Abstract: With the rapid development of the engineering construction technology in China, the geotechnical laboratory is required not only to provide more data, but also to have high accuracy of laboratory testing data. Therefore, it is very important to conduct periodical calibrations on the testing procedures, frequently used. easily damaged and constantly unstable equipment. The triaxial testing and the direct shear test devices in the geotechnical tests belong to this type of equipment. The method of periodical calibration of the frequently used equipment is to compare the value of another equipment or several equipment with the same accuracy level. The quality and the representativeness of the standard samples determine the objective accuracy of the geotechnical test data. Therefore, the preparation of the standard samples is an important link that cannot be ignored in the geotechnical test. This paper proposes to use the compaction method to prepare standard samples and select statistical methods to process the comparative test data, to improve the accuracy and reliability of the testing data.

Key words: Geotechnical Laboratory Tests, Periodical Calibration, Standard Sample, Data Processing