Evaluation of Surface and Subsurface Deformation Zone of Normal Fault within Bonded Overburden Soil by Distinct Element Method
Date Issued
2015
Date
2015
Author(s)
Lyu, Jhen-Yi
Abstract
The depth and character of the overlying earth deposit contribute to fault rupture path. For cohesive soil, for instance, clay, tension cracks on the ground happen during faulting, limiting the propagation of fracture in soil mass. The cracks propagate downwards while the fracture induced by initial displacement of faulting propagates upwards. The connection of cracks and fracture will form a plane that is related to tri-shear zone. With application of distinct element method the mechanism of fault propagation in soil mass and the development of ground deformation zone can be observed directly in numerical analysis of faulting. The information of force and deformation in the numerical model are also easier to be obtained than centrifuge modeling. Therefore, we take the results of centrifuge modeling as the field outcrop then modify the micro-parameter of numerical analysis to make sure both of them have the same attitude. A series of centrifuge tests and numerical modeling are conducted at this study with maximum acceleration conditions of 80g (equals to 16m thick of overburden soil) and dip angle of 60° on normal faulting. The model is with total overburden soil thick, H, 0.2m, vertical displacement of moving wall, ∆H. At the beginning, hanging wall and the left-boundary wall moves along the plane of fault. When ∆H/H equals to 25%, both of the walls stop moving. This study proved that the numerical analysis can be applied on simulation of centrifugal modeling and overburden soil deformation by normal faulting.
Subjects
normal fault
fault scarp
ground deformation zone
distinct element method
tension crack
Type
thesis
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