混凝土单轴动力压缩CT试验过程定量化分区研究

方建银1,党发宁1,丁卫华1,李晓荣2,王平3

振动与冲击 ›› 2016, Vol. 35 ›› Issue (9) : 13-19.

PDF(26711 KB)
PDF(26711 KB)
振动与冲击 ›› 2016, Vol. 35 ›› Issue (9) : 13-19.
论文

混凝土单轴动力压缩CT试验过程定量化分区研究

  • 方建银1,党发宁1,丁卫华1,李晓荣2,王平3
作者信息 +

Quantitative Partition Study of the Process of Concrete CT Test under the Uniaxial Dynamic Compression#br#

  • FANG Jianyin1,DANG Faning1,DING Weihua1, LI Xiaorong2,WANG Ping3
Author information +
文章历史 +

摘要

为了能定量地研究混凝土动力压缩CT试验过程,将基于模糊集合论的破损演化理论引入到混凝土动力CT试验研究中,基于λ1-λ2截集将混凝土CT扫描图分为孔洞裂纹(P0-λ1)、硬化水泥石(Pλ1-λ2)及骨料(Pλ2-1),并定义了混凝土的孔隙率、硬化水泥石率和骨料率。研究了动力单轴压缩CT试验过程中混凝土试样各扫描断面P0-λ1、Pλ1-λ2及Pλ2-1随加载的变化规律。研究结果表明:利用本方法实现了对混凝土各组分的定量化分区;可以定量地研究混凝土中P0-λ1、Pλ1-λ2及Pλ2-1随动力加载的具体变化规律;能较好地描述混凝土的受力破坏过程;并能定量地体现出试样破坏过程中应变的局部化。

Abstract

In order to study the process of concrete CT test under uniaxial dynamic compression quantitatively, the theory of damage evolution based on fuzzy set is introduced into the study of concrete CT test. Based on the lambda 1~2 sets, the CT images be divided into hole or crack zone (P0-λ1), hardened cement paste area (Pλ1-λ2) and aggregate area (Pλ2-1). Furthermore, the porosity, hardened cement paste rate and aggregate rate are also defined. Finally the changing law of P0-λ1、Pλ1-λ2 and Pλ2-1 during the process of concrete CT test which under uniaxial dynamic compression are studied. It can be concluded that using this method the quantitative subarea of each component of concrete can be realized. The changing law of P0-λ1、Pλ1-λ2、Pλ2-1and in concrete during the loading can be studied quantitatively. The failure process of concrete can be described also, and the strain localization of the specimen during the failure process can be reflected quantitatively.

关键词

水工材料 / 定量化分区 / 混凝土动力CT试验 / 截理 / 孔隙率

Key words

Hydraulic material / Quantitative subarea / Concrete CT test under dynamic load / Joint;Porosity

引用本文

导出引用
方建银1,党发宁1,丁卫华1,李晓荣2,王平3. 混凝土单轴动力压缩CT试验过程定量化分区研究[J]. 振动与冲击, 2016, 35(9): 13-19
FANG Jianyin1,DANG Faning1,DING Weihua1, LI Xiaorong2,WANG Ping3. Quantitative Partition Study of the Process of Concrete CT Test under the Uniaxial Dynamic Compression#br#[J]. Journal of Vibration and Shock, 2016, 35(9): 13-19

参考文献

[1]  杨更社,刘慧.基于CT图像处理技术的岩石损伤特性研究[J].煤炭学报,2007(32):464-468.
YANG Geng-she,LIU Hui.Study on the rock damage characteristics based on the technique of CT image processing[J].Journal of China Coal Society,2007,(32):463-468.(in Chinese)
[2]  任建喜,葛修润,蒲毅彬.岩石卸荷损伤演化机制CT实时分析初探[J].岩石力学与工程学报,2000,19(6):697-701.
REN Jian-xi,GE Xiu-run,PU Yi-bin.Primary study of real time CT testing of unloading damage evolution law of rock [J].Chinese Journal of Rock Mechanics and Engineering,2000,19(6):697-701.(in Chinese)
[3] Landis E.N, Edwin N.N, Keane D.T. Microstructure and fracture in three dimensions [J]. Engineering Fracture Mechanics , 2003, 70:911-925.
[4] 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, 37:703–713.
[5] T.J Chotard,M.P Boncoeur-Martel, A Smith, et a1.Application of X-ray computed tomography to characterise the early hydration of calcium aluminate cement[J].Cement and Concrete Composites,2003,25(1):145-152.
[6] 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):1421-1425.
Ding Wei-hua, Wu Yan-qing, Pu Yi-bin, 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):1421-1425. (in Chinese)
[7] John.S.Lawer, Denis.T.Keaen, Surendra P.Shah. Measuring three-dimensional damage in concrete under compression[J]. Materials Journal. 2001, 98(6):465-475.
[8] 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 Yan-qing, CAO Guang-zhu, WANG Dian-wu. 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)
[9] 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 Xiao-tao, DANG Fa-ning, DING Wei-hua, 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)
[10] 田威,党发宁,陈厚群.动力荷载作用下混凝土破裂特征的CT试验研究[J].地震工程与工程振动,2011, 31(1):30-34.
TIAN Wei, DANG Fa-ning, CHEN Hou-qun. CT experimental study on failure characteristics of concrete under dynamic loading [J]. Journal Of Earthquake Engineering And Engineering Vibration, 2011, 31(1): 30-34. (in Chinese)
[11] 陈厚群,丁卫华,党发宁,等.混凝土CT图像中等效裂纹区域的定量分析[J].中国水利水电科学研究院学报,2006,4(1):1-7.
CHEN Hou-qun, DING Wei-hua, DANG Fa-ning, et al. Quantitative analysis of equivalent crack region in CT images of concrete [J]. Journal of China Institute of Water Resources and Hydropower Research, 2006, 4(1):1-7. (in Chinese)
[12] 陈厚群,丁卫华,蒲毅彬,等.单轴压缩条件下混凝土细观破裂过程的X射线CT实时观测[J].水利学报,2006, 37(9):1044-1050.
CHEN Hou-qun , DING Wei-hua , PU Yi-bin, et al. Real time observation on meso fracture process of concrete using X-ray CT under uniaxial compressive condition [J]. SHUI LI XUE BAO, 2006, 37(9):1044-1050. (in Chinese)
[13] 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 Fa-ning. Damage-fracture evolution theory of rock and soil(1):damage—fracture space[J]. Rock and Soil Mechanics, 2005, 26(4):513-519. (in Chinese)
[14] 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 Fa-ning. 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)
[15]  田威,党发宁,丁卫华,梁昕宇,陈厚群.适于CT试验的动态加载设备研制及其应用[J].岩土力学,2010. 31(1):329-313.
TIAN Wei, DANG Fa-ning, DING Wei-hua ,LIANG Xin-yu, CHEN Hou-qun. Development of a dynamic loading apparatus for CT experiment and its application [J]. Rock and Soil Mechanics, 2010, 31(1):329-313. (in Chinese)

PDF(26711 KB)

378

Accesses

0

Citation

Detail

段落导航
相关文章

/