| 摘要 |
An apparatus for carrying out impact tests on the ground comprises a weight (15, 16, 17) mounted to a pivoted arm (12) and arranged to swing under gravity about the pivot point (14) of the arm and impact with the ground substantially perpendicular to the latter. The apparatus is for operation by one man, who can raise the arm (12) using a pull-cable to a predetermined height as indicated by a rotary transducer on the pivot shaft (14). An accelerometer is provided in the weight and a measure is made of the peak deceleration on impact and of the time delay to reach the peak from the onset of the detected deceleration, from which measurements an apparent modulus on impact can be calculated for the ground under test. |
