Fly ash modified double-liquid grouting material

The invention relates to the field of grouting, and particularly discloses a fly ash modified double-liquid grouting material. The fly ash modified double-liquid grouting material comprises a group A material, a group B material and disodium hydrogen phosphate, the material group A comprises cement, fly ash and water, the weight part of the fly ash is 0-60, and the weight determination of the cement, the fly ash and the water comprises the following steps: step 1, calculating the weight ratio of the water to the cement according to the formula: the water-binder ratio = the weight of the water/(the weight of the cement + the weight of the fly ash), and the water-binder ratio of the material group A is 0.6-0.8; 2, when the weight part of the fly ash is larger than 0, the mixing amount of the fly ash accounts for 45-55% of the total weight of the fly ash and the cement; the material group B comprises water glass, and the baume degree of the water glass in the prepared fly ash modified double-liquid grouting mate