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| The overbroken rock mass of gob area is made up of broken and accumulated rock blocks compressed to some extent by the above strata. The bearing pressure of gob can directly affect the safety of mining field, formation of road retained along next goaf, and seepage of air and methane of gob. In this paper, the software RFPA’2000 is used to construct numerical models, and especially the Euler method of control volume is put forward to solve the simulation difficulty come from plastically finite deformation. The results show that three characteristic regions occurred in gob area: (1) Naturally accumulated region, 0~10m far from unbroken surrounding rock walls, the bearing pressure nearly being zero; (2) Overcompacted region, 10~20m far from unbroken walls, the bearing pressure resulting in the maximum value; (3) Stable compaction region, more than 20m far from unbroken walls and occupying absolute majority of gob area, the bearing pressures basically having no difference there. |
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| Keywords:gob area; overbroken rock mass; finite plastic deformation; Eular method of control volume; bearing pressure |
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