关键词: 压力标定, 岩石变形实验, 应力, 传压介质

Abstract:

There is a great difference between the real confining pressure and axial stress in the specimens in the high pressure-temperature experiment, because of the existence of frictions between the pressure medium assembly and the wall of the vessel and the specimen assembly, and of the behavior of pressure transmitting solid medium in use. The two factors causing the error were determined by experiments.This paper is to introduce a new mothod of pressure calibration and the calibration results. The performance of NaCl to transmit pressure is obviously improved with temperature increasing, but without apparent variation with increasing confining pressure. The values of the frictions decrease with elevated temperature and increase with increasing confining pressure. Generally, the quantity of modified confining pressure and axial load determined is considerably high, even up to several hundred MPa, much of which may be taken by the high friction in the vessel.

Key words: Pressure Calibration, Rock deformation, Stress, Pressure transmitting medium