The work is devoted to effective ways to increase the load capacity of buildings bases and structures by impregnating soils with compounds based on complex finely dispersed binder and local raw materials. The article shows that an important factor in the effective injection fixation of structural-unstable soils is the penetrating ability of the solution characterized by viscosity and sedimentation, depending on the composition of the complex binder. It allows to improve the antifiltration properties of the reinforced massifs, resistance to various aggressive effects, speed of strength gain, etc.