混凝土样品受压破裂过程中的电磁信号
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摘要
对混凝土样品受压破裂过程中的电磁现象进行了实验，发现样品在单轴压力下出现微裂纹时伴随有电磁脉冲信号出现，开始产生这类信号的时段在混凝土破坏强度的８０％左右。在混凝土样品即将解体之前，电磁信号频带较宽，幅度也铰大。这种信号与混凝土解体前的微裂纹的发展有较大的相关性，因此，用电磁法监测大型工程的安全是一种有希望的监测方法。
The testing study is made on the electromagnetic phenomena during fracture of concrete and the testing result indicates that some electromagnetic pulse signals occurr accompanying the microfracturing of concrete samples under the axial compression. The pulse signals start at about 80% of the fracture strength of concrete. During this period, the frequency band of the electromagnetic signals is wide and their amplitude is rather large. There is a close correlation of the occurrences between the electromagnetic pulse signals and microcracks before the main fracture of the concrete samples. Hence the electromagnetic method is considered as a hopeful method for the safety monitoring of large-scale constructions.
The testing study is made on the electromagnetic phenomena during fracture of concrete and the testing result indicates that some electromagnetic pulse signals occurr accompanying the microfracturing of concrete samples under the axial compression. The pulse signals start at about 80% of the fracture strength of concrete. During this period, the frequency band of the electromagnetic signals is wide and their amplitude is rather large. There is a close correlation of the occurrences between the electromagnetic pulse signals and microcracks before the main fracture of the concrete samples. Hence the electromagnetic method is considered as a hopeful method for the safety monitoring of large-scale constructions.
引文
1钱书清,张以勤,曹惠馨.花岗岩洞瀑破时伴随岩石破裂的电磁辐 射[J]. 地球物理学报,1983,26(增):1～7
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9 耿乃光.樊正芳,籍全权等. 徽波遥感技术在岩石力学中的应用[J]. 地震学报.1995,17(4):482～486
10 张德齐. 地震电磁辐射前兆判据探讨[J].地震学报,1992,14(4): 1～7
11 张德齐.王盛飞,刘福等 .南黄海M6.1地震电磁辐射特征[J]. 地 震学报.1997,19(2):3～26
12 袁家治.高桥耕三,钱书清等.UJLF和VLF地震电磁辐射的观测 与研究[J].地震学报,1996.18(2):272～275
13 Fujinawa Y. Takahashi K, Matsumoto T, et al. Experiments to locatesources of earthquake-related VLF electromagnetic signals[J] Pro-ceedings of the Japan Academy, Ser B. 1997. 73(3): 33～38
14 Brady B T, Rowell G A. Laboratory investigation of the electrody-namics of rock fracture[J]. Nature. 1986, 321(6069): 488-492
15 吴科如.严 安,张 车等.混凝土断裂面参数的测试[J].岩石力 学与工程学报.2001,20(增大):1454～1457
2 Yamada I. Masuda K, Mizutani H. Electromagnetic and acousticemission associated with rock rracture[J]. Phys. Earth Planet. Inter.1989, 57(1/2): 157-168
3 Enomoto Y. Hashimoto H. Emission of charged particles fromindentation fracture of rock[J]. Nature. 1990, 346(6285): 641-643
4 郭自强.地震低频电磁辐射研究[J].地球物理学报,1994.37(增): 261～268
5 钱书清.陈智勇.李彦堂等. 大同5.5级地震前的电磁前兆信号[J]. 地震地磁观测与研究.1996,17(1):55～60
6钱书清,任克新,吕 智 伴随岩石破裂的VLF.MF.HF和VHF 电磁辐射特性的实验研究[J].地震学报.1996.18(3):346～351
7 钱书清.吕 智.任克新,地震电磁辐射前兆不同步现象物理机 制的实验研究[J].地震学报,1998,20(5):535～540
8 郝锦绮.黄平章,周建国 .微破裂对岩石剩磁的影响──对地震预 报的意义[J].地球物理学报,1993.36(2):203～211
9 耿乃光.樊正芳,籍全权等. 徽波遥感技术在岩石力学中的应用[J]. 地震学报.1995,17(4):482～486
10 张德齐. 地震电磁辐射前兆判据探讨[J].地震学报,1992,14(4): 1～7
11 张德齐.王盛飞,刘福等 .南黄海M6.1地震电磁辐射特征[J]. 地 震学报.1997,19(2):3～26
12 袁家治.高桥耕三,钱书清等.UJLF和VLF地震电磁辐射的观测 与研究[J].地震学报,1996.18(2):272～275
13 Fujinawa Y. Takahashi K, Matsumoto T, et al. Experiments to locatesources of earthquake-related VLF electromagnetic signals[J] Pro-ceedings of the Japan Academy, Ser B. 1997. 73(3): 33～38
14 Brady B T, Rowell G A. Laboratory investigation of the electrody-namics of rock fracture[J]. Nature. 1986, 321(6069): 488-492
15 吴科如.严 安,张 车等.混凝土断裂面参数的测试[J].岩石力 学与工程学报.2001,20(增大):1454～1457
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