粉砂岩三轴压缩CT试验过程的分区定量研究

doi:10.13722/j.cnki.jrme.2015.0974

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摘要为了充分利用CT数定量地研究粉砂岩三轴应力状态下的损伤演化规律，基于破损演化理论及CT数，提出粉砂岩的破损分区方法，将岩石CT扫描断面分为完整区( )、损伤区( )和孔洞裂纹区( )，并定义岩石的孔隙率、损伤率和完整率。分析三轴压缩CT试验过程中粉砂岩孔隙率、损伤率和完整率的变化规律。结果表明，利用提出的方法充分地发挥每个CT数的价值，且能定量地研究岩石的损伤演化规律及其受力过程中应变的局部化；岩石强度及塑性的增大，是由于在围压的作用下，试样只有达到很高的损伤程度，细观损伤裂纹才可以贯通形成宏观裂纹，进而发生破坏；试样两端断面处损伤裂纹出现较晚，破坏突然，且损伤裂纹主要分布在扫描断面的外侧环形统计区域，而试样中间断面处损伤裂纹出现相对较早，损伤裂纹从萌生、扩展到贯通的过程较长，损伤裂纹穿越整个扫描断面。

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关键词 ：岩石力学, 破损分区, 岩石CT试验, 孔隙率, 损伤率

Abstract：In order to quantitatively study the crack development of siltstone under triaxial compression using CT numbers，a damage partition method was proposed based on the theory of damage and the CT data in this study. The CT scanning section of the rock was divided into the complete zone( )，the damaged zone( ) and the hole or crack zone( ). The porosity，the damage rate，the degree of integrity of the rock were defined. The damage development of the siltstone CT test process under triaxial compression was analysed. Using this method，the role of each set of CT data in CT scanning was fully played，the damage and strain localization of the rock under loading be studied quantitatively. Only when the sample reached a high degree of damage under the confining pressure，the mesoscopic fracture cracks were developed into the macroscopic cracks，and the failure occurred，which was the reason of the increasing of rock strength and plasticity. The fracturing cracks on both ends of the specimen appeared late，and the specimen failed suddenly. The fracturing cracks of the scanning section were mainly distributed on the outer circular areas，while the fracturing cracks on middle of the specimen appeared early，had a longer expansion process，and the fracture cracks were across the scanning section.

Key words： rock mechanics damage partition rock CT test porosity damage rate

引用本文:

方建银1，党发宁1，肖耀庭1，2，丁卫华1，方建熙3. 粉砂岩三轴压缩CT试验过程的分区定量研究[J]. 岩石力学与工程学报, 2015, 34(10): 1976-1984.
FANG Jianyin1，DANG Faning1，XIAO Yaoting1，2，DING Weihua1，FANG Jianxi3. QUANTITATIVE STUDY ON THE CT TEST PROCESS OF SILTSTONE UNDER TRIAXIAL COMPRESSION. , 2015, 34(10): 1976-1984.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0974 或 http://www.rockmech.org/CN/Y2015/V34/I10/1976

[3]	范留明，毛黎明，张志禹，等. 岩土CT图像边界伪影的机制分析及试样尺度估计[J]. 岩石力学与工程学报，2006，25(6)：1 198-1 203. (FAN Liuming，MAO Liming，ZHANG Zhiyu，et al. Analysis of geotechnical CT boundary artifact and evaluation of sample scale[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(6)：1 198-1 203.(in Chinese)) " target="_blank">
[4]	范留明，李宁，丁卫华. 数字图像伪彩色增强方法在岩土CT图像分析中的应用[J]. 岩石力学与工程学报，2004，23(13)：2 257-2 261. (FAN Liuming，LI Ning，DING Weihua. Application of pseudo color enhancement method to geotechnical CT image analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(13)：2 257- 2 261.(in Chinese)) " target="_blank">
[13]	党发宁，尹小涛，丁卫华，等. 基于CT试验的岩体分区破损本构模型[J]. 岩石力学与工程学报，2005，24(22)：4 003-4 008.(DANG Faning，YIN Xiaotao，DING Weihua，et al. Subarea breakage constitutive model of rock mass based on CT test[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(22)：4 003-4 008.(in Chinese)) " target="_blank">
[6]	仵彦卿，曹广祝，王殿武. 基于X射线CT方法的岩石小裂纹扩展过程分析[J]. 应用力学学报，2005，22(3)：484-490.(WU Yanqing，CAO Guangzhu，WANG Dianwu. Micro-fracturing processes of rock by real time observation of X-ray CT[J]. Chinese Journal of Applied Mechanics，2005，22(3)：484-490.(in Chinese)) " target="_blank">
[9]	GEIGER J，HUNYADFALVI Z，BOGNER P. Analysis of small- scale heterogeneity in clastic rocks by using computerized X-ray tomography(CT)[J]. Engineering Geology，2009，103(3/4)：112-118. " target="_blank">
[12]	党发宁. 岩土破损演化理论(II)：物理状态指标与分区破损理论[J]. 岩士力学，2005，26(5)：673-679.(DANG Faning. Damage fracture evolution theory of rock and soil(II)：physical state indexes and divisional damage-fracture theory[J]. Rock and Soil Mechanics，2005，26(5)：673-679.(in Chinese)) " target="_blank">
[1]	LANDIS E N，EDWIN N N，KEANE D T. Microstructure and fracture in three dimensions[J]. Engineering Fracture Mechanics，2003，70(7/8)：911-925. " target="_blank">
[2]	ELAQRA H，GODIN N，PEIX G，et al. Damage evolution analysis in mortar，during compressive loading using acoustic emission and X-ray tomography：Effects of the sand/cement ratio[J]. Cement and Concrete Research，2007，37(5)：703-713.
[5]	丁卫华，仵彦卿，蒲毅彬，等. 基于X射线CT的岩石内部裂纹宽度测量[J]. 岩石力学与工程学报，2003，22(9)：1 421-1 425.(DING Weihua，WU Yanqing，PU Yibin，et al. Measurement of crack width in rock interior based on X-Ray CT[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(9)：1 421-1 425.(in Chinese)) " target="_blank">
[8]	任建喜，葛修润. 单轴压缩岩石损伤演化细观机理及其本构模型研究[J]. 岩石力学与工程学报，2001，20(4)：425-431.(REN Jianxi，GE Xiurun. Study of rock meso-damage evolution law and its constitutive model under uniaxial compression loading[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(4)：425-431. (in Chinese))
[11]	党发宁. 岩土破损演化理论(I)：破损空间[J]. 岩土力学，2005，26(4)：513-519.(DANG Faning. Damage-fracture evolution theory of rock and soil(I)：damage—fracture space[J]. Rock and Soil Mechanics，2005，26(4)：513-519.(in Chinese)) " target="_blank">
[7]	尹小涛，党发宁，丁卫华，等. 基于图像处理技术和CT试验的裂纹量化描述[J]. 实验力学，2005，20(3)：448-454.(YIN Xiaotao，DANG Faning，DING Weihua，et al. Quantitative description of crack based on the image measuring technique and CT test[J]. Journal of Experimental Mechanics，2005，20(3)：448-454.(in Chinese)) " target="_blank">
[10]	HAN Y H，HU D D，MATZAR L. Numerical computation of elastic properties for porous rocks based on CT—scanned images using direct mapping method[J]. Journal of Petroleum Science and Engineering，2014，122：346-353. " target="_blank">