含缺陷花岗岩破坏过程中的红外热像试验研究
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摘要
在实验室通过红外热像仪对7块含相同预制单裂纹缺陷的花岗岩板状试样单轴压缩载荷下破裂过程的红外热像进行了试验研究(其中有一块试样中途折断,没有取得红外热像特征)。试验结果表明:试件加载过程中,微破裂越强,其红外辐射也就越强;在主破裂时,试件在局部破坏区域会产生高温条带的红外热像特征。试件受压过程中的红外温度异常表现为3种类型:(1)先降温,临破裂升温;(2)温度交替升降,破裂前升温;(3)缓慢升温,破裂前快速升温。同一种岩石,其破坏时的红外辐射表现不一定相同。
The changing rule for infrared thermal image boding of the rock with crack is essential for the geotechnical engineering,especially for the underground engineering. In order to study the rule,infrared thermal images for the failure process of rock with fracture are carried out. The size of the rock sample is 20 cm×10 cm×2 cm with a crack of 45°to the horizontal direction at the center and with the length of 2 cm. Considering the fact that sample will effect the results of the observation for infrared thermal image during the experiment,the laminated granite sample is used to replace the cylinder or cuboid sample. The achieved results under uniaxial compression indicate that intensity of the microruptures has close relation with the thermal effects. When the main fractures happen,there is a strip of high temperature that will appear at the destructive local area. During loading process,the abnormality of infrared temperature has three kinds of behaviors as follows:(1) temperature falls first and rises just before fracture;(2) temperature rises and falls alternately,and rises before the fracture;and (3) temperature rises slowly at firsta,nd then rises quickly before the fracture appears. Even for the same rock sample, the behaviors of the infrared phenomenon may be different during failure process.
The changing rule for infrared thermal image boding of the rock with crack is essential for the geotechnical engineering,especially for the underground engineering. In order to study the rule,infrared thermal images for the failure process of rock with fracture are carried out. The size of the rock sample is 20 cm×10 cm×2 cm with a crack of 45°to the horizontal direction at the center and with the length of 2 cm. Considering the fact that sample will effect the results of the observation for infrared thermal image during the experiment,the laminated granite sample is used to replace the cylinder or cuboid sample. The achieved results under uniaxial compression indicate that intensity of the microruptures has close relation with the thermal effects. When the main fractures happen,there is a strip of high temperature that will appear at the destructive local area. During loading process,the abnormality of infrared temperature has three kinds of behaviors as follows:(1) temperature falls first and rises just before fracture;(2) temperature rises and falls alternately,and rises before the fracture;and (3) temperature rises slowly at firsta,nd then rises quickly before the fracture appears. Even for the same rock sample, the behaviors of the infrared phenomenon may be different during failure process.
引文
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[2]耿乃光,于萍,邓明德,等.热红外震兆成因的模拟试验研究[J].地震,1998,18(1):83–88.(Geng Naiguang,Yu Ping,Deng Mingde,et al. The simulated experimental studies on cause of thermal infrared precursor of earthquakes[J]. Earthquake,1998,18(1):83–88.(in Chinese))
[3]吴立新,王金庄.煤岩受压屈服的热红外辐射温度前兆研究[J].中国矿业,1997,6(6):42–48.(Wu Lixin,Wang Jinzhuang. Study on thermal infrared radiation temperature omen in coal-measure rock yielding under ground pressure[J]. China Mine Magazine,1997,6(6):42–48.(in Chinese))
[4]吴立新.遥感岩石力学及其新近进展与未来发展[J].岩石力学与工程学报,2001,20(2):139–146.(Wu Lixin. Remote sensing rock mechanics and its recent achievements and future development[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(2):139–146.(in Chinese))
[5] Wu L X,Cui C Y,Geng N G,et al.Remote sensing rock mechanics (RSRM) and associated experimental studies[J]. Int. J. Rock Mech.and Min. Sci.,2000,37(6):879–888.
[6] Wu Lixin,Liu Shanjun,Wu Yuhua,et al. Changes in infrared radiation with rock deformation[J]. Int. J. Rock Mech. and Min. Sci.,2002,39(4):825–831.
[7]董玉芬,王来贵,刘向峰,等.岩石变形过程中红外辐射的试验研究[J].岩土力学,2001,22(2):134–137.(Dong Yufen,Wang Laigui,Liu Xiangfeng,et al. The experimental research of the infrared radiation in the process of rock deformation[J]. Rock and Soil Mechanics,2001,22(2):134–137.(in Chinese))
[8]谭志宏.含缺陷岩石脆性破裂的数值模拟及红外热像研究[硕士学位论文][D].沈阳:东北大学,2003.(Tan Zhihong. Numerical simulation and infrared thermal image research on brittle failure behaviour of medium disfiguration[M. S. Thesis][D]. Shenyang:Northeastern University,2003.(in Chinese))
[9] Tang C A. Numerical simulation of progressive rock failure and associated seismicity[J]. Int. J. Rock Mech. and Min. Sci.,1997,34(2):249–262.
[10] Tang C A,Kou S,Lindqvist P A. Numerical simulation of loading inhomogeneous rocks[J]. Int. J. Rock Mech. and Min. Sci.,1998,35(7):1001–1006.
[11] Tang C A,Lin P,Liu H Y,et al. On failure modes and strength characterization of brittle disordered materials under uniaxial compression and tension[J]. Key Engineering Materials,2000,(183–187):637–642.
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