Abstract：According to the test results of grouting to mitigate subsidence，the variation law of grouting pressure during grouting is analyzed，including stage of pressure quickly reducing，the pressure burdening stage and the stage of pressure gradually increasing. The function relationship between grouting pressure，developing velocity of separation layers and grouting volume is discussed. The emphasis of this paper is the research on the effect factors of grouting，and the relationship between the surface subsidence reduction ratio and grouting volume，layout of pressed wet fine coal ashes in bed-separations，mining depth，excavation face width，overburden rocks characteristics，structure and so on. Based on the analysis of dynamic law of overburden bed-separations，the technological approach to improve the effect of grouting is discussed，including adopting the continuous grouting in multi-separation layers，optimizing excavation face design and increasing grouting volume in the pressure burdening stage.
5Gan Yanfa，Zhang QingSong. Study on theory and technology of mining subsidence control by filling fine-coal ash grouting in overlying separated strata[A]. In：21st International Conference on Ground Control in Mining[C]. [s. l.]：[s. n.]，2002，369～373
2004, Vol. 23 
