Numerical Simulation of Fluid-Solid Coupling in Surrounding Rock for River Stope Mining

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.

Progressive Evolution Model of Fault Water Inrush Caused by Underground Excavation Based on Multiphysical Fields

“…In this section, we present cloud maps of pressure and velocity under different conditions, as shown in Figures 17-23. 20 Geofluids…”

“…The behavior of mining of coal seams in the stope and the fault fracture zone interact with each other. The mining stress represented by the abutment pressure is the main inducement for the formation of the water-conducting fracture zone due to the floor failure and the "activation" of the fault water inrush [20,21]. At the same time, due to the influence of fracture, the stress distribution of surrounding rock in the stope and fracture area is more intensive, thus increasing the risk of floor instability [22].…”

Joint Investigation and 3D Visual Evaluation of Rock Mass Quality

“…Combining the acquired RMR values with the photo field locations in Table 1 yields a set of (x, y, z, RMR) data sets that will be used as sample points for block model assignment. Firstly, a solid model of the cube containing the estimated area was established to observe the rock mass distribution near the level of − 540 m more intuitively [51][52][53][54][55]. e z direction of the cube was − 560∼− 450 m, and the x and y directions were 529500∼532099 m and 3431599∼3433849 m, respectively; Secondly, the solid model is converted into a block model.…”

The Damage Induced by Blasting Excavation and Seepage Characteristics of Deep Rock under High Seepage Pressure

“…Yang et al [14] conducted three-dimensional fluid-solid coupled model tests to explore the evolution law of water inrush in karst caves which were induced by tunnel excavation and varying water pressure in the caves. Yuan et al [15] simulated the influence of mining disturbance in mines on the faults and rivers in the surrounding area based on the rock fluid-solid coupled theory. The results showed that mining activities can cause further damage to faults and rock bridges, causing increased rock permeability, which may allow mining filed to form a coalesced seepage channel spanning from a river to faults.…”