Aplicação de sondagem elétrica e GPR no mapeamento geotécnico no município de Belém-PA

Abstract

Shallow to medium depth subsurface geotechnical-lithological information is very important to project the foundation of civil engineering structures. Increasing demand of the residential and commercial buildings in Belém requires areas for expansion the urban region. Areas around the Macrodrenage project of Una Basin fulfill the conditions for this kind of requirement. Therefore, this area is chosen for the geophysical investigation to obtain geotechnical information of sub-soils. In the area studied is encountered a geotecnically rigid sand-sandstone bed underlying a soft organic clay zone. This bed is considered suitable for laying foundations by civil engineers. The depth to the top of this layer has been mapped using mainly geotechnical soundings, and Ground Penetrating Radar (GPR) profile. In the quantitative interpretation of geotechnical sounding known geotechnical-lithological information obtained through Standard Penetrating Tests (SPT) were taken into consideration. Finally, presented are the geotechnical-lithological sections, and 2D and 3D contour maps of the depth to the top of the rigid layer in studied area in order to help civil engineers project foundations.