Study on Protective Coal Pillar Size Design for Ultra High Voltage Line Tower Mining in Mountain Areas

摘要

High voltage line towers in mining areas are sensitive to surface deformation caused bymining. Protective coal pillar design for high voltage towers is one of the commonly-used technicalmeasures. Aiming to solve the coal mining safety problem under the Ultra High Voltage transmissionline in Sihe Coal Mine of Shanxi Province, the angle and size of protective coal pillars with the verticalline method were analyzed in this paper. The effect of additional displacement caused by landslideor slippage mining in mountain areas and repeated mining was considered. Based on the principleof the vertical line method, the protective coal pillar range and size were calculated. The amount ofcoal deposited in coal pillars for high voltage line towers was compared and analyzed between thevertical line method and the linear structure method. The results showed that the angle of criticaldeformation decreased by 2~10 ? caused by slippage due to mining in a mountainous area, and theangle in the uphill direction of building decreased more than that in the downhill direction; whenmulti-seams were mined repeatedly, the angle of critical deformation in the lower seam coal miningwas reduced by 5~10 ? compared with that of the upper seam. The protective coal pillar design withthe vertical line method can protect the high voltage line towers more effectively, and the amountof protective coal pillars with the vertical line method was 5.8 million tons less, which avoided thewaste of coal resources.