Mohamedsayed
Civil/Environmental
- Apr 16, 2013
- 61
I am modelling an underground mine (depth =400 m). the model is three dimensional. the dimensions of the model are 250 *250 *250 m. a vertical load was applied on the top of the model to simulate the overburden rock, the bottom is fixed, and the edges are constrained in the X and Y directions.
the model is divided into layers, every layer represents a rock type. the element type is C3D8R. First to make my life easy, i assume elastic behavior and make the whole model one block without interfaces between the rock layers.
After deleting the elements to simulate the mine excavation, i checked the displacement. i found that the displacement is very small compared to reality. in other words, the model is so stiff. I realized that the main reason is a very high inertia since the whole model is one block, so i added interfaces between the rock layers and changed the element type to C3D20R. but the model still stiff, the rock layer should bent and deform more than what i see in the model results.
Is there any ideas about how to make the model behaves better than that (layers bent better).
Thanks.
the model is divided into layers, every layer represents a rock type. the element type is C3D8R. First to make my life easy, i assume elastic behavior and make the whole model one block without interfaces between the rock layers.
After deleting the elements to simulate the mine excavation, i checked the displacement. i found that the displacement is very small compared to reality. in other words, the model is so stiff. I realized that the main reason is a very high inertia since the whole model is one block, so i added interfaces between the rock layers and changed the element type to C3D20R. but the model still stiff, the rock layer should bent and deform more than what i see in the model results.
Is there any ideas about how to make the model behaves better than that (layers bent better).
Thanks.