METHOD OF IMPROVING CONTAMINATED SOIL WITH HIGH PRESSURE JET

PROBLEM TO BE SOLVED: To safely and positively perform construction by preventing the fall of the soil covered ground onto a cavity before filling a fluidized hardening material or onto an unconsolidated improved part immediately after construction, and to positively replace contaminated soil with improved soil in a method of improving contaminated soil with high pressure jet comprising 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 from a 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. SOLUTION: Ground improvement comprising the boring process, the jet cutting process and the fluidized hardening material placing process is divided in soil improvement of a first stage (B-1) and a process from a second stage (B-2) located below, and soil improvement of the first stage (B-1) is executed as a roof consolidated body, preceding a consolidated body of the second stage (B-2) downward. COPYRIGHT: (C)2004,JPO&NCIPI