爆炸加载下混凝土表面的裂纹扩展

崔新男; 汪旭光; 王尹军; 陈志远

doi:10.11883/bzycj-2019-0364

爆炸加载下混凝土表面的裂纹扩展

doi: 10.11883/bzycj-2019-0364

崔新男^1,,
汪旭光^{1, 2, ,},
王尹军²,
陈志远¹

1.
中国矿业大学（北京）力学与建筑工程学院，北京 100083
2.
矿冶科技集团有限公司，北京 100160

基金项目: 国家自然科学基金（51664007）；中国工程院咨询研究项目（2018-XY-12）

详细信息

作者简介:
崔新男（1986－　），男，博士研究生，工程师，chester_tsui@sina.cn

通讯作者:
汪旭光（1939－　），男，博士，教授，243458313@qq.com

中图分类号: O389; TD235
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-19
- 修回日期: 2020-02-28
- 网络出版日期: 2020-04-25
- 刊出日期: 2020-05-01

External crack propagation of concrete surface under explosive loading

1.
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2.
BGRIMM Technology Group, Beijing 100160, China

摘要

摘要: 为深入研究内爆加载下岩土类材料的破坏机理，提出了一种新的爆炸裂纹检测算法，采用数字图像相关方法测量表面位移场和应变场，建立了裂纹扩展和扩张模型，并通过混凝土内爆试验观测裂纹扩展过程，研究了裂纹长度扩展与宽度扩张规律。结果表明，裂纹长度扩展是应力波和爆生气体共同作用的结果，裂纹最大扩展速度为225.95 m/s，平均速度为122.27 m/s，裂纹总长159.92 mm，长度扩展止于1.75 ms；裂纹的张开由气体主导，最大宽度1.59 mm，作用时间长达4.5 ms；拉应变集中区先于裂纹出现，其形状决定了裂纹的走向和趋势，爆炸加载下断裂过程区长度为骨料粒径的8～9倍。
- 爆炸载荷 /
- 表面裂纹 /
- 混凝土 /
- 高速数字图像相关 /
- 数字图像处理 /
- 断裂过程区
Abstract: To further investigate the failure mechanism of geotechnical materials under implosion loading, a novel blasting crack detection algorithm is proposed in this paper, the digital image correlation method is used to measure the surface displacement field and strain field, the crack propagation and expansion model is built. A concrete blasting experiment was carried out, the crack propagation and expansion process were measured and analyzed. The results show that the propagation of crack is a combined action of stress wave and explosive products. The maximum velocity is 225.95 m/s, the average velocity is 122.27 m/s, the total length is 159.92 mm, and the length propagation ceases at 1.75 ms. The opening of the crack is dominated by explosive products with a maximum width of 1.59 mm. The action time of explosive products is 4.5 ms. The tensile strain concentration zone appears before the initiation of crack and its shape determines the tendency of the crack. The fracture process zone is about 8−9 times of the maximum aggregate size.
- explosive loading /
- external crack /
- concrete /
- high-speed DIC /
- digital image processing /
- fracture process zone

HTML全文

图 1 裂纹检测过程

Figure 1. Crack detection process

下载: 全尺寸图片幻灯片

图 2 混凝土表面裂纹扩展试验系统

Figure 2. Experiment system for crack propagation of concrete surface

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图 3 裂纹扩展过程

Figure 3. Crack propagation progress

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图 4 裂纹长度和扩展速度曲线

Figure 4. Curves of crack length and propagation velocity

下载: 全尺寸图片幻灯片

图 5 水平位移场的演化过程

Figure 5. Evolution of horizontal displacement field

下载: 全尺寸图片幻灯片

图 6 裂纹张开宽度随时间和裂纹长度的变化曲线

Figure 6. Curves of crack width with time and crack length

下载: 全尺寸图片幻灯片

图 7 最大主应变场的演化过程

Figure 7. Evolutionary process of maximum principle strain field

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图 8 断裂过程区发展过程

Figure 8. Propagation of fracture zone

下载: 全尺寸图片幻灯片

表 1 混凝土模型物理力学参数

Table 1. The physical and mechanical parameters of the concrete model

混凝土标号容重/(kg·m⁻³) 抗压强度/MPa 弹性模量/GPa 抗拉强度/MPa 泊松比

C30 2.7×10³ 42.5 31.2 3.2 0.3

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表 2 断裂过程区尺寸

Table 2. Sizes of fracture process zone

时间/ms FPZ宽度/mm FPZ长度/mm

0.50 33.82 132.64
0.75 47.17 129.30
0.80 48.95 132.16
1.00 52.51 −
2.00 50.73 −
3.00 49.84 −
4.00 51.62 −

下载: 导出CSV

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