5th International Conference on Environmental Science and Civil Engineering | |
Instability Criterion for Surrounding Rock of Water-Rich Roadway in Sandy-Gravel Stratum Based on Catastrophe Theory | |
生态环境科学;土木建筑工程 | |
Yuan, Yue^1^2 ; Fu, Jinlei^3 ; Qin, Jian^3 ; Wang, Xiaokang^3 ; Wang, Bensheng^3 | |
Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Xiangtan | |
411201, China^1 | |
Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Xiangtan | |
411201, China^2 | |
School of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan | |
411201, China^3 | |
关键词: Cusp catastrophe model; Damaged zones; Deformation and damages; Displacement function; Instability criterion; Irregular fluctuations; Roadway surrounding rock; Sandy gravel; | |
Others : https://iopscience.iop.org/article/10.1088/1755-1315/283/1/012030/pdf DOI : 10.1088/1755-1315/283/1/012030 |
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来源: IOP | |
【 摘 要 】
In order to solve the problem of instability discrimination for water-rich roadway in sandy-gravel stratum, taking the displacement function and damaged area function as potential functions of the roadway surrounding rock system based on catastrophe theory, the instability criterions of the roadway in sandy-gravel stratum under seepage were established, i.e. the criterion for extremal modulus of displacement and criterion for the damaged area. Then the specific process for stability discrimination was further proposed. A PFC2D numerical model for a shaft bottom roadway in a large coal mine in Xinjiang was established. The calculation results show that as seepage pressure increases, modulus of displacement and damaged area in surrounding rock present irregular fluctuations and similar change rule. In the latter stage of the increase of seepage pressure, the deformation and damage of the roadway all have experienced a sharp sudden raise. And the conclusion of instability discrimination obtained from the calculation results of catastrophic eigenvalues for modulus of displacement and damaged area are consistent with damage evolution and instability process of the surrounding rock, which verifies the feasibility and applicability of the instability criterions.
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Instability Criterion for Surrounding Rock of Water-Rich Roadway in Sandy-Gravel Stratum Based on Catastrophe Theory | 1328KB | download |