Abstract
Rock fracture zones were distributed in a metal mine, and their deformation was always neglected because they are available on a small scale. However, the deformation of the small-scale fracture zone may lead to serious consequences, such as underground building and structure failure. Combined with the ground movement and surface fissure monitoring, the deformation of several fracture zones was analyzed by field monitoring, experimental test, and numerical simulation. The results showed that fracture deformation promoted the surface fissure movement. The horizontal movement of the foot wall rock of the fracture was found to be larger than the hanging wall rock. Deep mining engineering resulted in the squeezing of the shallow fracture, and the shallow fracture deformed more severely than the deep fracture. In the study area, fracture zone displacements were estimated according to a numerical model. The deformation and stress comparison of the shallow fracture zone and the deep fracture zone provided the characteristic of the broken structure in the field investigation.
Highlights
After nearly two decades of monitoring work, the subsidence center was found that was located in the hanging wall rock mass. e displacements of the hanging wall rock mass were found to be larger than the foot wall rock. e foot wall rock was observed to be basically stable
Experimental Test of Soft Material e simulation test of soft material was used to analyze the mechanism of rock fracture zone deformation influenced by mining engineering. e soft material test was applied in studying different issues, such as landslide deformation, open-pit slope tumbled, and rock mass movement in the mining area [20,21,22,23,24]. e advantage of the soft material
Numerical Simulation Model Parameters. e simulation model was developed by the finite element method for analyzing the deformation of small-scale rock fracture zones located in the foot wall rock mass
Summary
After nearly two decades of monitoring work, the subsidence center was found that was located in the hanging wall rock mass. The ventilating shaft located in the foot wall area was damaged. In this profile, more than five fracture zones were investigated, and the ventilating shaft went through these zones. E subsidence center is 340 m away from the ventilation shaft on exploration line-14 and 130 m away from the projection of the ore body on the surface. E subsidence center was found on the hanging wall rock mass, which was located in exploration line-14 (point 1408 and point 1409). E major reason of ground subsidence and overlying rock mass movement is large-scale stress adjustment, and redistribution resulted in the elasticplastic deformation of the surrounding rocks and squeezing of the filling body Only a subsidence center was determined on the ground. e rock mass of exploration line-14 moved strongly. e major reason of ground subsidence and overlying rock mass movement is large-scale stress adjustment, and redistribution resulted in the elasticplastic deformation of the surrounding rocks and squeezing of the filling body
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