关键词: 高水材料, 聚丙烯纤维, 力学性质, 阻裂效应

Abstract: As a new type of filling material，high-water material has been widely used in backfill mining in recent years.However，the filling material of pure high-water material often occur many crack after compression，resulting in low strength and unstable performance.Polypropylene fiber was used to mix with high-water material.The failure process，compressive strength and deformation characteristics of high-water material doped with polypropylene fiber were tested by ETM mechanical test system.The results showed that the length and content of polypropylene fiber have influence on the strength of high-water material sample.Polypropylene fiber hardly any change the failure form of high-water material and the shape of stress-strain curve，and the destructional forms of the mixed sample is still “X” type shear and splitting failure.The mechanical properties of the high-water material were enhanced by the addition of polypropylene fiber，and the residual strength of the doped fiber sample was 65%~84% of the peak strength.The crack resistance effect of polypropylene fiber makes the high-water material have better integrity and continuity，polypropylene fiber has strong reinforcing effect on high-water material，and it is suitable for supplement of high-water material filling body in goaf.

Key words: High-water material, Polypropylene fiber, Mechanical properties, Crack resistance effect