| 摘要 |
<p>PURPOSE:To enable judgment of characteristic of subsoil by arranging a vibrating machine on a subsoil to be examined while vertical and horizontal vibration sensors at a plurality of points on a straight line far from the vibrating machine to analyze a vibration data obtained by reception. CONSTITUTION:A distance L between a vibrating machine 1 and the center of two pairs of vertical and horizontal vibration sensors 2a and 2b is altered within a range of several meters to several ten meters by determining a waveform of a surface wave determined theoretically of a subsoil to be measured and a waveform close to a rotary axis locus or the like. A distance D between the two pairs of sensors 2a and 2b is set in a range of several meters according to a change in a wavelength of the surface wave to be measured. Then, the vibrating machine 1 having a fixed square is made to cause a vertical vibration by a signal with a frequency generated with a signal generator. The sensors 2a and 2b are operated to receive a vertical component and a horizontal component of vibration of the surface wave at positions A and B respectively. Signals received simultaneously are amplified with a signal amplifier 7 and after converted with an A/D converter 8, it is sent to a CPU 3a for inspection to analyze. After the end of a measurement at one measuring point, the distance between the vibrating machine 1 and the sensors 2a and 2b is altered to perform a measurement at another point.</p> |
