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Author: Admin | 2025-04-28
Railway. The influence of the coal line is nearly 10 km long. The Jingshan Railway is in the southwest‒northeast direction, and the railway is located above the center of the second mining area. The second mining area is the main mining area of the Tangshan Coal Mine, and the working face layout of the mining area is shown in Figure 1. The working faces from south to north in the northeastern part of the Tieer mining area are the T2191, T2192, T2193(1), T2193(2), T2194 and T2195 working faces, the strike length of these working faces are 1040 m, 960 m, 935 m, 872 m, 852 m and 854 m, and the inclined length of these working faces are 148 m, 150 m, 130 m, 134 m, 130 m, 125 m. The T2294 and T2291 working faces are in the southeast direction. The strike length of the T2294 working face is 1,195 m, and the inclined length of the working face is 144 m. The strike length of the T2291 working face is 1,062 m, and the inclined length of the working face is 138 m. The T2291 and T2294 working faces are adjacent to each other. The coal seam thickness and roof structure are consistent. The coal seam thickness is 10 m, the average dip angle is 13°, and the average burial depth is 676 m. The main roof is a fine–medium sandstone with a thickness of 8.6 m. The immediate roof is a siltstone with a thickness of 5.3 m, and there is no false roof. FIGURE 1. Working face layout of mining area.The working face layout of mining area is shown in Figure 1. The six working faces on the northeast side of Figure 1 are located near the Jingshan railway line, among which T2193(1) and T2193(2) are located directly below the railway. If multiple working faces, such as T2191-T2,195, are directly mined, due to the close proximity of the working face and the large area of combined mining, compared with single working face mining, the adverse effects on the surface and the railway line are more prominent. Therefore, in the early stage, the T2294 and T2291 working faces were used as the engineering background for experimental mining, and the migration pattern of overburden above the working face and the development and evolutionary processes of separation were studied and analyzed, forming the basis of engineering practice. The objectives
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