Abstract：The development of cone penetration test(CPT) at home and abroad is introduced in brief；then the status of CPT technology at home and abroad is expounded. Various sizes and configurations of China¢s double bridge CPT and international piezocone penetration test(CPTU) on Jiangsu clays of China are summarized. According to the CPT and CPTU tests at five sites，parameters measured by the 10 cm2 CPTU are presented and compared to China¢s double bridge 15 cm2 CPT. It is shown that using the 10 cm2 CPTU rather than the 15 cm2 CPT can significantly improve the detection of thin silt layers within clay. The conversion relationship between China¢s double bridge CPT and international CPTU are developed for different soil types. Some conclusions and suggestions are finally put forward. The findings give us the potential use of 10 cm2 international CPTU in practice.
