Research on Wetting Deformation Model of Coarse-Grained Materials of Earth-rock Dam

• Published in: Arabian journal of geosciences Vol. 15; no. 4
• Main Authors: Zhang, Hongyang, Han, Pengju, He, Qin, Sun, Yadong, Song, Ziyi, Ding, Zelin, Niu, Ang
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.02.2022; Springer Nature B.V
• Subjects: Artificial neural networks; Axial strain; Axial stress; Confining; Deformation; Deformation analysis; Deformation test; Earth; Earth and Environmental Science; Earth science; Earth Sciences; Mathematical models; Model accuracy; Model testing; Neural networks; Numerical analysis; Original Paper; Parameters; Rocks; Strain; Volumetric strain; Wetting; Single-line method; Wetting stress level; Coarse-grained materials; Artificial neural network; Wetting model; Wetting test
• ISSN: 1866-7511; 1866-7538
• DOI: 10.1007/s12517-022-09619-w

Wetting deformation of coarse-grained materials is an essential factor affecting the safe operation of earth-rock dams. However, conventional coarse-grained materials wetting deformation analysis models have problems such as too many parameters, and the parameters determined by experiments are used in actual engineering calculation results. To accurately reflect the wetting deformation law of coarse-grained materials, the single-line method is applied for the wetting deformation test of coarse-grained materials in the earth-rock dam, BP artificial neural network is introduced to optimize and reduced noise for the fitting of wetting deformation data. Based on the results of the indoor test of wetting deformation and neural network numerical analysis, the relationship between the wetting axial deformation, the functional relationship between wetting axial deformation, the wetting volumetric deformation, the wetting stress level, and the test confining pressure were determined, and a new type of wetting deformation analysis model was proposed. The results show that the wetting axial strain and volumetric strain have an exponential and linear relationship with the wetting stress level, respectively, and the fitting parameters in the wetting model also have an exponential and linear relationship with the confining pressure. Finally, by comparing the calculated results of the wetting model with the test results, the rationality of the new wetting model is verified and discussed. While simplifying the parameters of the formula, the model ensures the accuracy of the wetting deformation analysis and provides a reference for the deformation prediction analysis during the operation period of the earth-rock dam.