Thomas Frühwirt
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View article: Cyclic shear test device for rock: an add-on for a uniaxial compression test rig
Cyclic shear test device for rock: an add-on for a uniaxial compression test rig Open
Rock discontinuities play a crucial role for the mechanical behavior of surface and subsurface formations, significantly affecting the stability of slopes, underground mines, geoenergy systems, including geothermal reservoirs, carbon seque…
View article: Mechanical property variation mechanisms of granite subjected to real‐time high temperatures and subsequent cooling treatment
Mechanical property variation mechanisms of granite subjected to real‐time high temperatures and subsequent cooling treatment Open
During geothermal resource exploitation, the potential deterioration of mechanical properties in high‐temperature granite subjected to cooling poses a significant safety concern. To address this, the present study investigates the coupled …
View article: Argillaceous Soft Rock in-situ Test Program in Tunneling
Argillaceous Soft Rock in-situ Test Program in Tunneling Open
This study undertakes a comprehensive examination of the characteristics of the argillaceous, hard soil/soft rock (HSSR) lithology of the Unterangerberg formation in Tyrol, Austria, focusing on its swelling properties and anisotropic mater…
View article: In-field Verification of the Applicability of MEMS-IMU Accelerometers for Monitoring of Mining-induced Seismic Activity
In-field Verification of the Applicability of MEMS-IMU Accelerometers for Monitoring of Mining-induced Seismic Activity Open
Measurements of seismic activity induced by mining operations are a basic tool for assessing the level of dynamic load associated with the occurrence of tremors. Knowledge of the location of the source of vibrations and the nature of seism…
View article: Towards a rapid and practical determination of the pin-rock interaction parameters of the CERCHAR abrasivity test
Towards a rapid and practical determination of the pin-rock interaction parameters of the CERCHAR abrasivity test Open
The CERCHAR test is a widely used index test for evaluating rock abrasiveness and associated tool wear in rock excavation. However, routine testing only assesses the wear on the pin itself. To evaluate the advancement rates in rock cutting…
View article: Experimental investigation of abrasive potential and drilling efficiency at elevated temperatures via Cerchar rock scratching
Experimental investigation of abrasive potential and drilling efficiency at elevated temperatures via Cerchar rock scratching Open
To see if and how abrasive potential as well as drilling efficiency change due to rock heating, Cerchar scratch tests were performed on six types of rock at eight temperature levels. Results indicate that rock abrasivity is temperature-dep…
View article: Assessment of Direct Tensile Strength Tests in Rock Through a Multi-laboratory Benchmark Experiment
Assessment of Direct Tensile Strength Tests in Rock Through a Multi-laboratory Benchmark Experiment Open
This study aims to experimentally assess repeatability and reproducibility of direct tensile strength (DTS) tests with deformability measurements on two types of rocks: Blanco Mera granite (Spain) and Cotta sandstone (Germany). The tests w…
View article: Elastic Behavior of Transversely Isotropic Cylindrical Rock Samples under Uniaxial Compression Considering Ideal and Frictional Boundary Conditions
Elastic Behavior of Transversely Isotropic Cylindrical Rock Samples under Uniaxial Compression Considering Ideal and Frictional Boundary Conditions Open
Conceptualizing sophisticated measurement set-ups as well as testing and evaluation procedures for laboratory experiments on anisotropic rocks requires a basic understanding of the potential specimen behavior. The focus of the present work…
View article: Gas Permeability Evolution of Coal with Inclusions under Triaxial Compression-Lab Testing and Numerical Simulations
Gas Permeability Evolution of Coal with Inclusions under Triaxial Compression-Lab Testing and Numerical Simulations Open
Coalbed methane (CBM) exploitation leads to permanent stress redistributions in the coal bodies connected with fracturing processes and permeability changes due to deformation induced internal pore-fracture networks. Gas permeability evolu…
View article: Simulation of direct shear tests using a forces on fracture surfaces (FFS) approach
Simulation of direct shear tests using a forces on fracture surfaces (FFS) approach Open
The aim of this work is to provide a complete data set of direct shear tests and to propose a corresponding simulation approach. Tests have been conducted on crystalline rock samples applying constant normal load (CNL) and constant normal …
View article: Model-Experiment-Exercises (MEX)
Model-Experiment-Exercises (MEX) Open
The basic idea of Model-Experiment-Exercises (MEX) is to link modelling and experimental works from the very beginning i.e. in the conceptual phase. Due to the complexity of each part in the systems analysis, this combination is sometimes …
View article: Experimental Platform
Experimental Platform Open
In order to investigate the barrier rocks, such as saltstone, claystone and crystalline, response under the coupled thermo-hydro-mechanical (THM) processes, a series of laboratory and field tests in the scope of the GeomInt project are car…
View article: Laboratory testing and numerical simulation of properties and thermal-induced cracking of Eibenstock granite at elevated temperatures
Laboratory testing and numerical simulation of properties and thermal-induced cracking of Eibenstock granite at elevated temperatures Open
The knowledge about thermo-mechanical properties of granite is still limited to some extent. Individual measurements are necessary to obtain reliable properties for specific granite types. A reliable numerical model of thermal cracking beh…
View article: A Parametric Study Using Numerical Modelling to Assess the Stability of Marble Quarries
A Parametric Study Using Numerical Modelling to Assess the Stability of Marble Quarries Open
Marble quarries, are located at 3 km southeast of the city of Afyon İscehisar. The marble bed is lens shaped has a thickness of 300 meters. İscehisar is on south of the city center and marble bed extends through NW-SE direction for 6 km lo…