基于CT的混凝土试样静动力单轴拉伸破坏裂纹分形特征比较研究

doi:10.13722/j.cnki.jrme.2014.0561

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摘要为了能定量地利用CT数资源研究混凝土静动力强度特性及裂纹演化规律，利用适合CT扫描仪的便携式动力加载设备，对圆柱体混凝土试样进行单轴静动力拉伸CT试验，并利用编制的差分盒维数计算程序计算CT扫描断面的分形维数，以此为基础从细观层面上比较分析混凝土静动单轴拉伸强度特性、受力破坏机制及裂纹分形特征。结果表明：静力拉伸荷载条件下混凝土破坏时裂纹扩展速度慢，破裂面粗糙曲折，裂纹绕着骨料追随最薄弱界面发展；动力拉伸时裂纹扩展速度快，破裂面较平直，裂纹切割骨料追随能量释放最快路径发展；静动力拉伸CT扫描断面分形特征明显，分形维数随裂纹扩展成规律发展，能较好地反映出混凝土材料损伤裂纹的演化规律，可以定量表述试样的破损程度，可作为裂纹演化的定量参数。

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关键词 ：建筑材料, 混凝土CT试验, 便携式加载设备, CT扫描断面, 损伤裂纹, 分形维数

Abstract：In order to study the static and dynamic strength and crack evolution law of concrete quantitatively by using CT numbers，the portable loading device suitable for CT scanner is used to carry out the static and dynamic uniaxial tensile tests of the cylindrical concrete specimen. Then，the fractal dimension of CT scan section is calculated by using differential box program. And on this basis，the differences of the uniaxial tensile strength feature，failure mechanism and fractal characteristics of crack of the concrete samples under static and dynamic loading were analyzed comparatively from the microscopic level. The results show that the damaged crack of concrete under static uniaxial tensile load grows slowly，the crack surface is rough and twists，and the crack around aggregate follows the weakest interface. The damaged crack of concrete under dynamic uniaxial tensile load grows quickly，the crack surface is flat，and the crack cutting aggregate follows the path which energy released fastest. The static and dynamic CT scan sections have obvious fractal characteristics. The fractal dimension develops with the crack propagation regularly. The CT scan section can well reflect the crack evolution law of the concrete material and can be used as a quantitative parameter of the crack evolution.

Key words： building material concrete CT test portable loading device CT scan section fracture crackfractal dimension

引用本文:

党发宁，方建银，丁卫华. 基于CT的混凝土试样静动力单轴拉伸破坏裂纹分形特征比较研究[J]. 岩石力学与工程学报, 2015, 34(s1): 2922-2928.
DANG Faning，FANG Jianyin，DING Weihua. FRACTAL COMPARISON RESEARCH OF FRACTURE OF CONCRETE SAMPLES UNDER STATIC AND DYNAMIC UNIAXIAL TENSILE USING CT. , 2015, 34(s1): 2922-2928.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0561 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2922

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