Advances in Dynamic Foundation Testing Technology

While dynamic pile testing is not new, and is included in many worldwide codes and specifications, dramatic changes from traditional testing methods and common practice have occurred in recent years. Traditionally, the sensors send their signals through a cable to the data acquisition equipment. Experience has shown that some poor data is caused by damage to these cables. New equipment now transmits sensor data from the pile wirelessly to receiving antennas on the data collection equipment. “Wireless” technology eliminates the cables and improves data quality. Sensors which remember their calibration sensitivity and transmit that information eliminate another common problem in data quality, namely having the wrong calibration assigned. Methods of protecting the sensors during installation allow attaching sensors prior to lifting the pile into the hammer leads, and hence speeding up the testing process, and promote safety. The most radical change in the data acquisition process is “remote” dynamic testing, which has revolutionized dynamic testing in some parts of the world. In remote testing, the data acquisition equipment is operated on site by an inspector or the pile crew, and sends the data over the internet to the test engineer in his office. Wireless and remote procedures are described and example experiences indicate the benefits, and areas of caution, of the new technology.