| 谢璨*,高有湖,李树忱,陈元培.预制裂隙岩石渐进破坏特性的光弹性试验研究[J].实验力学,2020,35(5):935~942 |
| 预制裂隙岩石渐进破坏特性的光弹性试验研究 |
| Photoelastic experimental study on progressive failure characteristics of fractured rock |
| 投稿时间：2019-08-23 修订日期：2019-10-16 |
| DOI：10.7520/1001-4888-19-144 |
| 中文关键词: 裂隙岩石 光弹性 渐进破坏 能量耗散 应变能 |
| 英文关键词:fractured rock photoelasticity progressive failure energy dissipation strain energy |
| 基金项目:国家自然科学基金(51879150)资助；齐鲁交通发展集团科技项目(2016B20)资助 |
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| 中文摘要: |
| 为了全面深入地研究裂隙岩石的渐进破坏过程，利用PS-A光弹贴片，开展裂隙岩石光弹性单轴压缩试验。根据光学-应力定律求得裂隙岩石试样表面的全场主应变差和主应力差，分析裂隙倾角对岩石强度特性的影响；基于能量耗散原理，从应变能的角度揭示不同倾角裂隙岩体非线性渐进破坏过程的能量变化。试验结果表明：加载初期，裂隙岩石试样的主应变差及主应力差最大值分布在预制裂纹中心，屈服强度之后，裂隙两端主应变差及主应力差逐渐变为最大，预制裂隙开始扩展；裂隙岩石试样的裂隙倾角越大，其屈服强度、峰值强度及能量密度越小，但裂隙倾角由45°增加至60°时，各能量密度的减小幅度较小。 |
| 英文摘要: |
| In order to fully and thoroughly study the progressive failure characteristics of fractured rocks, the photoelastic uniaxial compression test on the progressive failure characteristics of rock-like with different dip angle cracks was carried out by means of a reflective photoelastic instrument. Based on the optical-stress law, the full-field stress and strain on specimen surface are calculated and the strength characteristics of rock with different dip angles are analyzed. Based on the principle of energy dissipation, the energy variation of the nonlinear progressive failure process of rock masses with different dip angles is revealed from the perspective of strain energy. The results showed that: at the initial stage of loading, the main strain difference and the main stress difference of the fractured rock sample are distributed at the center of the pre-crack, As the loading continues, the main strain difference and the main stress difference of the fractured rock sample are distributed at the both ends of the crack; the yield strength and peak strength of fractured rock specimens decrease with the increase of fracture dip angle; Maximum energy density, maximum dissipative energy density, maximum elastic energy density absorbed by fractured rock samples decrease with the increase of fracture dip angle, however, when the crack inclination angle is increased from 45° to 60°, the decrease in energy density is small. |
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