High-frequency seismic probing method for rock quality and load carrying capacity evaluation at the bottom of pile holes

摘要

The high frequency seismic method is employed to explore the water-eroded cave, earth hole and loose agglomerate or interlayer in rock base. Through the theoretical proof based on wave and vibration, the existence and the relative size of the abnormal object can be determined by the abnormal change of phase and periodic in wave figure, by the amplitude attenuation character of the wave train. The compressive wave velocity and self vibration frequency may be measured at the same time. The weathering effect of rock can be decided by the velocity. The carrying capacity of rock can be determined by the velocity and self vibration frequency. The efficiency of method was examined by site load experiment.