High-permeability spongy soil as well as preparation method and application thereof

The invention discloses high-permeability spongy soil as well as a preparation method and application thereof. The method comprises the steps that engineering muck, plant fallen leaves and fiber materials are mixed and stirred, and mixed soil is obtained; the mixed soil is subjected to granulation treatment, a curing agent solution is added in the granulation treatment process, and granular spongy soil with the particle size ranging from 10 mm to 50 mm is obtained through control. According to the method, a curing agent is added in the granulation treatment process, and the main purpose of the curing agent is to maintain the cohesiveness and stability of soil particles. Compared with soil particles granulated in a pure distilled water environment, the soil particles can keep completeness for a longer time by doping the curing agent (such as carboxymethyl cellulose) solution, so that the spongy soil integrally keeps permeability equivalent to that in an initial state for a long time. In addition, the method ha