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

摘要：

该固体围压介质高温高压岩石变形实验装置的应力和围压修正方法是从长春地质学院岩石变形实验室的三轴实验系统中经过实验总结出来的,简便易行,可应用于同类系统的实验设备。确定了该实验装置采用氯化钠传压介质时氯化钠的传压特性和内部摩擦力的大小,并进一步确定出样品实际所受的围压和应力与表观值间的关系,求出修正量,从而应用于具体的实验研究中。

关键词: 压力标定, 岩石变形实验, 应力, 传压介质