Characteristics of Ground Deformation and Shallow Foundation Displacement of Overburden Cohesive Soil Induced by Strike-Slip Faulting
Date Issued
2016
Date
2016
Author(s)
Wong, Pei-Syuan
Abstract
According to investigation of recent earthquakes, ground deformation and surface ruptures were induced by faulting. The zones of horizontal and vertical surface ground deformation and different features of surface ruptures were investigated in the field. Because of the structural integrity, the surface rupture may detour the foundation. The overburden soil consists of softer material, which diffuses the strain of soil induced by faulting. The depth of soil and material properties are important factors of surface ground deformation, which influences the response of structure. This study presents results from shear box experiment on small-scale soft clay models subjected to strike-slip faulting (fault angle 90 ��) with shallow foundations (circular and rectangular shape ) placed on it in a 1-g environment. The quantifiable data including sequence of surface rupture, ground deformation and rotation and displacements of foundation are recorded with progressive strain. Based on the results of physical tests, numerical model of distinct element method is applied to analysis the influence of depths of soil and foundation to ground deformation and characteristics of foundation dislocation. The result of this study indicates the fracture system consists of R, P, Y shears. With increasing displacements of fault, R, P, Y shears appears sequently. Primary deformation zone (P.D.Z.) involves the surface ruptures, ground elevation and cracks. The thicker overburden soil layer causes wider P.D.Z. The shape and embedded depth of foundation have significant impacts on the width of P.D.Z. The rotation and movement along with the direction of fault of foundation increase. Due to deeper embedded depth, the rotation of foundation becomes smaller. To sum up, the macro behavior of the soil and foundation caused by faulting is surveyed, to validate the historic data and to take it considered geo-structure design.
Subjects
Active fault
Strike-slip fault
surface ground deformation
surface rupture
shallow foundation
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-105-R03521107-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):597f7bafe0ec9423e1fe9553e6aed6c2