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| EXPERIMENTAL TEST ON MARBLE CONTAINING TWO PRE-EXISTING CRACKS UNDER LOADING AND UNLOADING CONDITIONS BASED ON HIGH-SPEED PHOTOGRAPHY |
| SONG Yanqi1，2，LI Ming3，WANG Xiao4，LIU Landong1，LI Xiaorui3，FU Xiaolong1 |
| (1. School of Science，China University of Mining and Technology，Beijing 100083，China；2. State Key Laboratory of Deep Rock Mechanics and Engineering，China University of Mining and Technology，Beijing 100083，China；3. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；4. CNOOC Energy Technology and Services Engineering Technology Co.，Tianjin 300452，China) |
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Abstract 以大理岩作为试验材料，进行了45°双预制裂纹试件的单、双轴加载和侧向卸载试验研究。利用高速摄影设备记录试件中裂纹的起裂、扩展、贯通和完全破坏过程，结合理论分析得到：(1) 3种载荷形式下试件的破坏过程可概括为4个相似的阶段；双轴加载试件的裂纹扩展形态和岩桥贯通方式与单轴加载和卸载有较大不同；卸载试件的裂纹种类和数目远比单轴加载时更多更复杂。(2) 由裂纹类型判断在单、双轴加载时，剪应力对破坏起主导作用；卸载时，尤其破坏前阶段拉应力起主导作用。(3) 定义新参数M-C有效剪应力?M-C，根据其在裂纹尖端附近的分布规律判定新裂纹起裂的危险方位和区域，对比试验过程，得到与预制裂纹夹角约为－135°和45°左右的区域为新裂纹(带)产生的危险区。(4) 加载时岩桥贯通是由剪应力引起，卸载时是由拉剪复合作用引起。
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2015, Vol. 34 
