Abstract: In the work of geotechnical investigation in Astana, Kazakhstan, we found that the equipment specifications and test data recording methods of KDZ-001 heavy cone dynamic penetration detector adopted by the Almaty Geological Exploration Center are different from the requirements of relevant Chinese codes. The test results take the dynamic penetration resistance q_d as the only index, so it is impossible to carry out engineering geological evaluation according to the Chinese standard heavy dynamic penetration hammer number N'_63.5. In this paper, by comparing and analyzing the specifications and test process of KDZ-001 heavy cone dynamic penetration probe, we propose a novel method to convert the revised heavy dynamic penetration hammer number N'_63.5 into dynamic penetration resistance q_d for engineering geological evaluation, and establish a reference table for evaluating the compactness of gravel soil with q_d as the index. In the investigation practice, we applied the method to evaluate the compactness of gravel soil in Astana area, then we carried out the physical mechanical stratification. Finally, we carried out the engineering geological evaluation on the bearing capacity of sand and gravel soil in Astana area, by combining with the geotechnical test report and other in-situ test reports, and achieved good effects.