Rola obrazowania elektrooporowego w uszczegółowieniu skomplikowanej budowy geologicznej wzgórza Morasko w Poznaniu
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2016-Artykuł_Morasko.pdf (869.43 KB)
Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
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Abstract
The paper focuses on the problem of elaborating reliable geological models based on point data from drillings and two-dimensional results of geophysical surveys with application of electrical resistivity tomography (ERT). The study area was the Morasko Hill in Poznań (Poland). The Morasko Hill is located within frontal moraines lying on Pliocene clays with a top surface strongly deformed by glaciotectonics. Due to the presence of these deformations, the analysed area is characterized by a complex geological structure. Analysis of archival logs of drillings has indicated that the top surface of the Pliocene clays is extremely variable, hampering unequivocal determination of geological boundaries. ERT measurements were used to recognize the detailed geological structure of the area. Next, additional drillings and CPTU soundings were made in selected localities characterized by anomalies in the distribution of electrical resistivity values. Following the drillings and soundings, the results of the geophysical survey were reinterpreted. Such complex methodology of field work, including geophysical and geological surveys, allowed to present a reliable geological model of the area, in which the ERT results coincided with the drilling results. In practice, the preparation of an appropriate geological model, particularly in the vicinity of escarpments and slopes, is indispensable for designers of construction objects in the selection of foundations and analysis of slope stability.