METHOD FOR COMPACTION OF LOESSIAL SOILS IN BASES OF BUILDINGS AND STRUCTURES Russian patent published in 1994 - IPC

FIELD: construction. SUBSTANCE: injected into loessial slumping soil mass through injectors is loessial pulp with pressure gradually raised up to 3-10 atm. at rate of 3-5 cu.m/h for time needed to form hydrofrac in soil mass. Then, injection rate is reduced at least twice to discontinue further growth of hydrofrac value and wetting of mass zone round fracture. Cement-sand grout is injected at pressure of 3-10 atm. to compact soil in wetted zone up to achieve soil porosity of 38-40%. Loessial pulp contains clay particles in amount of 5-15%. Besides, injection of loessial pulp is carried out in opposite directions, e.g., by means of two-directional slotted injector. EFFECT: higher efficiency of soil compaction. 3 cl, 1 dwg