基于等价采高模型的膏体充填开采沉陷预计

为了对膏体充填开采后地表沉陷规律进行研究,根据膏体充填开采的现场实践及充填材料的组成情况,建立了适合于膏体充填开采的等价采高模型.模型中等价采高由充填前顶底板移近量、充填欠接顶量、膏体充填体的收缩量及压缩量组成,计算公式中含有泌水率、膏体充填体的压缩率等参数.将建立的等价采高模型与概率积分法结合,对许厂煤矿130采区北翼保护煤柱采用膏体充填开采后产生的沉陷进行预计,结果表明膏体充填开采后地表产生的移动及变形较小,可以保证矿用铁路及附近建筑物用地安全使用.

Subsidence prediction induced by the paste backfill mining based on the equivalent mining height model

In this paper, in order to study the ground subsidence induced by the paste backfill mining, according to the field practice of the paste backfill mining and composing status, the authors established an equivalent mining height model which is fit for the paste backfill mining. This model was composed of roof-to-floor convergence before backfill, the gap between the backfill body and the roof, the shrinkage of the backfill body and the amount of backfill body compression. The calculating formula contained parameters such as the bleeding rate, the compression ratio and so on. The authors predicted the subsidence which might happen when the coal was mined by the paste backfill mining method in the 130 mining area of Xuchang coal mine protective coal pillar. The results showed that the ground moved and subsided little after the paste backfill mining which guaranteed that the mining railways and surrounding buildings can be effectively used.