METHOD OF ESTIMATING ORIGIN POSITION GEL TIME OF GROUND INJECTION CHEMICAL

摘要

PROBLEM TO BE SOLVED: To estimate the origin position gel time of a chemical injected into a ground for countermeasure against the liquefaction of the ground so that the chemical can be reliably injected into the ground within the range to be injected before gelation when the chemical is injected into the ground. SOLUTION: An oscillator sensor unit capable of transmitting and receiving a compressional wave (P wave) and a shear wave (S wave) is installed in the ground improved by injecting the chemical therein. The gel time at the origin position of the injected chemical is estimated from the changes over time of the compressional wave velocity (Vp) among the elastic waves measured and calculated by the oscillator sensor, and the chemical is injected reliably into the ground to be injected before the start of the gelation. COPYRIGHT: (C)2010,JPO&INPIT