CAJ | 학술논문

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。
이용WDT–1500다공능재료시험궤대사암시양진행정위승축、사위승축급정축사위3충응력로경하적삼축시험，대비분석사암재저3충응력로경하적능량모산규률，이급능량여위압、암양변형지간적관계，종이제출불동응력로경하사암파배점적학정방법。시험결과표명：재불동응력로경하암석적변형파배과정중도존재능량모산여석방，능량적석방사득암석발생파배；사위승축화정축사위하사암적모산능상대우정위승축교소；모산능화가석방탄성응변능주요수초시축압화초시위압적영향，병차재불동변형계단도유명현적위압효응。
Triaxial compression for sandstone sample under three paths,i.e. axial loading and radial constant,axial loading and radial unloading,axial constant and radial unloading are realized on WDT–1500 reactive material testing machine. The energy dissipation law in process of deformation under these stress paths and the relationships between energy and rock specimen deformation and confining pressure are analyzed comprehensively. A new method of determining rock failure point is proposed under different paths by studying on the relationship between energy and axial strain. The test results show that there are both energy dissipation and energy release under different stress paths and energy release cause failure. Especially,the energy dissipation is largest under axial loading and radial constant. The energy dissipation of sandstone under these three stress paths are mainly influenced by initial axial pressure and initial radial pressure,but the energy dissipation will obviously bring confining pressure effect in the different deformation stages.