A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental Compaction and Dilation of Porous Rocks During Triaxial Creep and Stress Relaxation
https://orcid.org/0000-0002-8127-5684
Abstract Time-dependent rock deformation affects both natural processes happening on the geological time scale and subsurface engineering operations. We perform a series of multistage triaxial experiments on a set of natural limestone and artificial samples. We study rock response during creep and stress relaxation tests, which are two endmembers of time-dependent rock response. The tests were conducted at room temperature and low confining pressure. We find that all rock samples showed pronounced creep and stress relaxation both at low-stress levels corresponding to half of the yield stress and higher stresses corresponding to yield stress. Associated values of bulk and shear viscosities lie in the range of $ 10^{15} $–$ 10^{17} $ Pa s for artificial and $ 10^{15} $–$ 10^{16} $ Pa s for limestone samples at critical stresses corresponding to failure limits. At low stresses, effective viscosities are significantly higher. Bulk viscosity is up to two times higher than shear viscosity. Viscosity values correlate well with failure properties. Samples with low strength show the lowest values of viscosities. All samples exhibited significant dilation during creep experiments, which was not associated with the formation of the macroscale fracture or strain localization. Creep and stress relaxation tests show different stress–strain rate behavior.
Experimental Compaction and Dilation of Porous Rocks During Triaxial Creep and Stress Relaxation
https://orcid.org/0000-0002-8127-5684
Abstract Time-dependent rock deformation affects both natural processes happening on the geological time scale and subsurface engineering operations. We perform a series of multistage triaxial experiments on a set of natural limestone and artificial samples. We study rock response during creep and stress relaxation tests, which are two endmembers of time-dependent rock response. The tests were conducted at room temperature and low confining pressure. We find that all rock samples showed pronounced creep and stress relaxation both at low-stress levels corresponding to half of the yield stress and higher stresses corresponding to yield stress. Associated values of bulk and shear viscosities lie in the range of $ 10^{15} $–$ 10^{17} $ Pa s for artificial and $ 10^{15} $–$ 10^{16} $ Pa s for limestone samples at critical stresses corresponding to failure limits. At low stresses, effective viscosities are significantly higher. Bulk viscosity is up to two times higher than shear viscosity. Viscosity values correlate well with failure properties. Samples with low strength show the lowest values of viscosities. All samples exhibited significant dilation during creep experiments, which was not associated with the formation of the macroscale fracture or strain localization. Creep and stress relaxation tests show different stress–strain rate behavior.
Experimental Compaction and Dilation of Porous Rocks During Triaxial Creep and Stress Relaxation
https://orcid.org/0000-0002-8127-5684
Abstract Time-dependent rock deformation affects both natural processes happening on the geological time scale and subsurface engineering operations. We perform a series of multistage triaxial experiments on a set of natural limestone and artificial samples. We study rock response during creep and stress relaxation tests, which are two endmembers of time-dependent rock response. The tests were conducted at room temperature and low confining pressure. We find that all rock samples showed pronounced creep and stress relaxation both at low-stress levels corresponding to half of the yield stress and higher stresses corresponding to yield stress. Associated values of bulk and shear viscosities lie in the range of $ 10^{15} $–$ 10^{17} $ Pa s for artificial and $ 10^{15} $–$ 10^{16} $ Pa s for limestone samples at critical stresses corresponding to failure limits. At low stresses, effective viscosities are significantly higher. Bulk viscosity is up to two times higher than shear viscosity. Viscosity values correlate well with failure properties. Samples with low strength show the lowest values of viscosities. All samples exhibited significant dilation during creep experiments, which was not associated with the formation of the macroscale fracture or strain localization. Creep and stress relaxation tests show different stress–strain rate behavior.
Experimental Compaction and Dilation of Porous Rocks During Triaxial Creep and Stress Relaxation
Sabitova, Alina (author) / Yarushina, Viktoriya M. (author) / Stanchits, Sergey (author) / Stukachev, Vladimir (author) / Khakimova, Lyudmila (author) / Myasnikov, Artem (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Creep compaction of porous rock
| British Library Conference Proceedings | 1981
Stress-Dilation of Undisturbed Sand Samples in Drained and Undrained Triaxial Shear
| British Library Online Contents | 2007
Modelling of Dilation of Concrete in Triaxial Compression
| British Library Conference Proceedings | 2002