Abstract:The composite condensate expansion materials is a new type of mine filling material. The effects of the admixture dosage on the compressive strength, non-solid phase volume ratio, expansion ratio and strength loss rate of the multiphase condensate expansion filling materials were studied by single factor test and random test method. Based on a large number of test data obtained by random test method, the effect of material properties under multi-factor combined action was studied by 3D visual model analysis. Polynomial approximation method was used to establish a multivariate nonlinear regression model corresponding to different types of filling performance. The results showed that with the increase of SAP content, the compressive strength and water resistance of the filling body decreased gradually. With the increase of GPA content, the strength of the filling body decreased gradually, the expansion rate of the filling slurry increased significantly, and the water resistance of the filling body decreased gradually. The content of GPA has the greatest influence on the 3 d compressive strength; the volume fraction of non-solid phase is mainly affected by the content of SAP, and the expansion rate of multi-phase condensate expansion material is mainly affected by the content of GPA. The strength loss rate is mainly affected by HA content.