巨厚火成岩下岩层注浆充填效果钻孔探测研究

Study on Grouting and Backfill Effect of Drilling Exploration Under Ultra Thick Igneous Rock

为了检验海孜煤矿巨厚火成岩下岩层和采空区注浆充填效果,评价注浆充填对火成岩的支撑作用,在已实施注浆充填的采区进行了钻孔探测研究。结果表明:采空区至巨厚火成岩底界面存在多个注浆充填层位,充填总厚度达1.67 m,占煤层开采厚度的72.6%;结合地表下沉、煤层采高、充填体厚度等计算得出,注浆充填后地层残余空间高度仅0.10 m,该空间被垮落带碎胀岩体充填,说明覆岩离层和采空区空隙被充填密实,注浆充填对巨厚火成岩起到了支撑作用。

In order to check the grouting and backfill effects in the overburden strata and mining goaf under ultra thick igneous rock in Haizi Mine and to evaluate the support effect of the grouting and backfill to the igneous rock, a study on the borehole drilling exploration was conducted in a mining goaf with grouting and backfill completed. The results showed that there were several grouting and backfill layers existed between the mining goaf and the floor interface of the ultra thick igneous rock, the total thickness of the backfill was 1.67 m and was taken 72,6% of the seam mining thickness, In combination with the calculations on the surface ground subsidence, the mining height of the seam, the thickness of the backfill mass and others, a residual space height in the strata was only 0,10 m after the grouting and backfill completed and the space was backfilled by the broken and swelled rocks in the falling zone, Thus the bed separations of the overburden strata and the voids of the mining goaf were fully backfilled and compacted and the grouting and backfill played a support role to the ultra thick igneous rock.