Abstract: Ground Penetrating Radar (GPR) has proven to be a promising nondestructive measurement methodology in transport infrastructure diagnostics as well as in many other fields. Thanks to the upgraded hardware and software technology, GPR is fast becoming a key instrument to obtain the properties of subsurface materials/layers with different relative permittivity by making use of the reflected electromagnetic energy. An important element in the use of GPR technology is the knowledge of the signal velocity of above-mentioned energy in the examined building materials, soil and rock layers. If this velocity is known, and time between sending and receiving the reflected signal is measured, the depth of the object or dielectric interface (as well as the thickness of the various layers of materials) can be estimated. Present study attempts to characterize and compare the available methods for acquiring the GPR signal velocity used in transport infrastructure evaluation

• Publication Date: 11-Oct-2015
• DOI: 10.15224/978-1-63248-065-1-40
• Views: 0
• Downloads: 0

Abstract: The objective of this research is investigating the piled foundation behavior under torsional load effect through a series of 3D numerical model. This paper presented a complicated three dimensional model to simulate the pile soil structure interaction problem. 2X2 pile group subjected to torsion was conducted in this study to draw a conclusion about the torsional resistance of pile group. Based on the Drucker-Prager behavior low the soil layer has been modelled. The concrete pile cap and cylindrical piles were modelled as elastic materials. The interface elements were attached between piles and surrounding soil to model the soil. The influences of pile length, group size and pile cap rigidity on the pile group resistance were presented.

• Publication Date: 11-Oct-2015
• DOI: 10.15224/978-1-63248-065-1-41
• Views: 0
• Downloads: 0