| 摘要 |
PROBLEM TO BE SOLVED: To provide such a ground evaluation method that an N value of ground can be accurately estimated even when a simple drilling machine is used.SOLUTION: In a ground evaluation method, a measured value obtained during drilling is used. The ground evaluation method includes a step (step S3) of measuring a penetration speed and a feeding force acting on a rod penetrating ground by a vibro-drill 1, and a step (step S4) of estimating an N value of the ground by an estimated equation in which measured values of the feeding force and the penetration speed, measured in the step, are used as variables. |
