Test Pile Instrumentation & Monitoring
Test pile is often instrumented with strain gauges for derivation of the pile’s load distribution and unit skin friction. The type of strain gauge is usually vibrating wire embedment type which is particular suitable for pile testing purpose. The strain gauges is output is often wired to a data logger for logging which permits data transfer to PC for post-test processing and analysis.
The advantage of vibrating wire sensors over more conventional types lies mainly in the sensor output, which is a frequency rather than a voltage. Frequencies can be transmitted over long (>2000 m) cables without appreciable degradation of the signal caused by variations in cable resistance, which can arise from water penetration, temperature fluctuations, contact resistance or leakage to ground. This factor, coupled with the ruggedness of strain gauge results in sensors which exhibit excellent long-term stability and which are ideally suited for long-term measurements in adverse environments.
Readings can be transferred to PC for post-test processing and plotting of load-settlement graphs. This enhances the speed of reporting as load settlement readings will no longer required to be fed into the PC manually.