CAJ | 학술논문

基于SEM的大理岩试样细观损伤全程跟踪试验方案，选取四川锦屏二级引水隧洞围岩大理岩试样进行试验观察．利用扫描电镜拍摄大量不同荷载作用下的细观损伤演化图像，从中选择有代表意义的图像进行损伤破坏特性分析．研究结果表明，由于应力集中的影；向，预制裂纹大理岩试样在加载初期产生与预制裂纹垂直的微裂纹；随着荷载的增加产生大量的拉裂纹及分叉裂纹，裂纹的扩展方向逐渐向加载轴方向转动；由于初始损伤和损伤的不断积累，压剪作用对岩石的破坏起控制作用，并形成剪切破坏面．
기우SEM적대리암시양세관손상전정근종시험방안，선취사천금병이급인수수동위암대리암시양진행시험관찰．이용소묘전경박섭대량불동하재작용하적세관손상연화도상，종중선택유대표의의적도상진행손상파배특성분석．연구결과표명，유우응력집중적영；향，예제렬문대리암시양재가재초기산생여예제렬문수직적미렬문；수착하재적증가산생대량적랍렬문급분차렬문，렬문적확전방향축점향가재축방향전동；유우초시손상화손상적불단적루，압전작용대암석적파배기공제작용，병형성전절파배면．
Based on the program of SEM tracking marble meso-damage experiments, we select marble rock samples which come from the diversion tunnel of Jinping Hydropower Station in Sichuan Province for experi- mental observation. Using scanning electron microscope shooting a lot of mesoscopie damage evolution images under different loads, meaningful images are choosed for damage failure characteristics analysis. The results show that, as the stress concentration, Micro-cracks which are perpendicular to the pre-crack are formed in precraeked marble specimes in the initial stage load. Lots of the pull - crack and branch crack are emerged- as the load increases, direction of crack propagation turn to the load axis gradually; Finally, As the initial dam- age and damage accumulation, the role of＇compression-shear plays control function to rock damage, and the shear failure plane is formed.