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Author: Admin | 2025-04-28
Combined with the geological data of the 22,410 working faces of the Bulianta Coal Mine, q = 20 MPa, a = 25 m, and the equation (4) are selected and solved with the help of MATLAB. The vertical stress and horizontal stress of the CPs along the floor at different depths under the action of uniformly distributed loads are obtained. The stress and shear stress distribution curves, and the analysis results are as follows: The vertical stress exhibits a single-peak curve distribution at the same floor depth. The peak stress is observed at the centerline of the CP and diminishes as the distance from the centerline increases. The impact range of the CP stress alters with the CP; as the CP floor depth increases, the influence range expands. Within the CP range, the vertical stress decreases with an increase in CP floor depth. Conversely, outside the CP, the vertical stress increases with an increase in CP floor depth, as shown in Figure 12.As the floor depth increases, the distribution curve of horizontal stress transitions from a single-peak configuration in the middle to a two-wing bimodal state, gradually trending toward ease. Within the CP range, an increase in the depth of the CP floor corresponds to a decrease in horizontal stress. Outside the CP, the horizontal stress curve at the same depth generally exhibits an initial increase and subsequent decrease with the distance from the CP boundary line. In the context of mining shallow CSs, the impact of horizontal stress is minimal and can be neglected. Employing the MATLAB software, vertical and horizontal stresses are visualized as shown in Figure 13. It is inferred that the width of the CP remains constant, and the floor is more significantly influenced by the concentrated stress of the CP as the horizontal distance from the center of the CP decreases. Additionally, with an increase in the floor depth, the vertical stress gradually weakens. The shear stress curve of different floor depths has a stress value of 0 at the centerline of the CP; the shear stress curve of the CP at the same depth initially increases and then decreases as the distance from the centerline of the CP increases and gradually tends to relax, eventually it tends to 0. The shear stress peak appears at the two edges of the CP. Because the 2−2 CS is 35 m away from the overlying inclined CP,
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