Dynamic Mechanical Properties and Damage Evolution in Granite under Coupled High-Temperature-Impact Cyclic Loading
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摘要: 为研究高温-冲击双循环累积损伤对花岗岩动态力学特性的影响，以高径比为0.8的花岗岩试样为研究对象，测得100、300和500 ℃高温下分别循环2、4和6次前后的纵波波速，利用分离式霍普金森压杆试验装置进行冲击气压为0.25、0.30和0.35 MPa的等幅循环冲击试验，研究温度、高温循环次数、冲击气压和冲击次数对花岗岩试样动力学特征的影响，同时基于Lemaitre连续损伤本构模型和应变等价原理定义循环高温和循环冲击累积损伤因子，分析高温-冲击双循环临界累积损伤因子。结果表明：随着初始高温累积损伤和冲击气压的增加，花岗岩试样第一次冲击的裂纹形态由单一裂纹向复杂裂纹演化，贯通度增加，峰值应力依次减小，峰值应变依次增大；花岗岩试样循环冲击中，第一次冲击和最后一次冲击的峰值应力与峰值应变变化显著；对循环高温处理后花岗岩试样的循环动态冲击累积损伤的影响由大到小依次为冲击气压、温度、高温循环次数，得出临界高温-冲击累积损伤因子在0.625～0.676之间，可为深部资源地下开采安全评估提供理论支撑。Abstract: To study the influence of high-temperature-impact dual-cycle cumulative damage on the dynamic mechanical characteristics of granite, specimens with a height-to-diameter ratio of 0.8 were subjected to high-temperature cycling treatments at 100, 300, and 500 ℃ for 2, 4, and 6 cycles, respectively. The P-wave velocities before and after treatments were measured. Constant-amplitude cyclic impact tests under gas pressures of 0.25, 0.30, and 0.35 MPa were conducted using a split Hopkinson pressure bar (SHPB) system. The effects of temperature, high-temperature cycles, impact gas pressure, and impact cycles on the dynamic behavior of granite were systematically investigated. Based on Lemaitre’s continuum damage constitutive model and the strain equivalence principle, cumulative damage factors for high-temperature and impact cycles were defined, and the critical dual-cycle cumulative damage factor was analyzed. Results indicate that with increasing initial high-temperature cumulative damage and impact gas pressure, the crack morphology of granite during the first impact evolved from single cracks to complex crack networks with increased connectivity, while peak stress decreased and peak strain increased. Significant variations in peak stress and strain were observed between the first and final impacts during cyclic loading. The influence of factors on the cumulative impact damage under high-temperature cycling followed the order: impact gas pressure>temperature>number of high-temperature cycles. The critical high-temperature-impact cumulative damage factor was determined to range between 0.625 and 0.676. These findings provide theoretical support for safety assessment in deep underground resource extraction.
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Key words:
- granite /
- cyclic high temperature /
- cyclic impact /
- dynamic characteristics /
- cumulative damage factor
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图 3 循环高温后花岗岩的表观形貌变化
Figure 3. Apparent morphological changes of granite after high-temperature circulation
图 6 第一次冲击后部分花岗岩试样的表观形貌
Figure 6. Apparent morphologies of some granite samples after the first impact
图 7 第一次冲击下花岗岩试样的动态应力-应变曲线
Figure 7. First impact dynamic stress-strain curves of granite specimens
图 8 第一次冲击下花岗岩试样的峰值应力变化
Figure 8. Change of peak stress of granite samples after the first impact
图 9 花岗岩试样第一次冲击峰值应变变化
Figure 9. Change of peak strain of granite samples after the first impact
图 10 花岗岩试样循环冲击部分的动态应力-应变曲线
Figure 10. Partial dynamic stress-strain curves of granite specimens under cyclic impact
图 11 循环冲击下花岗岩试样的峰值应力变化
Figure 11. Change of peak stress of granite samples during cyclic impact process
图 12 循环冲击下花岗岩试样的峰值应变变化
Figure 12. Change of peak strain of granite samples during cyclic impact process
图 13 4次高温循环冲击后花岗岩试样的破坏形貌
Figure 13. Failure morphologies of granite specimens after four high-temperature cycles and impact cycles
图 14 花岗岩试样纵波波速测量
Figure 14. Measurement of longitudinal wave velocity of granite samples
图 15 高温循环下花岗岩高温累积损伤因子变化
Figure 15. Variation of granite high-temperature damage factor under high-temperature cycles
图 16 循环冲击下花岗岩的冲击累积损伤因子变化
Figure 16. Variation of impact cumulative damage factor of granite under cyclic impact
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