Simulating Spatial Variabilities of Friction Angle and Cone Resistance by Using Distinct Element Method
Date Issued
2012
Date
2012
Author(s)
Chang, Yo-Wei
Abstract
In engineering analysis and design, the value of soil friction angles used were mainly obtained from triaxial test. However, considering the cost and time-consuming of triaxial tests, cone penetration tests have its advantage of cost and time-saving, and convenience. Hence, this research focuses on the relationships between spatial variability of friction angles acquired from triaxial tests and cone penetration tests. The clarification of this relationships helps to make it possible to seek the spatial variability of design friction angles through the spatial variability of cone resistance.
Variance and scale of fluctuation (SOF) are two important parameters to define spatial variability. Thus, it is crucial to understand the relationships, for example, the relationships between SOF of cone resistance and SOF of friction angle, in order to obtain one from another.
Since the deformation during cone penetration tests is relatively high, continuum analysis may not be a suitable method, a distinct element method PFC3D were taken throughout this research. Specimen with spatial variability were created and repeated to generate sufficient data.
The results show that, it is reasonable to assume that the cone resistance does not induce average effect of soil strength. Yet average effect would occur during triaxial tests for the contact area is larger with respect to cone penetration tests. The soil strength of a triaxial test is the average of 3 to 4 points on failure surface, rather than surface average or volume average
Subjects
spatial variabilities
cone resistance
friction angle
Type
thesis
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