Foam light soil construction method

The invention discloses a foam light soil construction method, which comprises the following steps: 1, a foundation trench is digged according to a preset elevation, and a soft foundation is reinforced at the bottom of the foundation trench; 2, a plurality of settlement joints in the length direction of the roadbed at intervals are arranged; 3, a subgrade section is arranged between every two adjacent settlement joints, subgrade sections are constructed and poured in a segmented mode in the length direction of the subgrade, each subgrade section is poured in a layered mode in the height direction of the subgrade, wherein each subgrade section comprises: a subbase layer laid on the soft foundation at the bottom of the foundation trench, each subbase layer comprises at least two layers of subbase units, and the two sides of each subbase layer are step-shaped, each bottom base unit comprises an anti-sinking structure, a connecting ball body, a limiting net and a foam light soil layer; a force bearing layer compr