Limitation of Low Strain Reflected Wave Method to Test of Extra-long PHC Piles in Large-diameter

Based on overseas engineering experiences of applying low strain reflected wave method to the detection of extra long PHC piles in large diameter,in comparison with aperture imaging method and high strain dynamic test method,it is suggested to combine low strain reflected wave method with the above two kinds of detecting techniques in order to determine the integrity of PHC piles precisely due to the limitation of applying low strain reflected wave method to the detection of extra-long PHC piles in large-diameter.