Abstract
High voltage line towers in mining areas are sensitive to surface deformation caused by mining. Protective coal pillar design for high voltage towers is one of the commonly-used technical measures. Aiming to solve the coal mining safety problem under the Ultra High Voltage transmission line in Sihe Coal Mine of Shanxi Province, the angle and size of protective coal pillars with the vertical line method were analyzed in this paper. The effect of additional displacement caused by landslide or slippage mining in mountain areas and repeated mining was considered. Based on the principle of the vertical line method, the protective coal pillar range and size were calculated. The amount of coal deposited in coal pillars for high voltage line towers was compared and analyzed between the vertical line method and the linear structure method. The results showed that the angle of critical deformation decreased by 2~10° caused by slippage due to mining in a mountainous area, and the angle in the uphill direction of building decreased more than that in the downhill direction; when multi-seams were mined repeatedly, the angle of critical deformation in the lower seam coal mining was reduced by 5~10° compared with that of the upper seam. The protective coal pillar design with the vertical line method can protect the high voltage line towers more effectively, and the amount of protective coal pillars with the vertical line method was 5.8 million tons less, which avoided the waste of coal resources.
Highlights
Based on a case study under the Ultra High Voltage line towers in mining-affected areas, this paper analyzed the angle of critical deformation of strata parameters under different mining effects in this mine and the protective coal pillars for Ultra High Voltage line towers with different methods
The protective coal pillar range design with the vertical line method was a quadrilateral corresponding to each Ultra High Voltage (UHV) line tower respectively
The protective coal pillar design with the vertical line method can realize the coexistence of economic benefits and safety of the UHV line tower
Summary
As the main infrastructure for digesting coal resources and long-distance power transmission in mining areas, the high voltage transmission line towers will inevitably pass through coal mining areas, resulting in a large amount of coal resources being pressed and unable to be exploited [1,2,3]. Bruhn et al [14] studied the influence of surface movement and deformation on high-voltage towers with steel structures. Analyzed and calculated the displacement deformation and additional stress of the high-voltage transmission tower under mining influence combined theoretical model with field measurement. It concluded that the resistance of the high-voltage transmission tower to surface deformation was greater than that of the general building (structure). Based on a case study under the Ultra High Voltage line towers in mining-affected areas, this paper analyzed the angle of critical deformation of strata parameters under different mining effects in this mine and the protective coal pillars for Ultra High Voltage line towers with different methods. It was concluded that the protective coal pillars design for Ultra High Voltage line towers with the vertical line method was more accurate and reasonable to effectively protect the safe operation of the Ultra High Voltage line and the towers on the ground while maximizing coal resources extraction
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