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| 含不同倾角裂隙花岗岩三轴压缩力学特性试验研究 |
| Mechanical Properties of Fractured Granite with different dip angle under Triaxial Compression |
| 投稿时间：2024-02-28 修订日期：2024-03-21 |
| DOI： |
| 中文关键词: 岩石力学 裂隙倾角 三轴压缩 力学特性 声发射特征 |
| 英文关键词:rock mechanics crack inclination angle triaxial compression mechanical properties acoustic emission characteristics |
| 基金项目:湖南省自然科学(编号:2023JJ30511) |
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| 中文摘要: |
| 对含不同倾角的裂隙花岗岩开展了常规三轴压缩试验，配合声发射（Acoustic Emission，AE）系统进行全过程的信息监测，对破坏过程的力学特性及声发射特征开展了研究，结果表明：岩石应力-应变曲线特征受裂隙影响显著，裂隙岩样在破裂过程中应力局部波动明显并发生多次应力降，其脆性特征出现弱化。裂隙破坏了岩石的结构完整性，造成岩石抵抗破坏能力的下降，降低比例高达41.4%；随着裂隙倾角由0°增加90°，花岗岩抗压强度呈现先减小后增大的变化趋势；裂隙的存在增加了岩样非均质性，促使岩样弹性模量的减小。裂隙岩样破坏模式为“穿切裂隙面破坏”和“沿裂隙面剪切破坏”2种模式，其主要取决于裂隙面与最大主应力夹角的大小。裂隙倾角影响了裂隙岩石破裂过程中AE信号变化规律，尤其是30°，45°及60°倾角岩样，AE振铃计数出现明显的“迁移”现象，信号集中分布区拓宽并向后推移；随着倾角增加，岩石破裂活跃程度呈现先减小后增大变化趋势。 |
| 英文摘要: |
| Conventional triaxial compression tests were conducted on fractured granite with different dip angles, and the entire process was monitored using an Acoustic Emission（AE） system. The mechanical and acoustic emission characteristics of the failure process were studied. The results showed that the stress-strain curve characteristics of the rock were significantly affected by the fractures, and the fractured rock samples experienced significant local stress fluctuations and multiple stress drops during the fracture process, weakening their brittle characteristics. Cracks disrupt the structural integrity of rocks, leading to a decrease in resistance to failure, with a reduction rate of up to 41.4%; As the inclination angle of the cracks increases from 0° to 90°, the compressive strength of granite shows a trend of first decreasing and then increasing; The presence of cracks increases the heterogeneity of rock samples and promotes a decrease in their elastic modulus. The failure modes of fractured rock samples are "through cutting fracture surface failure" and "shear failure along fracture surface", which mainly depend on the angle between the fracture surface and the maximum principal stress. The inclination angle of fractures affects the variation pattern of AE signals during the fracturing process of fractured rocks, especially for rock samples with 30°, 45°, and 60° inclination angles. The AE ringing count shows a significant "migration" phenomenon, and the signal concentration distribution area widens and moves backwards; As the dip angle increases, the degree of rock fracture activity shows a trend of first decreasing and then increasing. |
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