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Author: Admin | 2025-04-28
The feasibility of remining strip coal pillars, filling remining test was carried out on 16E104, 16E106, and 16E108 working faces. There are no buildings on the ground in this area. Surface subsidence was observed after backfilling to provide basis for the filling and remining of the other areas. The coal seam mined in the test working face is Coal 16, which has an average thickness of 1 m and a dip angle of 5°–10°. Its occurrence is stable or relatively stable, and its thickness variation is insignificant. The coal bed texture is simple and is a comparatively regular coal seam. The average vertical depth of mining is 120 m. The roof is limestone with a thickness of 5.3 m and the floor is mudstone with a thickness of 4.3 m. The length of the working face is 80 m. The original strip mining scheme of the working face was to mine at a 10 m interval in width, leaving pillars with equal width. Therefore, there are a large number of 10-m wide coal pillars left. Figure 3 shows the layout of the working face and the histogram of the rock stratum. FIGURE 3. Panel layout of the study site and coal strata distribution and geological description, (A) Panel layout of the study site, (B) Coal strata distribution and geological description.3 Filling mechanism, process, and related equipment3.1 Analysis of filling mechanismAs strip mining (mining at a 10-m-wide interval) was applied before the 16E104, 16E106, and 16E108 working faces were filled, the direct roof above the working face showed a wavy flexual subsidence as a result of the load from the overlying strata while the overlying strata showed flexual subsidence as a result of its own weight (Deng et al., 2016; Zhou N. et al., 2019). As it was quite a long
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