Modified sepiolite fiber toughened composite grouting material as well as preparation method and application thereof

The invention provides a modified sepiolite fiber toughened composite grouting material as well as a preparation method and application thereof. The toughened composite grouting material is prepared from the following components in parts by weight: 200 parts of cement, 10 to 50 parts of modified sepiolite fiber, 5 to 15 parts of early strength agent, 1 to 5 parts of surfactant, 1 to 5 parts of silane coupling agent, 5 to 10 parts of sodium silicate and 200 to 400 parts of water, wherein the modified sepiolite fiber is modified by acid. According to the invention, the modified sepiolite fiber is added to overcome the defects of poor early-stage anti-scouring performance, poor volume stability, poor stone toughness and the like of the traditional Portland cement single slurry, so that the grouting material has the effect which can be achieved by adding clay minerals and reinforced fibers in the existing grouting material synthesis technology; the method has the advantages of controllable gelation time, moderate