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在单轴压缩下,对经过高温焙烧的含水辉长岩进行了轴向和径向电阻率变化以及体积应变的同时连续测量.结果表明,在完全饱和前的非弹性压缩阶段,电阻率随压应力增高而降低;在完全饱和的弹性压缩阶段,电阻率升高;在非弹性的体积膨胀阶段,电阻率继续上升.从Archie 公式出发,通过近似分析,导出了电阻率变化和体积应变的关系式.实验结果和近似分析定性上相附.本文的主要结果是发现含水岩样在膨胀阶段电阻率的升高,初步认为这是由于热开裂的张开,降低了饱和度的结果.
Under uniaxial compression, simultaneous measurements of axial and radial resistivity changes and volumetric strain of gabbro calcined at high temperature were carried out. The results show that with the inelastic compression stage before complete saturation, The resistivity increases in the fully saturated elastic compression stage and the resistivity continues to increase in the inelastic volume expansion stage.According to Archie’s formula, the relationship between the change of resistivity and the volume strain is derived by approximate analysis The experimental results and the approximate analysis are qualitatively attached.The main result of this paper is that the resistivity of aqueous rock samples during the expansion phase is found to increase, presumably because of the thermal cracking and the decrease of the saturation.