Neufassung der Empfehlung Nr. 1 des Arbeitskreises “Versuchstechnik Fels” der Deutschen Gesellschaft für Geotechnik e. V.: Einaxiale Druckversuche an zylindrischen Gesteinsprüfkörpern

Mutschler, Thomas

doi:10.1002/bate.200490194

Cited by 54 publications

(23 citation statements)

References 2 publications

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“…Elastic properties are derived from laboratory tests (Draebing & Krautblatter, 2012) and complement modeled CD ice to calculate ice pressures σ ice (Jia et al, 2017) and ice stress intensity factors K ice (Jia et al, 2017;Tharp, 1987). Rock strength parameters are quantified in the lab (Chang et al, 2002;Lepique, 2008;Mutschler, 2004) on the tested rock samples (AP and AM) or rock samples from same lithology (QS and MS) to evaluate cracking efficacy of applied tests (see Texts S2-S4).…”

Section: Methodsmentioning

confidence: 99%

The Efficacy of Frost Weathering Processes in Alpine Rockwalls

Draebing

Krautblatter

2019

Geophysical Research Letters

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Weathering processes prepare and trigger rockfall, which is a key agent of alpine landscape evolution and a hazardous process. The relative importance of different weathering processes is hard to decipher; nevertheless, current knowledge assumes a dominant role of frost cracking in eroding alpine rockwalls. This study uses a laboratory approach to simulate volumetric expansion and ice segregation in four alpine rock samples, monitors crack deformation, and quantifies frost weathering efficacy. Our results show that short‐term volumetric expansion in cracks provides stresses up to 10 MPa over hours, while long‐term ice segregation causes stresses of 1 MPa over days. While volumetric expansion in fall can reach critical fracture levels, volumetric expansion in early summer and ice segregation rather approaches subcritical fracture propagation levels. We conclude that subcritical crack propagation is the dominant antecedent process of rockfall initiation, which can be amplified by rare critical cracking due to volumetric expansion.

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Section: Methodsmentioning

confidence: 99%

The Efficacy of Frost Weathering Processes in Alpine Rockwalls

Draebing

Krautblatter

2019

Geophysical Research Letters

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“…For calculations of porosity Φ, measurements of bulk density ρ d and of grain density ρ s via pycnometer were done. Static geomechanical parameters were determined by uniaxial and triaxial compressive as well as Brazilian disc tensile strength test series according to ISRM and DGGT suggested methods [9,10]. Mode I fracture toughness was determined using the Chevron notched three-point bending test according to [9].…”

Section: Sample Preparation and Rock Testingmentioning

confidence: 99%

Hydraulic and Sleeve Fracturing Laboratory Experiments on 6 Rock Types

Brenne¹,

Molenda²,

Stöckhert³

et al. 2013

Effective and Sustainable Hydraulic Fracturing

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“…A second uniaxial compression test was performed according to Mutschler (2004) with constant loading until failure without PTFE plates. From the number of AE events different stages of crack development could be determined (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…81.1). Samples were prepared for testing with a diameter of 8 cm and a length to diameter ratio of 2:1 (Mutschler 2004). Uniaxial loading was applied under servo-control at a constant velocity rate of 0.1 mm/min.…”

Section: Methodsmentioning

confidence: 99%

Acoustic Emission Technique to Detect Micro Cracking During Uniaxial Compression of Brittle Rocks

Wieser

Käsling

Raith

et al. 2014

Engineering Geology for Society and Territory - Volume 6

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Excavation of deep underground openings causes redistribution of primary stresses and induces initiation and propagation of micro cracks. Changes in rock properties ahead of an advancing tunnel face may influence stability and penetration rates in TBM tunneling. This study is part of a PhD project where the focus is on stress-induced micro cracking and its influence on rock strength reduction. We demonstrate results from acoustic emission (AE) measurements on two homogeneous diorite samples tested under uniaxial compression. The aim was to gain information about the influence of experimental setup and settings on AE events in brittle rock. From the stress strain curve and the number of acoustic signals, main deformation stages could be determined. A three-dimensional localization of acoustic events showed a typical conjugate shear system. Future work will include tests on different rock types after inducing controlled damage by uniaxial loading. Lateral strain measurements combined with AE analysis will be applied in order to quantify rock damage and its influence on rock strength.

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Neufassung der Empfehlung Nr. 1 des Arbeitskreises “Versuchstechnik Fels” der Deutschen Gesellschaft für Geotechnik e. V.: Einaxiale Druckversuche an zylindrischen Gesteinsprüfkörpern

Cited by 54 publications

References 2 publications

The Efficacy of Frost Weathering Processes in Alpine Rockwalls

The Efficacy of Frost Weathering Processes in Alpine Rockwalls

Hydraulic and Sleeve Fracturing Laboratory Experiments on 6 Rock Types

Acoustic Emission Technique to Detect Micro Cracking During Uniaxial Compression of Brittle Rocks

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