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2 Journal of Theoretical and Applied Mechanics

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Study on characteristics of three-dimensional granular meso-reconstruction of coal gangue roadbed

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Fan X.-X. , Hui B. , Ma S.-J. , Fu J.-C. , Zhang W.-J. , Meng L.-X. , Sun Z.

Journal of Theoretical and Applied Mechanics

2022

tom Vol. 60 nr 3

361--374

The dynamic evolution process of the coal gangue particles’ core retention phenomenon in the process of crushing under stress, the evolution law of grading and the corresponding microscopic mechanical characteristics after continuous particle crushing are analyzed. The meso-level which reveals deformation phenomena of granular materials under the action of external loads is highly complex. At the qualitative level, the static compaction process of coal gangue samples can be roughly divided into three stages: initial compaction stage, compaction and crushing stage, and crushing (compaction) stage. It is proved that the interaction of lateral confined unidirectional compression of granular materials is mainly compression.

Study on stress characteristics of high-porosity coal gangue subgrade during filling process

100%

Hui B. , Hui Y. , Zhang X. , Zhang W. , Yan S. , Men G.

Journal of Theoretical and Applied Mechanics

2023

tom Vol. 61 nr 3

625--641

By analyzing geological conditions of a coal gangue filling roadbed, stress characteristics and settlement changes during the filling process of the coal gangue roadbed are simulated. The following conclusions are drawn: (1) As height of the coal gangue filling increases, the stress and settlement of each part will also increase. (2) During the filling process, the vertical stress acts as the first principal stress, and the stress and strain at the centerline of the roadbed are 10 times that of the roadbed. (3) The final stable value of uneven settlement of the coal gangue roadbed is 18.85mm. (4) The monitoring results indicate that the settlement of the coal gangue roadbed is stable, and the settlement amount is small ensuring safety of the roadbed.