Spatial-temporal variability of reclamation soil compaction in coal mine region

In order to reveal the spatial-temporal variation law of reclaimed soil compaction in coal mine area, the reclaimed soil compaction variability from vertical and horizontal aspects of five years was analyzed by the testing on the spot and comparing with normal land. The results showed as follows: the reclamation soil surface compaction was the highest with reaching 2050 kPa in first year, and gradually reduced year by year, was the lowest(50 kPa) in the fifth year, and was almost reached the compaction level of unsubsided land. The order spatial variation of soil surface compaction was in the land reclaimed five years(68.40%), next was unsubsided land(52.58%) and the lowest was the land being reclaimed(22.01%); in terms of the variation, the soil compaction is higher and the variation is lower to each soil layer of being reclaimed land, and the compaction of the first three layer is lower but the variation is higher to other redamed land, to the fourth layer(22.86～30.48 cm) is higher and variation is lower, and the compaction under the forth layer is nearly stable.