Comparison of propagation characteristics of excited stress waves in pile and anchorage with bolt systems

often confused with each other, possibly resulting in incorrect assessment of the quality of the pile
and the anchorage systems. The stress wave velocity is one of the most important parameters for
evaluating the quality of dynamic tests. In this paper, the stress wave velocities in standard
concrete specimens of the free rock bolt and the different ages were a reference for comparing the
stress wave velocities in a pile-and-anchor system. The tests were conducted using the low strain
reflected wave method. Results indicate that the wave velocity in a pile is larger than that in the
standard samples, and that the wave velocity in an anchorage-with-bolt system is smaller than that
in a free steel bar, but larger than that in a pile and in standard samples. Wave velocities in the pile
and in the standard samples were found to raise as the ages of samples increased. The wave
velocity in the anchorage-with-bolt system initially decreased as specimen age increased, but
increased with increasing specimen age afterward.