Compression-springback property is a important reference on the foundation treatment and foundation pit engineering in the analysis of subsidence and deformation of backfill.As the sandstone particles material is a granular material,the prophase load and dry density influences its compression-springback characteristic on the condition of soaking;using the stress control trigeminy(high pressure)consolidation apparatus,the compression-springback characteristic is explored under the prophase load or the dry density after soaking 24 h.The results show that,at the same dry density,with the increase of prophase load,the compression properties of the sandstone particles material decrease gradually;under the condition of same unloading ratio,springback rate gradually decreased.At the same prophase load,with the increase of dry density,the compression-springback properties of the sandstone particles material decrease gradually.With the increase of prophase load and dry density,the plastic strain of the sandstone particles material decreases gradually.