Patent ID: 6511262
Filing Date: 2003-01-28
Classification: E02D,Y10S

Abstract:
A method for strengthening a weak stratum using a solidified composition comprising the steps of:forming a horizontal drainage layer on the weak stratum; building-up mound structures on the drainage layer-formed weak stratum to a critical mound height; vertically forming holes in said weak stratum; and mixing a first mixture comprising 25 to 35 parts by weight of cement, and on the basis of 100 parts by weight of the cement, 0.2 to 0.4 parts by weight of high fluid adjustment and on the basis of 100 parts by weight of the cement, 0.1 to 0.2 parts by weight of gel retardant, with a second mixture composed of 65 to 75 parts by weight of dried sand having a particle size of 0.074 to 5.0 mm, and on the basis of 100 parts by weight of the cement, 0.3 to 0.8 parts by weight of aluminum powder, then introducing the first and second mixture into the holes.