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The degradation effect and mechanism by water-rock interaction in the layered sandstone in the Three Gorges reservoir area

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Abstract

Cyclic wetting and drying process of the reservoir area has been affecting the long term stability of the reservoir area at the bankside (due to the degradation in the physio-mechanical properties of the sandstone). To simulate this phenomenon, an experimental program was designed and executed on the layered sandstone brought from the Three Gorges reservoir area. The following points were noticed based on the laboratory results: (1) The degradation trends of the deformation and strength properties of the layer sandstone rock were very noticeable during the water-rock interaction. (2) Water plays a significant role in the softening and weakening of processes of the layered sandstone. The degradation in the physio-mechanical properties of layered sandstone was attributed to micro-structural changes. (3) The degradation in the mechanical properties of layered sandstone were mainly due to the dissolution of weak planes. The findings of this research provide a good basis for stability analysis of bank slope.

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Funding

This work was supported by the National Nature Science foundation of China (No.51439003), National Nature Science foundation of China (No.51679127), the National key research and development plan( NO. 2016YFC0401607, NO. 2016YFC0400200),and Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education open fund project (No. 2018KDZ04).

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Correspondence to Huafeng Deng.

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Responsible Editor: Zeynal Abiddin Erguler

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Jiang, Q., Deng, H., Li, J. et al. The degradation effect and mechanism by water-rock interaction in the layered sandstone in the Three Gorges reservoir area. Arab J Geosci 12, 722 (2019). https://doi.org/10.1007/s12517-019-4943-6

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