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Coal-rock mass exhibits extremely complex and discontinuous deformation, as well as heterogeneous characteristics. Traditional numerical methods, such as the finite element method (FEM), are difficult to accurately describe the entire process of damage accumulation and progressive failure. Based on the non-local peridynamics (PD) method, the corresponding micro-modulus function and critical elongation are derived by reconstructing the kernel function of the constitutive force function. This approach introduces heterogeneity by incorporating random pre-breaking bonds into the homogeneous discrete model. As a result, peridynamics can be applied to the simulation and analysis of deformation and failure of natural heterogeneous materials and structures. Taking the Fucun coal mine as an example, a heterogeneous peridynamics simulation model is established. The deformation and failure laws of the roadway's surrounding rock and failure characteristics of coal pillars with different widths are analyzed. It is found that when the width of the coal pillar is 5 m, the roadway is at the edge of the extrusion deformation zone. The significant change in abutment pressure results in severe deformation and damage to the roadway's surrounding rock. When the width of the coal pillar increases to 6 m and 7 m, the roadway's surrounding rock gradually moves away from the extrusion deformation area. Consequently, the influence of the basic roof rotation movement in the goaf on the coal pillar weakens, resulting in reduced deformation and damage to the roadway. However, when the width of the coal pillar continues to increase, the roadway's surrounding rock enters an area where the stress increases. The high bearing pressure from the external stress field leads to an increase in deformation and damage to the roadway. Considering the deformation and damage characteristics of the roadway's surrounding rock and coal pillar, a reserved width of 7 m for the coal pillar is finally determined. The proposed peridynamics simulation model provides a new and effective simulation tool for optimizing the size of coal pillars in gob-side entry driving.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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