A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Dynamic Mechanical Properties of Dry and Water-Saturated Siltstones Under Sub-Zero Temperatures
https://orcid.org/0000-0001-7475-660X
Abstract The effects of low temperature and strain rate on the dynamic mechanical properties of dry and saturated siltstones under sub-zero temperatures were investigated and presented in this paper. The siltstone specimens were first frozen to different sub-zero temperatures (from − 10 to − 50 °C), and then were tested at those temperatures using a split Hopkinson pressure bar (SHPB) system. The results indicated that compared to the dry specimens, the saturated specimens exhibit a much shorter compaction phase in the dynamic stress–strain curve due to the presence of the pore water or ice at sub-zero temperatures. The dynamic elastic modulus (Ed) and dynamic uniaxial compressive strength ($ UCS_{d} $) monotonically increase with the increase in the strain rate for both the dry and saturated specimens, and the dry specimens are more sensitive to the strain rate effect with respect to the $ UCS_{d} $. Furthermore, for both the dry and saturated specimens, the Ed and $ UCS_{d} $ first increase with the decrease in the temperature from 18 to − 30 °C, and then decrease with a further drop in the temperature from − 30 to − 50 °C. Manifold reasons are responsible for this phenomenon, including the shrinkage of mineral grains, enhancement of the ice strength and interaction of the water/ice mixture with rock as the temperature drops. Using the NMR technique, the mechanisms of the mixed water/ice weakening and strengthening effects on the dynamic mechanical properties of siltstones at sub-zero temperatures were discussed.
Dynamic Mechanical Properties of Dry and Water-Saturated Siltstones Under Sub-Zero Temperatures
https://orcid.org/0000-0001-7475-660X
Abstract The effects of low temperature and strain rate on the dynamic mechanical properties of dry and saturated siltstones under sub-zero temperatures were investigated and presented in this paper. The siltstone specimens were first frozen to different sub-zero temperatures (from − 10 to − 50 °C), and then were tested at those temperatures using a split Hopkinson pressure bar (SHPB) system. The results indicated that compared to the dry specimens, the saturated specimens exhibit a much shorter compaction phase in the dynamic stress–strain curve due to the presence of the pore water or ice at sub-zero temperatures. The dynamic elastic modulus (Ed) and dynamic uniaxial compressive strength ($ UCS_{d} $) monotonically increase with the increase in the strain rate for both the dry and saturated specimens, and the dry specimens are more sensitive to the strain rate effect with respect to the $ UCS_{d} $. Furthermore, for both the dry and saturated specimens, the Ed and $ UCS_{d} $ first increase with the decrease in the temperature from 18 to − 30 °C, and then decrease with a further drop in the temperature from − 30 to − 50 °C. Manifold reasons are responsible for this phenomenon, including the shrinkage of mineral grains, enhancement of the ice strength and interaction of the water/ice mixture with rock as the temperature drops. Using the NMR technique, the mechanisms of the mixed water/ice weakening and strengthening effects on the dynamic mechanical properties of siltstones at sub-zero temperatures were discussed.
Dynamic Mechanical Properties of Dry and Water-Saturated Siltstones Under Sub-Zero Temperatures
https://orcid.org/0000-0001-7475-660X
Abstract The effects of low temperature and strain rate on the dynamic mechanical properties of dry and saturated siltstones under sub-zero temperatures were investigated and presented in this paper. The siltstone specimens were first frozen to different sub-zero temperatures (from − 10 to − 50 °C), and then were tested at those temperatures using a split Hopkinson pressure bar (SHPB) system. The results indicated that compared to the dry specimens, the saturated specimens exhibit a much shorter compaction phase in the dynamic stress–strain curve due to the presence of the pore water or ice at sub-zero temperatures. The dynamic elastic modulus (Ed) and dynamic uniaxial compressive strength ($ UCS_{d} $) monotonically increase with the increase in the strain rate for both the dry and saturated specimens, and the dry specimens are more sensitive to the strain rate effect with respect to the $ UCS_{d} $. Furthermore, for both the dry and saturated specimens, the Ed and $ UCS_{d} $ first increase with the decrease in the temperature from 18 to − 30 °C, and then decrease with a further drop in the temperature from − 30 to − 50 °C. Manifold reasons are responsible for this phenomenon, including the shrinkage of mineral grains, enhancement of the ice strength and interaction of the water/ice mixture with rock as the temperature drops. Using the NMR technique, the mechanisms of the mixed water/ice weakening and strengthening effects on the dynamic mechanical properties of siltstones at sub-zero temperatures were discussed.
Dynamic Mechanical Properties of Dry and Water-Saturated Siltstones Under Sub-Zero Temperatures
Weng, Lei (author) / Wu, Zhijun (author) / Liu, Quansheng (author)
2020
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
Dam of argillites and siltstones
| Online Contents | 1983
Dam of argillites and siltstones
| Springer Verlag | 1983
Dynamic compression properties of a saturated white sandstone under ambient sub-zero temperatures
| Springer Verlag | 2023
Anisotropic strength and stiffness properties of some UK Coal Measure siltstones
| Online Contents | 2002
Siltstones, Mudstones and Shales: Depositional Processes and Characteristics
| British Library Conference Proceedings | 2003