shows the validity and correctness of our program.