白鹤滩库首区砂岩结构多尺度演变机制

李长冬; 孟杰; 项林语; 黄德崴; 崔宇寒

doi:10.3799/dqkx.2022.486

Volume 48 Issue 12

Dec. 2023

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Article Navigation > Earth Science > 2023 > 48(12): 4658-4667

Li Changdong, Meng Jie, Xiang Linyu, Huang Dewei, Cui Yuhan, 2023. Multi-Scale Evolution Mechanism of Sandstone Structure in Baihetan Reservoir Head Region. Earth Science, 48(12): 4658-4667. doi: 10.3799/dqkx.2022.486

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Li Changdong, Meng Jie, Xiang Linyu, Huang Dewei, Cui Yuhan, 2023. Multi-Scale Evolution Mechanism of Sandstone Structure in Baihetan Reservoir Head Region. Earth Science, 48(12): 4658-4667. doi: 10.3799/dqkx.2022.486

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Multi-Scale Evolution Mechanism of Sandstone Structure in Baihetan Reservoir Head Region

doi: 10.3799/dqkx.2022.486

Li Changdong^{1, 2
,
,},
Meng Jie^{1, 2},
Xiang Linyu¹,
Huang Dewei¹,
Cui Yuhan¹

1.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2.
Badong National Observation and Research Station of Geohazards, China University of Geosciences, Wuhan 430074, China

Received Date: 2022-10-18
Available Online: 2024-01-03
Publish Date: 2023-12-25

Abstract

Abstract

It is of great significance to elucidate the multi-scale evolution mechanism of rock structures under the action of wetting and drying cycles in the field of engineering geology. However, due to the randomness and disorder of complex structural systems, it is extremely challenging to elucidate the relationship between microstructure and macroscopic mechanical structural properties. Taking the sandstone near the dam site of the Baihetan Hydropower Station as the research object, various fine testing techniques (including NMR, μCT and SEM) were adopted to explore the evolution characteristics of the mechanical properties, pore fracture characteristics and mineral structure of sandstone in different stages of wetting and drying cycles. When water molecules were absorbed by hydrophilic minerals, the surface hydration film thickened, and the swelling pressure led to the destruction of aggregates. With the increase in the number of wetting and drying cycles, the number of small pores and pore size increased, while the number of large pore size did not show a monotonically increasing trend. The pore-fracture connectivity was significantly improved during wetting and drying cycles, resulting in an exponential decline in the uniaxial compressive strength of sandstone, and the fracture surfaces tended to be complicated. Finally, the multiscale evolution mechanism of the sandstone structure was revealed based on detailed microstructure evolution observations and mineral-water molecular simulation results. The research results are of great significance to the study of geological hazards induced by rock structure deterioration.
- sandstone,
- microstructure,
- multi-scale structure evolution,
- cycles of wetting and drying,
- mineral,
- engineering geology

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References(44)

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Multi-Scale Evolution Mechanism of Sandstone Structure in Baihetan Reservoir Head Region

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