| 摘要 |
A sensor unit is disclosed for use in monitoring in situ changes in dynamic and static stress properties of any material to be monitored, such as monolithic concrete or underground rock structures. The sensor unit includes a hollow, water-proof tubular body (20) to be inserted into a cylindrical borehole (8) in the material to be monitored. A transducer (44) is mounted within the body (20), which by means of strain gauges (49), provides an output signal responsive to deflection of the sidewall of the borehole (8). The transducer (44) is coupled to the sidewall by means of pressure buttons (56). A monitor is also disclosed, which comprises the sensor unit (2), a data collection unit (130) and a data analysing unit (132). A method for sensing dynamic and static changes in material stresses is also disclosed. |
