Abstract
In this work, a numerical study is conducted on the seismic response of deep-buried roadways in coal mines under the influence of goafs, and a 3D numerical model of the seismic response simulation of deep-buried roadways is established using the coupling model of the finite difference method and the distinct element method. This model simulates the seismic response of different coal pillar widths and the seismic conditions of the deep-buried roadways under the influence of the adjacent goafs. The deformation, stress distribution, and plastic area distribution of roadways and coal pillars are systematically studied, and the situations under the static load and the roadways, which are not affected by the goafs, are compared and analyzed. A reasonable width of the coal pillar is proposed on the basis of the stability of the roadway and the coal pillars. In the end, suggestions for the reasonable setting of coal pillars under seismic load are provided.
Highlights
finite difference method (FDM) parameters are obtained from coal mine strata. e distinct element method (DEM) refers to the data in literature [44]
E 7435 working face of the Kongzhuang Coal Mine has an elevation of −1017.50 m to −883.80 m. is study ignores the effects of the stratigraphic dip. e working face is arranged horizontally. e working face and the roadway are arranged at 1000 m. e rock mass density and the upper vertical stress are valued at 2500 kg/m3 and 25 modulus (GPa) Density (kg/m3) Cohesion (MPa), respectively, and the horizontal stress ratio is 1.5 during the static calculation of the model. e front, rear left, right, and the bottom are fixed at the model static calculation boundary conditions. e dynamic boundary condition of the model is the free-field boundary condition to reduce the reflection of waves
The horizontal displacement deformations of coal pillars and roadways in adjacent goafs under the influence of frequent or continuous dynamic loads differ, and the width of the coal pillars remarkably affects the changes in displacement
Summary
E coal seam thickness of the working face is 4.20 m∼5.10 m, and the average thickness is 4.60 m. E numerical model is established on the basis of the tail entry of the 7435 working face of the Kongzhuang Coal Mine. E rock mass density and the upper vertical stress are valued at 2500 kg/m3 and 25 MPa, respectively, and the horizontal stress ratio is 1.5 during the static calculation of the model. E anchor cables are arranged in the middle of the bolts near the middle point of the bolster and the roof of the roadway with anchor cable diameter, length, yield load, and pretightening force of 17.8 mm, 8.2, 600 kN, and 150 kN, respectively. Considering the effect of the model size, the acceleration of the seismic wave in the y direction is set to 0 due to the small size of the y direction, and the acceleration in the x and z directions is entered in accordance with the original size
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