Dual-fluid grouting material for sand and gravel stratum and application method thereof

The invention discloses a dual-fluid grouting material for a sand and gravel stratum, which comprises a fluid I and a fluid II, wherein the fluid I comprises the following components in parts by weight: 40-60 parts of water, 40-60 parts of cement and 0.2-1.5 parts of sodium-polycarboxylate dispersing agent; and the fluid II comprises the following components in parts by weight: 40-60 parts of water and 40-60 parts of water glass. The invention also discloses an application method of the dual-fluid grouting material for a sand and gravel stratum. Since the sodium-polycarboxylate dispersing agent can be adsorbed to the solid particle surface, the condensed solid particle surface can be easily wetted, thereby preparing the grout for a sand and gravel stratum. Compared with the traditional cement-water glass grout, the grout disclosed by the invention has higher flowability, uniformity and injectability, so that the dual-fluid grout has wide injection range and more uniform dispersion in the sand and gravel stratum.