EVALUATION METHOD OF IMPROVEMENT RANGE AND EFFECTIVENESS IN CHEMICAL IMPROVED GROUND AND GROUND IMPROVEMENT METHOD USING IT

摘要

PROBLEM TO BE SOLVED: To provide a method for evaluating the improvement of the ground and a ground improvement method using the method, by accurately grasping the reach of the chemical solution during the construction of the chemical improvement work and efficiently evaluating the effect after the improvement.;SOLUTION: While injecting the chemical injection material mixed with air bubbles into the ground, measure the P-wave velocity VP by means of elastic wave probe, elastic wave logging, acoustic tomography, etc. to determine the reach of the chemical solution and improve the specified range. In addition, the improvement effect is judged based on the relationship between the S-wave velocity VS or P-wave velocity VP and the uniaxial compressive strength, which is obtained by laboratory compounding tests. Furthermore, the S-wave velocity VS or P-wave velocity VP of the sampled sample after the improvement is measured by the bender element test, and the improvement effect is judged based on the relationship between the S-wave velocity VS or P-wave velocity VP and the uniaxial compressive strength obtained by the laboratory compounding test.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2021,JPO&INPIT