Identifying the changes of geo-engineering properties of dunites due to weathering utilizing electrical resistivity tomography (ERT)

Ündül, Ömer; Tuğrul, Atíye; Özyalın, Şenol; Zarif, I. H.

doi:10.1088/1742-2132/12/2/273

Cited by 8 publications

(7 citation statements)

References 29 publications

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“…All values of the uniaxial compressive strength are depicted in Figure 8 . The compressive strength decreases with increasing weathering [ 13 ]. Therefore, it is expected to show lower values with increasing weathering.…”

Section: Resultsmentioning

confidence: 99%

“…The results of the Brazilian test are depicted in Figure 9 . Like the results of the uniaxial compressive strength test, the tensile strength of a sample is expected to decrease with increased weathering [ 13 ], but all samples show weathering stage II from the outside with little differences.…”

Section: Resultsmentioning

confidence: 99%

“…In all drillings, a serpentinization, especially along fractures and joints, could be observed, besides oxidation processes (brown colored areas). According to literature dealing with weathering of ultramafic rocks [ 10 , 12 , 13 , 14 ], this serpentinization is a characteristic weathering process of dunite rock. Normally, serpentinization only takes place in hydrothermal regimes with water temperatures above 100 °C [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

“…This underlines the extreme heterogeneous structure and behavior of the Medellín Dunite. A common weathering profile (decreasing weathering with increasing depth) would show increasing compressive strength, tensile strength and grain sizes with increasing depth [ 13 , 14 ]. Despite the missing correlation between the depth and the values of the rock test results, the values do vary extremely with 10 MPa–132 MPa for uniaxial compressive strength and 4.1 MPa–17.5 MPa for tensile strength.…”

Section: Discussionmentioning

confidence: 99%

“…Since Medellín is located in a tropical environment, chemical weathering is a strong influencing factor on the subsurface composition. When in contact with water, the rock is altered by degradation into clay minerals and due to oxidation to iron oxides and hydroxides, which weakens the rock’s structure and decreases its compressive strength continuously [ 13 ]. The higher the content of olivine in the rock (“pure” dunite), the stronger the weathering [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation of Critical Geotechnical, Petrological and Mineralogical Parameters for Landslides in Deeply Weathered Dunite Rock (Medellín, Colombia)

Breuninger

Menschik

Demharter

et al. 2021

IJERPH

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The current study site of the project Inform@Risk is located at a landslide prone area at the eastern slopes of the city of Medellín, Colombia, which are composed of the deeply weathered Medellín Dunite, an ultramafic Triassic rock. The dunite rock mass can be characterized by small-scale changes, which influence the landslide exposition to a major extent. Due to the main aim of the project, to establish a low-cost landslide early warning system (EWS) in this area, detailed field studies, drillings, laboratory and mineralogical tests were conducted. The results suggest that the dunite rock mass shows a high degree of serpentinization and is heavily weathered up to 50 m depth. The rock is permeated by pseudokarst, which was already found in other regions of this unit. Within the actual project, a hypothesis has for the first time been established, explaining the generation of the pseudokarst features caused by weathering and dissolution processes. These parameters result in a highly inhomogeneous rock mass and nearly no direct correlation of weathering with depth. In addition, the theory of a secondary, weathering serpentinization was established, explaining the solution weathering creating the pseudokarst structures. This contribution aims to emphasize the role of detailed geological data evaluation in the context of hazard analysis as an indispensable data basis for landslide early warning systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%