CAJ | 학술논문

利用WDT-1500大型多功能材料试验机对裂隙试样进行定围升轴、卸围升轴和定轴卸围3种应力路径条件下的试验，研究裂隙试样的变形特征、强度特征和破坏机制。试验结果表明：裂隙试样在不同应力路径下的力学参数变化明显：卸围升轴和定轴卸围下试样强度均低于定围升轴下的强度。不同应力路径条件下，试样峰值强度均随着裂隙倾角的增大而先降低后增大，裂隙倾角为30°或45°时最小。试样的力学特性主要受裂隙角度、应力路径、初始围压等的控制，裂隙倾角对峰值强度的影响最大，围压卸荷速率次之，初始围压最小。定围升轴下试样破坏形态多为剪切破坏，而卸围升轴和定轴卸围下试样多为张-剪混合破坏，卸围升轴下试样的张裂纹发育较少，定轴卸围下张裂隙发育显著。
이용WDT-1500대형다공능재료시험궤대렬극시양진행정위승축、사위승축화정축사위3충응력로경조건하적시험，연구렬극시양적변형특정、강도특정화파배궤제。시험결과표명：렬극시양재불동응력로경하적역학삼수변화명현：사위승축화정축사위하시양강도균저우정위승축하적강도。불동응력로경조건하，시양봉치강도균수착렬극경각적증대이선강저후증대，렬극경각위30°혹45°시최소。시양적역학특성주요수렬극각도、응력로경、초시위압등적공제，렬극경각대봉치강도적영향최대，위압사하속솔차지，초시위압최소。정위승축하시양파배형태다위전절파배，이사위승축화정축사위하시양다위장-전혼합파배，사위승축하시양적장렬문발육교소，정축사위하장렬극발육현저。
Triaxial compression tests for cracked samples under axial loading and constant confining pressure, axial loading and radial unloading,constant axial pressure and radial unloading-three stress paths were carried out by using WDT-1500 multi-function material testing machine. The deformation property,strength property and failure mechanism of cracked samples were researched. It shows that there is significant change in mechanical parameters under this three stress paths. The strength of cracked samples of axial loading and radial unloading, constant axial pressure and radial unloading were lower than that of axial loading and constant confining pressure. Under different stress paths,the strength of crack samples decreases first and then increases with the crack angle increases,and reaches minimum at crack angle of 30°or 45°. The mechanical characteristics of cracked samples are mainly related to the crack angle,the loading paths and the initial confining pressures,and the greatest influence factor is the crack angle,the intermediate is the unloading velocity of confining pressure,and the least is the initial confining pressure. The failure characteristics of samples present shear failure under axial loading and constant confining pressure,but it often presents mixed Tensile-shear failure under axial loading and radial unloading,constant axial pressure and radial unloading. Tensile-crack is less under axial loading and radial unloading,but it develops significantly under constant axial pressure and radial unloading.