厚松散层矿区采动程度对地表沉降特征的影响
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摘要
为了研究厚松散层矿区采动程度对地表沉降特征的影响,以红岭煤矿1501工作面地表移动观测数据为基础,着重研究厚松散层地质采矿条件下走向采动程度对地表下沉率、主要影响角正切以及拐点偏移距的影响。结果表明,在厚松散层条件下,随着走向采动程度的增加,在由极不充分采动过渡到非充分采动时,地表下沉率由0.03增加到0.10,扩大近3倍,之后随着走向采动程度的继续增加,地表下沉率变化平缓;随着走向采动程度的增加,走向主要影响角正切减小速度要明显快于倾向主要影响角正切,并且依据红岭煤矿地质采矿条件,分别拟合出了走向采动程度与地表下沉率和主要影响角正切的经验公式。
In order to study the influence of mining degree on surface subsidence characteristics under the geological and mining conditions in thick unconsolidated layers, basing the surface movement observation data of 1501 working face of Hongling Coal Mine area, the influence of mining degree on the surface subsidence rate, the tangent of main affecting angle and movement distance of inflection point was analyzed. It was concluded that under the condition of thick loose bed, with the increase of mining degree, surface subsidence rate increases from 0.03 to 0.10, increasing nearly 3 times when the trend mining is shifting from very full mining to not a sufficient mining, and later, with the still increase of mining degree, the surface subsidence rate increases slowly; with the increase of mining degree, the tangent of main affecting angle about the trend decreases more quickly than the tangent of main affecting angle about the inclination direction, and according the geological and mining conditions of Hongling Coal Mine, the experience formula between the mining degree of trend and the surface subsidence rate and the tangent of main affecting angle was fitted out respectively.
In order to study the influence of mining degree on surface subsidence characteristics under the geological and mining conditions in thick unconsolidated layers, basing the surface movement observation data of 1501 working face of Hongling Coal Mine area, the influence of mining degree on the surface subsidence rate, the tangent of main affecting angle and movement distance of inflection point was analyzed. It was concluded that under the condition of thick loose bed, with the increase of mining degree, surface subsidence rate increases from 0.03 to 0.10, increasing nearly 3 times when the trend mining is shifting from very full mining to not a sufficient mining, and later, with the still increase of mining degree, the surface subsidence rate increases slowly; with the increase of mining degree, the tangent of main affecting angle about the trend decreases more quickly than the tangent of main affecting angle about the inclination direction, and according the geological and mining conditions of Hongling Coal Mine, the experience formula between the mining degree of trend and the surface subsidence rate and the tangent of main affecting angle was fitted out respectively.
引文
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