| Institute of Geomechanics, Chinese Academy of Geological Sciences | Host |
| Citation: |
Shaohua YANG, Zhonghai LI. A NUMERICAL CALCULATION APPROACH BASED ON FEM FOR LONG-TERM DEFORMATION OF LITHOSPHERE[J]. Journal of Geomechanics, 2018, 24(6): 768-775. doi: 10.12090/j.issn.1006-6616.2018.24.06.079
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A NUMERICAL CALCULATION APPROACH BASED ON FEM FOR LONG-TERM DEFORMATION OF LITHOSPHERE
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Abstract
Finite element method (FEM), which is very important in almost all fields of solid earth sciences, has been widely used in numerical experiments in solid earth sciences due to its flexibility and precision, ranging from short-term seismic activity to long-term lithospheric deformation, mantle convection and even planetary evolution. However, with the deepening of the research, some specific geological problems bring challenges to the finite element calculation, especially the numerical calculation of large-scale lithosphere deformation, such as the evolution of subduction zone and stress localization caused by plastic rheology in shear zone. Based on explicit FEM, an attempt is made to numerical calculation in the process of large deformation of lithosphere considering visco-elastic-plasticity in this study. Marker-In-Cell (MIC) approach was used in processing each material migration. On the basis of describing the basic principle and process, the core modules of visco-elastic deformation, elastic-plastic deformation, large deformation and heat transfer were tested. These four modules are the key to simulate the long-term deformation of the lithosphere. According to the comparison between the test results and the previous simulation results, the tested core modules basically meet the test requirements. It can be predicted that the existing basic algorithms can meet the needs of studying the large deformation of the lithosphere, and further specific research work will explore this kind of problem. -
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References
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Shaohua YANG, Zhonghai LI. A NUMERICAL CALCULATION APPROACH BASED ON FEM FOR LONG-TERM DEFORMATION OF LITHOSPHERE[J]. Journal of Geomechanics, 2018, 24(6): 768-775. doi: 10.12090/j.issn.1006-6616.2018.24.06.079
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- Figure 1. Triangle' s area-coordinates in cartesian coordinates
- Figure 2. Stress accumulation of a Maxwell body: boundary conditions and the comparison between numerical solutions (line) and analytical solutions (circle)
- Figure 3. Stress accumulation of elastic-plastic body: boundary conditions and the comparison between numerical solutions (line) and analytical solutions (circle)
- Figure 4. Rayleigh-Taylor instability verifications
- Figure 5. 1-D temperature profile comparisons between numerical solutions and analytical solutions of the lithosphere