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Author: Admin | 2025-04-27
To show the use method of the correction formula and to compare the accuracy of the discrimination results of the improved and traditional methods, the traditional and improved methods are used to discriminate the position of the overburden separation layer in the 22207 working face (Figure 9) of the Shendong Buertai Coal Mine. The relative accuracy of the two methods is assessed by comparing the predicted locations of separated strata from the two methods with field measurements. FIGURE 9. Site location map: Buertai Coal Mine.4.1 ApplicationThe overlying strata have uneven settlement due to mining damage, and the caving zone, fracture zone, and bending subsidence zone are formed from the bottom up. Caving and fracture zones are commonly referred to as water flowing fractured zones (Figure 10). The degree of rock fragmentation in the caving zone is high; the degree of rock mass fragmentation in the fracture zone is small, forming a certain amount of rock cracks; the fracture distribution in the range of the bending subsidence zone is obviously different from that of the water-conducting fracture zone. It is difficult to accumulate a large amount of groundwater in the separation layer in the range of the water-conducting fracture zone, and the rock and soil structures in the bending subsidence zone are relatively complete. The integrity of the separation layer in this range is better, and it can better accumulate the separation layer water. The separation layer water forms a water-conducting channel through the load and eventually leads to the occurrence of the separation layer water inrush event. Therefore, this paper focuses on the separation space formed above the water-conducting fracture zone. FIGURE 10. Post-mining overburden ‘three zone’ divisions.According to the field operation of the Buertai Coal Mine in the Shendong mining area, the ratio of the height of the water flowing fractured zone to mining height (RFM) is 21, the mining height of the 22,207 working face is 5 m, and the development height of the water flowing fractured zone above the 22,207 working face is 105 m. Table 1 shows that the total thickness of the overburden rock in the 1–12 layers is 107.9 m, indicating that the water-conducting fracture has developed in the 12th layer. Therefore, the calculation of the separation space of 1–12 layers is meaningless. The following only needs to determine the separation position of the 12–20 layers of the overburden rock.4.1.1 The determining process and
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