| 摘要 |
PURPOSE:To perform a test without disturbing an in-situ ground, by a method wherein a large pipe having an open lower end is pentrated into an in-situ ground, the pipe is excited, and a change produced in a ground within the pipe is investigated by means of the vibration. CONSTITUTION:A steel pipe 1 is pressed in a ground 2, and after the central part of an internal ground 2a of the steel pipe 1 is bored, meters 6, such as gap water pressure gauge, accelerometer, are buried. A vibro hammer is installed to the upper end of the steel pipe 1, the ground 2a is liquefied through excitation of the steel pipe 1, and a water pressure and acceleration are measured by the meters 6. In case the ground 2a is difficult to be liquefied, a ground around the steel pipe 1 is excavated with a jet of water, and a hole 4 is formed to reduce production of friction. |
