Rotary penetration test is a newly developed in-situ testing technology in recent years, which combines the advantages of large drilling depth and continuous, intuitive, good repeatability, fast testing speed, and economy of cone penetration testing data. It uses static pressure and rotational torque to penetrate the soil stratum at a constant speed by standard conical double helix probe, recording the penetration resistance of the probe during the process of uniform penetration, the resistance torque, and water pressure during the process of soil damage. It is a new in-situ testing method for testing and studying the physical and mechanical properties of soil stratum. Through the analysis of mechanism and a large number of field tests, the results of the rotary penetration test (RPT) were analyzed by comparing with data of cone penetration test (CPT), drilling test, field pile test, and others; the characteristic indexes of rotary penetration as well as a series of analysis method and empirical formula were proposed, i.e. how the rotary penetration test results were applied to classify the strata, judge the soil category, determine the basic bearing capacity of the ground and the ultimate bearing capacity of the concrete bored pile. The research results were of great significance to enrich the in situ test method and promote the application and popularization of the rotary penetration technology.

来源平台：ENGINEERING GEOLOGY FOR A HABITABLE EARTH, VOL 4, IAEG XIV CONGRESS 2023