A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Study on deterioration characteristics of combustion metamorphic rocks under dry–wet cycling
Abstract Spontaneous combustion disasters occur in coal seams worldwide. Under high-temperature baking by a coal fire, surrounding rocks are metamorphosed to form combustion metamorphic (CM) rocks. To study the characteristics of erosion and deterioration of CM rocks water on CM rocks, a dry–wet cycling experiment was conducted. A $ Na_{2} $$ SO_{4} $ solution was used to wet CM rock samples obtained from several strata above the site of a coal seam fire, which were then oven-dried, and the process repeated for 50 cycles. Low-field nuclear magnetic resonance analysis found that the pore structures changed greatly. Porosity increased and then decreased with cycling, while the pore size distribution increased. The proportion of micropores decreased first and then increased, while that of macropores increased and then decreased. After 50 dry–wet cycles, the sample quality, hardness, and surface gloss decreased, while the surface roughness increased. Five weathering erosion types were identified: spherical, central, powdery, and interface types I and II. The rock pore structure and degree of combustion metamorphosis influence erosion, with the latter improving the erosion resistance.
Study on deterioration characteristics of combustion metamorphic rocks under dry–wet cycling
Abstract Spontaneous combustion disasters occur in coal seams worldwide. Under high-temperature baking by a coal fire, surrounding rocks are metamorphosed to form combustion metamorphic (CM) rocks. To study the characteristics of erosion and deterioration of CM rocks water on CM rocks, a dry–wet cycling experiment was conducted. A $ Na_{2} $$ SO_{4} $ solution was used to wet CM rock samples obtained from several strata above the site of a coal seam fire, which were then oven-dried, and the process repeated for 50 cycles. Low-field nuclear magnetic resonance analysis found that the pore structures changed greatly. Porosity increased and then decreased with cycling, while the pore size distribution increased. The proportion of micropores decreased first and then increased, while that of macropores increased and then decreased. After 50 dry–wet cycles, the sample quality, hardness, and surface gloss decreased, while the surface roughness increased. Five weathering erosion types were identified: spherical, central, powdery, and interface types I and II. The rock pore structure and degree of combustion metamorphosis influence erosion, with the latter improving the erosion resistance.
Study on deterioration characteristics of combustion metamorphic rocks under dry–wet cycling
Hu, Xin (author) / Sun, Qiang (author) / Wang, Shaofei (author) / Wei, Shaoni (author) / Ding, Xiaoying (author) / Zhao, Xiaochen (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
| Landolt-Börnstein / Springer Materials | 1982
Study on Al Alloy Welded Joint Performance Deterioration under Thermal Cycling Condition
| British Library Online Contents | 2007
Strain softening behaviour of two metamorphic rocks
| British Library Conference Proceedings | 2006
A quantitative petrofabric characterization of metamorphic rocks
| Online Contents | 1986