CAJ | 학술논문

巷(隧)道围岩的显著特点为破裂后承载，破裂围岩强度及变形特征的正确评价对其围岩稳定控制意义明显。以从已破坏返修段巷道现场采集的破裂岩样为研究对象，根据其现场多处于近似零围压或低围压的应力环境，借助 MTS 伺服试验机对其单轴压缩下再破坏时的强度及变形特征进行系统研究。结果表明：破裂面对岩石的峰值强度产生明显的影响，对残余强度无直接决定性的影响；破裂岩样全应力-应变曲线总体可分为单峰型和多峰型2类；破裂面对岩石的割线模量及泊松比、峰值轴向应变影响不明显，但对峰值环向及体积应变影响明显；破裂岩样破裂面扩展过程及最终的破坏模式与原主破裂面的角度有关，主破裂面与加载方向近乎平行时，多发生竖向劈裂破坏，当两者垂直时，多发生竖向劈裂与横向主破裂面贯通破坏，其他情况大多发生竖向劈裂与剪切组合破坏模式；破裂岩样表面破裂面分布具有明显的分形特征，且其单轴压缩峰值强度与其表面破裂面盒维数两者之间总体符合线性单调减函数关系。
항(수)도위암적현저특점위파렬후승재，파렬위암강도급변형특정적정학평개대기위암은정공제의의명현。이종이파배반수단항도현장채집적파렬암양위연구대상，근거기현장다처우근사령위압혹저위압적응력배경，차조 MTS 사복시험궤대기단축압축하재파배시적강도급변형특정진행계통연구。결과표명：파렬면대암석적봉치강도산생명현적영향，대잔여강도무직접결정성적영향；파렬암양전응력-응변곡선총체가분위단봉형화다봉형2류；파렬면대암석적할선모량급박송비、봉치축향응변영향불명현，단대봉치배향급체적응변영향명현；파렬암양파렬면확전과정급최종적파배모식여원주파렬면적각도유관，주파렬면여가재방향근호평행시，다발생수향벽렬파배，당량자수직시，다발생수향벽렬여횡향주파렬면관통파배，기타정황대다발생수향벽렬여전절조합파배모식；파렬암양표면파렬면분포구유명현적분형특정，차기단축압축봉치강도여기표면파렬면합유수량자지간총체부합선성단조감함수관계。
The prominent characteristic of the surrounding rock of tunnel is its capacity after it was broken. Correct evaluation of the strength characteristics and deformation behavior of the broken sur-rounding rock have an important significance on the surrounding rock stability control. In this paper, taking acquired cracked rock samples from the failure surrounding rock in km deep mine as the research object, according to the low even approximate to zero confining stress states of the broken surrounding rock, re-fracture tests of the cracked rock samples have been conducted by the MTS machine under uniaxial compression to study its strength characteristics and deformation behavior systematically. The results show that the fracture plane has obvious effect on the uniaxial compressive peak strength, but it <br> has no direct and decisive influence on the residual strength; the stress-strain curves of cracked rock samples can be generally divided into two types, single peak and multi-peak;the fracture plane has no obvious effect on secant modulus,the Poisson’s ratios and peak axial strain, but it has obvious influence on peak hoop strain and volumetric strain;there is a close relation between the expansion process and failure mode of the fracture plane and angle of the main rupture surface—when the direction of loading direction is consistent with main rupture surface, failure mode is mainly vertical splitting, on the con-trary, when the direction of the former is perpendicular to the latter, it is mainly vertical splitting holing through the main rupture surface, and combination of shear and splitting mainly occurs in other situa-tions. The distribution of the fracture plane on surface of the cracked rock samples shows obvious frac-tal characteristics, and the uniaxial compressive peak strength is a linear monotone minus function to the Box Counting Dimension.