Experimental Study on Dynamic Mechanics of Carbonate Rock under Triaxial Confining Pressure
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摘要: 原位地层中的碳酸盐岩在动态冲击下的力学行为是研究大规模开发碳酸盐岩油气藏的基础。利用真三轴霍普金森压杆装置，对碳酸盐岩在三向围压下的动态力学行为进行研究，测得碳酸盐岩试样在受到三向不同围压、单向冲击荷载作用下的动态应变率和动态抗压强度，揭示出在三向围压下碳酸盐岩受到动态冲击后仅出现微裂缝开裂的特征。Abstract: The dynamic mechanical behavior of carbonate rock subjected to dynamic impact in in-situ formation is one of the basic understandings for the large-scale development of carbonate reservoirs. In this paper, the dynamic mechanics of carbonate rock under true triaxial confining pressures was experimental investigated by 3D Hopkinson pressure bar system. During the experiment, the carbonate rock specimens were under the true triaxial confining pressures and loaded dynamically in one incident bar. The dynamic strain rate and dynamic compressive strength of carbonate rock under true triaxial confining pressures were obtained to characterize the differences in the three vertical directions. The results demonstrate that only microcracks appear in true triaxial confining carbonate rock subjected to the dynamic loading.
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Key words:
- carbonate rock /
- dynamic impact /
- strain rate /
- 3D-Hopkinson pressure bar /
- fracture expansion
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图 1 三向围压动态冲击加载SHPB实验装置示意图
Figure 1. Schematic diagram of triaxial confining impact loading SHPB test system
图 2 碳酸盐岩真三轴动态冲击测试试样
Figure 2. Carbonate rock specimen under triaxial confining impact loading
图 3 碳酸盐岩试样真三轴动态冲击测试原始曲线
Figure 3. Original sampling curves of carbonate rock specimen under true triaxial dynamic impact
图 4 真三轴动态冲击下碳酸盐岩试样的应变率曲线
Figure 4. Strain rate curves of carbonate rock specimen under true triaxial dynamic impact
图 5 碳酸盐岩真三轴动态冲击下试样的 动载荷与动态应变的关系
Figure 5. Dynamic stress-strain curves for carbonate rock specimen tested by true triaxial dynamic impact test
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