A method for injecting expanding resins into soils to be consolidated, which comprises the steps of: - drilling the soil to be consolidated in order to provide at least one hole; - estimating the rupture pressure of the soil, also known as the cleavage pressure, at the regions affected by said hole; - providing a system for injecting said expanding resins into said soils to be consolidated, which comprises a pump apparatus which is operationally associated, at a delivery port, with a tubular element having, at its lateral surface, a plurality of holes which are mutually spaced apart along the direction of longitudinal extension of said tubular element, wherein at least two of said plurality of holes comprise respective calibrated holes (21a, 21b, 21c, etc.) which have an outlet, said pump apparatus being adapted to supply intermittently said expanding resin toward said delivery port, - calculating a rupture pressure of the soil, also known as the cleavage pressure, at each one of said calibrated holes (21a, 21b, 21c, etc.), - inserting, into said at least one hole, said tubular element, - supplying intermittently, by way of said pump apparatus at said preset supply pressure, said expanding resin toward said delivery port; - providing the dimensions of the outlets of said calibrated holes (21a, 21b, 21c, etc.) and the preset supply pressure of the resin to said tubular element so as to provide the outflow of the material through the respective outlets at a pressure that is higher than said cleavage pressure, and so as to provide a substantially identical flow-rate of material passing through each one of said at least two calibrated holes (21a, 21b, 21c, etc.). - drilling the soil to be consolidated in order to provide at least one hole; - estimating the rupture pressure of the soil, also known as the cleavage pressure, at the regions affected by said hole; - providing a system for injecting said expanding resins into said soils to be consolidated, which comprises a pump apparatus which is operationally associated, at a delivery port, with a tubular element having, at its lateral surface, a plurality of holes which are mutually spaced apart along the direction of longitudinal extension of said tubular element, wherein at least two of said plurality of holes comprise respective calibrated holes (21a, 21b, 21c, etc.) which have an outlet, said pump apparatus being adapted to supply intermittently said expanding resin toward said delivery port, - calculating a rupture pressure of the soil, also known as the cleavage pressure, at each one of said calibrated holes (21a, 21b, 21c, etc.), - inserting, into said at least one hole, said tubular element, - supplying intermittently, by way of said pump apparatus at said preset supply pressure, said expanding resin toward said delivery port; - providing the dimensions of the outlets of said calibrated holes (21a, 21b, 21c, etc.) and the preset supply pressure of the resin to said tubular element so as to provide the outflow of the material through the respective outlets at a pressure that is higher than said cleavage pressure, and so as to provide a substantially identical flow-rate of material passing through each one of said at least two calibrated holes (21a, 21b, 21c, etc.).