METHOD OF IMPROVING CONTAMINATED SOIL WITH HIGH PRESSURE JET

PROBLEM TO BE SOLVED: To easily and positively prevent sound soil from being contaminated through an excavated hole when lifting cut contaminated soil as slime along the outer periphery of a cutting rod. SOLUTION: This method of improving contaminated soil with high pressure jet comprises a boring process of boring a borehole in the ground to be improved, by a guide of a casing; a jet cutting process of cutting the ground by jetting high pressure jet water into the ground from the cutting rod inserted in the bored borehole, and removing the contaminated soil onto the ground through the periphery of the cutting rod; and a fluidized hardening material placing process of placing a fluidized hardening material in the cut part of the ground. Prior to the boring process, a hole is bored from the ground down to an underground consolidated body forming area 13, and mortar 15 is filled in the bored hole 14. The borehole in the boring process is bored to penetrate the filled part of the mortar 15. COPYRIGHT: (C)2004,JPO&NCIPI