http://hdl.handle.net/10045/22815 2013-05-26T02:42:07Z 2013-05-26T02:42:07Z Herrera García, Gerardo Álvarez Fernández, Martina Inmaculada Tomás Jover, Roberto González Nicieza, Celestino López Sánchez, Juan Manuel Álvarez Vigil, Arturo Ernesto http://hdl.handle.net/10045/22915 2012-06-14T06:11:59Z 2012-04-18T00:00:00Z

Título: Forensic analysis of buildings affected by mining subsidence based on Differential Interferometry (Part III) Autor/es: Herrera García, Gerardo; Álvarez Fernández, Martina Inmaculada; Tomás Jover, Roberto; González Nicieza, Celestino; López Sánchez, Juan Manuel; Álvarez Vigil, Arturo Ernesto Resumen: This work presents a forensic analysis of buildings affected by mining subsidence, which is based on deformation data obtained by Differential Interferometry (DInSAR). The proposed test site is La Union village (Murcia, SE Spain) where subsidence was triggered in an industrial area due to the collapse of abandoned underground mining labours occurred in 1998. In the first part of this work the study area was introduced, describing the spatial and temporal evolution of ground subsidence, through the elaboration of a cracks map on the buildings located within the affected area. In the second part, the evolution of the most significant cracks found in the most damaged buildings was monitored using biaxial extensometric units and inclinometers. This article describes the work performed in the third part, where DInSAR processing of satellite radar data, available between 1998 and 2008, has permitted to determine the spatial and temporal evolution of the deformation of all the buildings of the study area in a period when no continuous in situ instrumental data is available. Additionally, the comparison of these results with the forensic data gathered in the 2005–2008 period, reveal that there is a coincidence between damaged buildings, buildings where extensometers register significant movements of cracks, and buildings deformation estimated from radar data. As a result, it has been demonstrated that the integration of DInSAR data into forensic analysis methodologies contributes to improve significantly the assessment of the damages of buildings affected by mining subsidence.

2012-04-18T00:00:00Z Tomás Jover, Roberto Márquez Moreno, Yolanda López Sánchez, Juan Manuel Delgado Marchal, José Blanco Sánchez, Pablo Mallorquí Franquet, Jordi J. Navarrete, D. Duque Biarge, Sergi http://hdl.handle.net/10045/21703 2012-04-04T06:18:33Z 2006-01-01T00:00:00Z

Título: Relationship between piezometric level and ground deformations measured by means of DInSAR in the Vega Media of the Segura River (Spain) Autor/es: Tomás Jover, Roberto; Márquez Moreno, Yolanda; López Sánchez, Juan Manuel; Delgado Marchal, José; Blanco Sánchez, Pablo; Mallorquí Franquet, Jordi J.; Navarrete, D.; Duque Biarge, Sergi Resumen: Differential SAR Interferometry (DInSAR) is a remote sensing method with the well demonstrated ability to monitor geological hazards like earthquakes, landslides and subsidence. Among all these hazards, subsidence involves the settlement of the ground surface affecting wide areas. Frequently, subsidence is induced by overexploitation of aquifers and constitutes a common problem that affects developed societies. The excessive pumping of underground water decreases the piezometric level in the subsoil and, as a consequence, increases the effective stresses with depth causing a consolidation of the soil column. This consolidation originates a settlement of ground surface that must be withstood by civil structures built on these areas. In this paper we make use of an advanced DInSAR approach - the Coherent Pixels Technique (CPT) [1] - to monitor subsidence induced by aquifer overexploitation in the Vega Media of the Segura River (SE Spain) from 1993 to the present. 28 ERS-1/2 scenes covering a time interval of about 10 years were used to study this phenomenon. The deformation map retrieved with CPT technique shows settlements of up to 80 mm at some points of the studied zone. These values agree with data obtained by means of borehole extensometers, but not with the distribution of damaged buildings, well points and basements, because the occurrence of damages also depends on the structural quality of the buildings and their foundations. The most interesting relationship observed is the one existing between piezometric changes, settlement evolution and local geology. Three main patterns of ground surface and piezometric level behaviour have been distinguished for the study zone during this period: 1) areas where deformation occurs while ground conditions remain altered (recent deformable sediments), 2) areas with no deformation (old and non-deformable materials), and 3) areas where ground deformation mimics piezometric level changes (expansive soils). The temporal relationship between deformation patterns and soil characteristics has been analysed in this work, showing a delay between them. Moreover, this technique has allowed the measurement of ground subsidence for a period (1993-1995) where no instrument information was available.

2006-01-01T00:00:00Z Tomás Jover, Roberto Márquez Moreno, Yolanda López Sánchez, Juan Manuel Delgado Marchal, José Blanco Sánchez, Pablo Mallorquí Franquet, Jordi J. Martínez Corbella, Mónica Herrera García, Gerardo Mulas de la Peña, Joaquín http://hdl.handle.net/10045/21695 2012-04-04T05:54:23Z 2006-01-01T00:00:00Z

Título: Monitorización de la subsidencia del terreno en la Vega Media del río Segura mediante Interferometría SAR diferencial (DInSAR) Autor/es: Tomás Jover, Roberto; Márquez Moreno, Yolanda; López Sánchez, Juan Manuel; Delgado Marchal, José; Blanco Sánchez, Pablo; Mallorquí Franquet, Jordi J.; Martínez Corbella, Mónica; Herrera García, Gerardo; Mulas de la Peña, Joaquín Resumen: Ground subsidence caused by aquifer exploitation is a geotechnical hazard that affects wide areas, causing important economic damages. This phenomenon is due to soil consolidation produced by the increase of effective stress caused by piezometric depletion. In this work a Remote Sensing Technique called Coherent Pixel (CPT) is applied to monitor subsidence in the Vega Media of the Segura River during a period of eleven years.

2006-01-01T00:00:00Z Tomás Jover, Roberto López Sánchez, Juan Manuel Delgado Marchal, José Mallorquí Franquet, Jordi J. Herrera García, Gerardo http://hdl.handle.net/10045/21688 2012-04-03T14:16:15Z 2008-01-01T00:00:00Z

Título: DInSAR monitoring of aquifer compaction due to water withdrawal: Vegas Baja and Media of the Segura river (SE, Spain) case study Autor/es: Tomás Jover, Roberto; López Sánchez, Juan Manuel; Delgado Marchal, José; Mallorquí Franquet, Jordi J.; Herrera García, Gerardo

2008-01-01T00:00:00Z