Characteristics of water absorption capacity of weathered sandstone based on nuclear magnetic resonance and wave velocity testing

NIU Ran; JIANG Xiaowei; YAN Yongshuai; OUYANG Kaigao; SUN Xianchun; YAN Hongbin; WAN Li

doi:10.16030/j.cnki.issn.1000-3665.202403055

2025 Vol. 52, No. 2

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NIU Ran, JIANG Xiaowei, YAN Yongshuai, OUYANG Kaigao, SUN Xianchun, YAN Hongbin, WAN Li. Characteristics of water absorption capacity of weathered sandstone based on nuclear magnetic resonance and wave velocity testing[J]. Hydrogeology & Engineering Geology, 2025, 52(2): 63-71. doi: 10.16030/j.cnki.issn.1000-3665.202403055

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NIU Ran, JIANG Xiaowei, YAN Yongshuai, OUYANG Kaigao, SUN Xianchun, YAN Hongbin, WAN Li. Characteristics of water absorption capacity of weathered sandstone based on nuclear magnetic resonance and wave velocity testing[J]. Hydrogeology & Engineering Geology, 2025, 52(2): 63-71. doi: 10.16030/j.cnki.issn.1000-3665.202403055

Characteristics of water absorption capacity of weathered sandstone based on nuclear magnetic resonance and wave velocity testing

1.
MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences （Beijing）, Beijing　100083, China
2.
School of Hydraulic Engineering, Yellow River Conservancy Technical Institute, Kaifeng, Henan　475004, China
3.
Beijing Urban Construction Rail Transit Construction Engineering Co. Ltd., Beijing　100088, China
4.
Yungang Research Institute, Datong, Shanxi　037034, China

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Corresponding author: JIANG Xiaowei, jxw@cugb.edu.cn

Received Date: 18 March 2024

Revised Date: 07 June 2024

Publish Date: 15 March 2025

Abstract

Abstract

Water is a key factor in the weathering and erosion of rocks, and highly porous rocks are generally more susceptible to weathering. However, there has been a lack of in-situ methods for assessing the water absorption capacity of rocks. To investigate the controlling factors of rock water absorption capacity, sandstone with different degrees of weathering collected from the Yungang Grottoes were selected as the study material. Nuclear magnetic resonance (NMR) technology was employed to test the porosity and pore size distribution of rock samples, and to establish the relationship between the free water absorption rate of sandstone and its density, porosity, and pore size. The results indicate that there is a linear relationship between the free water absorption rate and the density of sandstone, with the slope of the relationship being influenced by the degree of weathering. Additionally, the free water absorption rate of the sandstone is positively correlated with porosity and the proportion of small pores (0.1－1.0 μm), with porosity being the primary controlling factor and pore structure being the secondary controlling factor. This study deepens our understanding of the mechanisms controlling the water absorption of weathered sandstone. Furthermore, since wave velocity is also influenced by porosity and pore structure, a good linear relationship was observed between the free water absorption rate and wave velocity. Therefore, it is suggested that the free water absorption rate of rock mass can be estimated by in-situ testing of wave velocity.
- porosity /
- water absorption /
- acoustic wave velocity /
- pore size distribution /
- nuclear magnetic resonance

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References

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