气候变化领域集成服务门户(CCPortal): Constraining Internal States in Progressive Rock Failure of Carrara Marble by Measuring Residual Strains With Neutron Diffraction

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DOI	10.1029/2020JB019917
	Constraining Internal States in Progressive Rock Failure of Carrara Marble by Measuring Residual Strains With Neutron Diffraction
	Voigtländer A.; Leith K.; Walter J.M.; Krautblatter M.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	Knowledge of the internal state of rock is key to anticipate its rheological response and susceptibility to external factors. Time-dependent failure in rock is controlled by internal state changes, like damage accumulation or strength degradation. But assessing internal states and changes thereof, nondestructively and independent of external forcing is not straightforward. Residual strains, measured with neutron diffraction techniques are used as a proxy for the internal state in material sciences. We investigated its potential for progressive rock failure by measuring residual strain states of an untested and three mechanically and chemomechanically pretested Carrara marble samples. We collected neutron diffraction data for three crystal lattice planes {10̅14}, {0006}, and {11̅20}. Measurements showed an initial overall contractional spatially homogeneous residual unit cell volume strain state of about −400 μstrain, though magnitudes were strongly partitioned among measured crystal lattice planes. However, they are equal within the spatial orientations of the intact sample. For the pretested samples, the induction and relaxation of strains varied spatially with the pretesting stress field and environmental conditions. The vertical extent of superposition of the initial residual strain state was greatest in wet samples, the magnitude of induced extensional strain highest in the dry sample. This indicates chemomechanically enhanced subcritical crack growth with concomitant residual strain relaxation as well as the mitigation of extensional strain built up by the presence of water during pretesting. Our experiments show that residual strain has a significant potential to provide insights into past and actual internal states to anticipate progressive rock failure. ©2020. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187801
作者单位	Landslide Research Group, Technical University of Munich, Munich, Germany; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany; Department of Earth Sciences, ETH Zurich, Zurich, Switzerland; Geoscience Center, University of Göttingen, Göttingen, Germany
推荐引用方式 GB/T 7714	Voigtländer A.,Leith K.,Walter J.M.,et al. Constraining Internal States in Progressive Rock Failure of Carrara Marble by Measuring Residual Strains With Neutron Diffraction[J],2020,125(6).
APA	Voigtländer A.,Leith K.,Walter J.M.,&Krautblatter M..(2020).Constraining Internal States in Progressive Rock Failure of Carrara Marble by Measuring Residual Strains With Neutron Diffraction.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Voigtländer A.,et al."Constraining Internal States in Progressive Rock Failure of Carrara Marble by Measuring Residual Strains With Neutron Diffraction".Journal of Geophysical Research: Solid Earth 125.6(2020).