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Subsoil geophysical evaluation using GPR and free software
Evaluación geofísica del subsuelo usando GPR y software libre
Keywords:
weeping willow trees, reflection, georadar, GPR, electromagnetic methods, scour, drying effect, subsoil disturbance (en)georradar, métodos electromagnéticos, reflexión, socavación, efecto de desecación en estructuras, alteración del subsuelo, sauce llorón (es)
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In this work, a geophysical characterization of the subsoil of a civil structure corresponding to the basement of a residential complex in Bogotá, Colombia was carried out, using the GPR technique. We were chosen to establish the affectation caused by weeping willow (Salix Babylonica) trees planted near the retaining wall of the structure’s foundation and its parking lot platforms. We acquired GPR profiles all throughout the area of the internal part of the basement and the outer retaining wall part. The pieces of equipment used were SIR 4000 and a HS 350 MHz center frequency antenna. The data presented a good and consistent signal. High resolution subsoil images of up to 3m in depth of the area below the parking lots were generated through the analysis of information derived from the processing and interpretation of the data. All of these were compared with information from geotechnical and topographic studies of the area. The results obtained show that the trees’ roots are causing scour due to a drying effect of the subsoil, which caused damage to the slab in the parking lot and on the retaining wall.
En este trabajo, se realizó la evaluación geofísica del subsuelo de una estructura civil correspondiente al sótano de un conjunto residencial en Bogotá, Colombia, utilizando la técnica de GPR. Se seleccionó el área para establecer el impacto causado por árboles de sauce llorón (Salix babylonica) plantados cerca del muro de contención de la cimentación de la estructura y de las plataformas del parqueadero. Se adquirieron perfiles de GPR en toda el área de la parte interna del sótano y en la parte externa del muro de contención. El equipo utilizado fue el SIR 4000 con una antena de frecuencia central de 350 MHz. Los datos presentaron una señal buena y consistente. A través del análisis de la información derivada del procesamiento e interpretación de los datos, se generaron imágenes de alta resolución del subsuelo, alcanzando profundidades de hasta 3 m en el área debajo de los parqueaderos. Toda esta información se comparó con estudios geotécnicos y topográficos de la zona. Los resultados obtenidos muestran que las raíces de los árboles están causando socavación debido a un efecto de desecación del subsuelo, lo cual ha generado daños en la losa del parqueadero y en el muro de contención.
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