| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground improvement method capable of reducing the occurrence of ground displacement, by setting the total injection slurry amount and the total earth removal amount in the same degree, that is, setting the earth removal ratio substantially equal.SOLUTION: When determined that the earth removal ratio 100% cannot be secured by observing the earth removal ratio while executing construction by using ordinary hole-drilling water, in an auxiliary hole-drilling process in an establishment process, the earth removal ratio is set so that the total earth removal amount ΣV per one improvement body is made to substantially coincide with the total injection amount Σq of solidification material slurry by imparting viscosity to removal earth by using the hole-drilling water as viscous hole-drilling water by volumetrically determining-mixing a high concentration thickener liquid in the hole-drilling water in response to an earth removal state from a hole-drilling hole.SELECTED DRAWING: Figure 6 |
