Rock bolt modelling in rock cavern
Excavation in rock mass is a 3D process and the ensuing deformation cannot be directly simulated in a 2D finite element plane strain analysis. Hence, when this process is analysed in a 2D finite element plane strain analysis, different assumptions and approaches can be adopted. Some of the approache...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2017
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| Online Access: | http://hdl.handle.net/10356/72918 |
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| Summary: | Excavation in rock mass is a 3D process and the ensuing deformation cannot be directly simulated in a 2D finite element plane strain analysis. Hence, when this process is analysed in a 2D finite element plane strain analysis, different assumptions and approaches can be adopted. Some of the approaches include the convergence-confinement method and the stiffness reduction method. The stiffness reduction method is the approach used in Dimensional Discontinuous Deformation Analysis (DDA-2D) numerical software to simulate 3D excavation in a 2D scenario in this project. The method works by multiplying a reduction factor to the elasticity modulus of the material to be excavated to simulate tunnel advancement.
By gradual reduction of the elasticity modulus of the material to be excavated in each model, a number of models with different tunnel advancement scenarios can be created. In this project, three models representing different tunnel advancement scenarios with same geological condition would be used to study the displacement and stresses in the blocks and the forces in the rock bolts. Hence, the influence of rock bolt on the rock cavern under various installation times can be determined |
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