Freezing-based large-dip-angle stratum advanced pre-grouting anti-slurry-leakage method

The invention discloses a freezing-based large-dip-angle stratum advanced pre-grouting anti-slurry-leakage method, which adopts a drilling water injection freezing process, and implements freezing at a reasonable position of an injected stratum according to a dip angle of a stratum and a spatial form and position of a targeted area of the injected stratum to form a frozen anti-slurry-leakage curtain body so as to prevent slurry from overflowing from the ground or overflowing to an invalid space of the stratum. The flowability of the slurry is not changed, and the slurry fully fills stratum fractures in a targeted area. According to the grout leakage prevention method, the grout is actively prevented from overflowing out of the ground along the large-dip-angle stratum fracture or overflowing to the invalid space in the distance through the freezing curtain, the grout diffusion direction and distance are effectively controlled, the invalid migration amount of the grout is reduced, and the anti-permeability of t