Artigo
Mapping surface deformation in open pit iron mines of Carajas Province (Amazon Region) using an integrated SAR analysis
Registro en:
Engineering Geology. Amsterdam: Elsevier Science Bv, v. 193, p. 61-78, 2015.
0013-7952
10.1016/j.enggeo.2015.04.015
WOS:000357350000005
WOS000357350000005.pdf
1647318644299561
0000-0002-0104-9960
Autor
Paradella, Waldir R.
Ferretti, Alessandro
Mura, Jose C.
Colombo, Davide
Gama, Fabio F.
Tamburini, Andrea
Santos, Athos R.
Novali, Fabrizio
Galo, Mauricio [UNESP]
Camargo, Paulo O. [UNESP]
Silva, Arnaldo Q.
Silva, Guilherme G.
Silva, Aristotelina
Gomes, Leonardo L.
Resumen
The Carajas mineral province encompasses the world's largest iron reserves with excavation carried out through open pit benching. Mining operations in the area have significant areas of rock mass movements and surface displacements that potentially lead to slope instabilities with risks to personnel, equipment and production. Instabilities can be expected due to deep excavations in rock masses of low geomechanical quality, blasting practices and heavy precipitation. In this paper, ground instabilities are monitored through an integrated SAR analysis based on a data-stack of 33 TerraSAR-X images. This approach was designed to monitor distinct displacement regimes, ranging from small to high deformation rates, and to map surface changes, based on variations of radar reflectivity. Results were compared with field information (total station/prisms, ground based radar, geological and geomechanical maps), and the approach showed to be effective for monitoring ground deformation in the region. Due to its capabilities (synoptic view, high accuracy, dense grid sampling), the complementary use of space-based SAR with field monitoring systems proved to be strategic for operational mining planning and risk assessment in this challenging environment. (C) 2015 The Authors. Published by Elsevier B.V. Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) National Institute for Space Research (INPE), São José dos Campos CEP 12227-010, Brazil Tele-Rilevamento Europa-T.R.E. Srl, 20143 Milano, Italy Federal University of Pará (IG/UFPA), Belém CEP 66075-110, Brazil Vale S. A. (DIFN/GEDEN/GAGHN), Serra dos Carajás CEP 68516-000, Brazil. São Paulo State University (FCT/UNESP), Presidente Prudente CEP 19060-900, Brazil FAPESP: 2010/51267-9 CNPq: 304254/2009-6