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利用WDT–1500多功能材料试验机对砂岩试样进行定围升轴、卸围升轴及定轴卸围3种应力路径下的三轴试验,对比分析砂岩在这3种应力路径下的能量耗散规律,以及能量与围压、岩样变形之间的关系,从而提出不同应力路径下砂岩破坏点的确定方法。试验结果表明:在不同应力路径下岩石的变形破坏过程中都存在能量耗散与释放,能量的释放使得岩石发生破坏;卸围升轴和定轴卸围下砂岩的耗散能相对于定围升轴较小;耗散能和可释放弹性应变能主要受初始轴压和初始围压的影响,并且在不同变形阶段都有明显的围压效应。
Sandstone specimens were tested by the WDT-1500 multi-functional material testing machine under three stress paths, including the fixed shaft, the unloaded shaft and the unloaded shaft. The energy of the sandstone in the three stress paths was compared Dissipation law and the relationship between energy and confining pressure and deformation of rock sample. Then, the method to determine the failure point of sandstone under different stress paths is proposed. The experimental results show that the energy dissipation and release occur during the deformation and failure of rock under different stress paths, and the release of energy causes the rock to be destroyed. The ascending axis is small. The energy dissipation and the releasable elastic strain energy are mainly affected by the initial axial pressure and the initial confining pressure, and have obvious confining pressure effects at different deformation stages.