Abstract
Mining disturbance will induce further weakening of faults and rock bridges, improve rock mass permeability and, in serious cases, conduct surface rivers to cause disasters. A numerical calculation model of river-fault in the mining area is established. Based on the fluid-solid coupling theory of rock mass, the influence of mining disturbance on the development and evolution process of rock bridge rupture and river-fault-stope potential seepage channel is simulated and calculated. Research studies show that under the disturbance of ore body mining, it is possible to form a channel from the river to fault to seepage and drainage in the stope. The disturbance of ore body mining has no great adverse effect on the stability of the rock mass at the top of F2 fault. The rock mass damage caused by mining is only distributed in local areas, and the rock bridge between the river, fault, and stope is not completely connected. The fracture of mining rock mass leads to the increase in permeability of rock mass, and seepage tends to spread in the direction of the fault, but there is no obvious through drainage channel from surface water to the stope. The results of research provide technical guidance for the mine to use the filling mining method after the river does not change the road safety and reliability certification and can also provide reference for similar mines.
Highlights
Under the actions of tectonic movement, weathering, erosion, etc, a natural geological body develops a large number of fissures or even faults with different directions and sizes which are cutting each other. e existence of these joints and faults provides necessary channels for the infiltration and flow of surface water and groundwater
When the rock bridge between the fault and the stope is seriously damaged, it results in the development of fractures through and affects the underground aquifer or surface water, and the water will flow into the stope, causing water inrush and mud inrush disasters [1,2,3,4,5]
Based on the above simulation scheme, this paper focuses on the damage effect of the rock bridge in mining and the seepage characteristics of the rock mass at different times when the rock bridge is destroyed the most seriously
Summary
Under the actions of tectonic movement, weathering, erosion, etc, a natural geological body develops a large number of fissures or even faults with different directions and sizes which are cutting each other. e existence of these joints and faults provides necessary channels for the infiltration and flow of surface water and groundwater. Ere are few reports on the fracture mechanism, damage effect, and seepage channel formation of the stope-fault rock bridge under complex conditions of fault influence and mining disturbance. Based on the engineering background of the influence of the Xima River on the seepage of the filling mining method in the Makeng Iron Mine, this paper establishes a fluid-solid coupling numerical analysis model of ore body mining based on FLAC3D, studies the damage effect of the fault-stope-rock bridge and the dynamic response of the seepage channel after mining disturbance, demonstrates the safety and reliability of the river (Xima River) in the mining area without diversion, and provides reference for similar mining projects. Based on the engineering background of the influence of the Xima River on the seepage of the filling mining method in the Makeng Iron Mine, this paper establishes a fluid-solid coupling numerical analysis model of ore body mining based on FLAC3D, studies the damage effect of the fault-stope-rock bridge and the dynamic response of the seepage channel after mining disturbance, demonstrates the safety and reliability of the river (Xima River) in the mining area without diversion, and provides reference for similar mining projects. e method described in this article relies on the actual situation of the project to dynamically and iteratively calculate the seepage parameters and deformation data. e cloud image of the parameters related to the rock bridge breaks intuitively reflecting the disruptive effects of mining disturbances and provides theoretical support for the safety assessment of mining activities under rivers
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