Rapid and Continuous Detection Method for Soil-compaction Degrees of Fill Foundation Based on Multichannel Transient Rayleigh Wave Detecting

WU Chuanyang

doi:10.15953/j.ctta.2022.243

Abstract：To address the large treatment area and tight construction period of large-scale engineering site filling foundations and to ensure the quality and progress of the project,understanding the foundation-reinforcement treatment quickly and accurately is essential.Additionally,to ensure the safety and stability of projects,large-scale projects often have higher requirements for the uniformity of the foundation-soil reinforcement effect.The quality-evaluation indices of foundation-soil compaction and reinforcement mainly include the foundation-bearing capacity,foundation-soil deformation modulus,and compaction coefficient.Conventional testing methods primarily include in-situ loading tests,in-situ sand filling,and soil-sample testing.These methods are either labor-intensive and time-consuming or harmful to the reinforced foundation-soil mass,preventing rapid and continuous detection of the foundation-soil mass.To perform rapid and continuous detection of the compaction and reinforcement effects of foundation-soil mass,the multichannel transient Rayleigh wave-detection method,considering the time difference phase between channels,was used in this study.Additionally,the method was supplemented by the sampling tests of soil mass at selected points in this study.Consequently,continuous three-dimensional imaging of the elastic wave velocity of the foundation-soil mass was obtained,along with the horizontal slice of the Rayleigh wave phase velocity imaging and the horizontal-distribution imaging of the depth-average compaction coefficient of the foundation-soil mass.The results reveal that the foundation-soil mass imaging can accurately reflect the compaction and reinforcement effects of the foundation-soil mass,thereby providing a reliable basis for evaluating the quality of foundation-soil mass reinforcement.