冻融作用下条带状磁铁石英岩破裂失稳过程裂纹演化特征试验研究
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邵国梁, 夏冬, 贾淯斐, 李铸熙, 严加驹
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Experimental Study on Crack Evolution Characteristics of Banded Magnetite Quartzite During Fracture Instabiligy Under Freeze-thaw Action
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Guoliang SHAO, Dong XIA, Yufei JIA, Zhuxi LI, Jiaju YAN
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表2 声发射平均累计参数
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Table 2 Average cumulative parameters of acoustic emission
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| 冻融循环次数 | 平均累计撞击数 | 降低率 /% | 累计能量 /aJ | 降低率 /% | 累计振铃 计数 | 降低率 /% |
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| 干燥 | 159 291 | 0 | 7.95×109 | 0 | 2 983 016 | 0 | | 饱水 | 140 220 | 11.97 | 4.84×109 | 39.20 | 2 063 052 | 30.84 | | 10 | 123 054 | 22.75 | 5.53×109 | 30.53 | 1 495 791 | 49.86 | | 20 | 112 697 | 29.25 | 5.02×109 | 36.91 | 1 230 500 | 58.75 | | 40 | 114 485 | 28.13 | 4.31×109 | 45.80 | 1 391 921 | 53.34 | | 70 | 111 685 | 29.89 | 4.89×109 | 38.53 | 1 353 023 | 54.64 | | 100 | 115 033 | 27.78 | 4.95×109 | 37.78 | 1 528 404 | 48.76 | | 130 | 116 359 | 26.95 | 3.56×109 | 55.30 | 1 387 688 | 53.48 | | 180 | 107 383 | 32.59 | 3.06×109 | 61.48 | 1 144 486 | 61.63 | | 230 | 102 996 | 35.34 | 3.60×109 | 54.74 | 1 243 242 | 58.32 | | 280 | 102 212 | 35.83 | 2.54×109 | 68.10 | 868 746 | 70.88 |
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