Abstract: In order to make good use of the standard penetration test (SPT) results on British Standard (BS) equipment during the Chinese geotechnical design, BS and Chinese Standard (GB) SPT equipment and results are analyzed to evaluate their correlation. The main difference between BS and GB equipment is that BS anvil quality is larger than GB; and different hitting energy and SPT values are caused. SPT analyzer has been used to measure the actual hitting energy of SPT on BS and GB equipments configured with different diameter rods. In order to analyze the correlation between SPT values of BS and GB, and establish correlation formula, the BS and GB energy ratio that actual hitting energy was divided by theory hitting energy are calculated. The conclusions are as follows: BS equipment is smaller hitting energy and the value of SPT is higher than GB equipment. The rod 50 mm in diameter has higher hitting energy and smaller value of SPT than the rod 42 mm in diameter. Correlation of the standard penetration test results on BS and GB has been set up. Therefore the data based on BS SPT equipments will be more reliable to be utilized in GB and also evaluate the appropriated geotechnical parameter in terms of GB SPT results.

Key words: standard penetration test (SPT), British Standard (BS), Chinese Standard (GB), anvil quality, hitting energy