CAJ | 학술논문

采用MTS815型岩石力学试验机进行了页岩层理面不同角度取芯的力学试验，获得了其力学参数及破坏模式特征。试验表明：层理面不同角度试样力学性质存在较大差异性，平行层理面试样其抗压强度最高，与层理面夹角为30°时抗压强度最低，弹性模量随取芯角度的增加逐渐降低。单轴压缩，夹角为0°时破坏模式主要为沿多个平行层理面竖向劈裂，夹角为30°时沿层理弱面剪切破坏，夹角为60°时为大角度剪切破坏并贯穿60°弱层理面，夹角为90°时主要为层状拉张破坏。三轴压缩，夹角为0°时试样有多条破裂面，呈劈裂与剪切破坏共同作用；夹角为30°时，沿层理面剪切破坏；夹角为60°时，呈现剪切破坏，剪切破裂面与水平面夹角在45°~50°之间；夹角为90°时，以剪切破坏为主，有多条平行开裂层面。页岩层理面表现出明显的弱面特征，研究结果为水力压裂施工设计提供了技术参数。
채용MTS815형암석역학시험궤진행료혈암층리면불동각도취심적역학시험，획득료기역학삼수급파배모식특정。시험표명：층리면불동각도시양역학성질존재교대차이성，평행층리면시양기항압강도최고，여층리면협각위30°시항압강도최저，탄성모량수취심각도적증가축점강저。단축압축，협각위0°시파배모식주요위연다개평행층리면수향벽렬，협각위30°시연층리약면전절파배，협각위60°시위대각도전절파배병관천60°약층리면，협각위90°시주요위층상랍장파배。삼축압축，협각위0°시시양유다조파렬면，정벽렬여전절파배공동작용；협각위30°시，연층리면전절파배；협각위60°시，정현전절파배，전절파렬면여수평면협각재45°~50°지간；협각위90°시，이전절파배위주，유다조평행개렬층면。혈암층리면표현출명현적약면특정，연구결과위수력압렬시공설계제공료기술삼수。
The mechanical characteristics of shale with different beddings coring were investigated by MTS815 rock mechanical test system. The failure modes,deformation and strength characteristics are obtained. The results indicate that:(1) It shows significantly different properties, when the sample paralleled to bedding plane;it has maximum value of compressive strength and minimum value when the sample has a angle of 30° with bedding plane. The elastic modulus deceases with the increase of the coring angle. (2) Under the condition of uniaxial compression, the angle of 0°, the main failure mode is split failure along the beddings;the angle of 30°, it is shear failure along the weakness plane, the angle of 60°, it is wide-angle shear failure along the weakness plane;the angle of 90°, it is stretch-draw failure. (3) Under the condition of triaxial compression, angle of 0°, it shows several failure surfaces, combined split and shear failure actions;the angle of 30°,it shows shear failure along to the beddings;the angle of 60°, it shows shear failure and the angle of failure surface is 45° to 50°;the angle of 90°, it shows shear failure and it has several parallel failure surfaces. The results can provide an important way for fracture optimization design.