分段装药爆炸应变场与裂隙场分布规律

左进京; 杨仁树; 龚敏; 谢全民; 赵勇; 尤元元

doi:10.11883/bzycj-2022-0333

分段装药爆炸应变场与裂隙场分布规律

doi: 10.11883/bzycj-2022-0333

1.
北京科技大学土木与资源工程学院，北京 100083
2.
江汉大学省部共建精细爆破国家重点实验室，湖北, 武汉 430056
3.
中国矿业大学（北京）力学与建筑工程学院，北京 100083

基金项目: 国家自然科学基金（52208384，51934001）；中国博士后基金（2020TQ0032）；中央高校基本科研业务专项（FRF-TP-20-037A1，FRF-IDRY-20-019）；江汉大学爆破工程湖北省重点实验室联合开放基金（PBSKL2022C05）

详细信息

作者简介:
左进京（1990－　），男，博士，讲师，cumtbzjj@163.com

通讯作者:
杨仁树（1963－　），男，教授，博士生导师，cumtbyrsz@163.com

中图分类号: O384；O385
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-07
- 修回日期: 2022-10-02
- 网络出版日期: 2022-10-13
- 刊出日期: 2023-03-05

On the distribution of explosion strain field and fracture field in segment charge

1.
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, Hubei, China
3.
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

摘要

摘要: 为探究分段装药爆炸应变场与裂隙场分布规律，采用数字图像相关分析方法与电子计算机断层扫描实验方法，分析了孔内分段装药爆炸全场应变传播规律，建立了爆后“岩石—爆炸裂隙”的三维重构模型，描述了爆炸裂纹位置与形态的空间分布情况，得到岩石材料爆炸裂隙的分形维数与损伤度。研究结果表明：分段装药改变了连续装药对介质的全场应变形态，由一次应变改变为两次应变，在满足第一段炸药对介质的破坏作用下，同时加大了第二段炸药对介质的作用效应；上分段装药占比0.4时，下分段介质受爆炸作用应变峰值更大，更好满足工程实践中下半段岩体对爆炸能量的需求；相同装药系数下，连续装药结构爆炸裂纹没有贯穿试件整体，炮孔封堵段的爆炸裂纹较少，分段装药结构下，由于提高了炸药的位置，使得上部分岩体能够更好地利用炸药爆炸的能量破碎岩石；分段装药岩石整体损伤度较连续装药提高了23.5%，其中上分段岩石损伤差异较大，分段装药上分段损伤度比连续装药提高46.4%。
- 爆炸 /
- 分段装药 /
- 应变场 /
- 裂隙场 /
- 三维重构
Abstract: In order to explore the distribution of the explosion strain field and fracture field of segmented charge explosion, used digital image correlation analysis (DIC) and computerized tomography (CT) scanning experiment analyzed the distribution of the explosion strain field and fracture field of the segment charge, established three-dimensional reconstruction model of “rock-explosion crack”, described the spatial distribution of the location and shape of the explosion crack, and obtained the fractal dimension and damage degree of the explosion crack. The research results show that: the segment charge changes the full-field strain morphology of the medium caused by continuous charge. Under the condition of satisfying the damage effect of upper sublevel explosive on medium, the effect of lower sublevel explosive on medium is increased, at the same time, the time of blast stress wave is prolonged. It can be seen from the three-dimensional cracks of segmented charge and continuous charge explosion, the explosion crack mainly expands along the radial direction, the annular crack formed by axial stress and strain is not obvious, and the radial direction is the main direction of rock failure. When the charge ratio of the upper segment is 0.4, the strain peak value of the lower segment is larger, which better meets the demand of the rock mass for explosion energy in the lower segment in engineering practice. Under the same charging coefficient, the explosive cracks in the continuous charging structure do not run through the whole specimen, and the explosive cracks in the plugging section are less, under the segment charge structure, the upper sublevel of rock mass can better use the energy of explosive explosion to break rock because the position of explosive is improve. The overall damage degree of rock in segment charge is 23.5% higher than that in continuous charge, and the damage degree of rock in upper sublevel is 46.4% higher than that in continuous charge.
- explosion /
- segment charge /
- full-field strain /
- fracture field /
- three dimensional reconstruction

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图 1 超高速数字图像相关实验系统

Figure 1. The ultra high speed digital image correlation system

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图 2 模型加工示意（mm）

Figure 2. Schematic diagiam of model processing (mm)

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图 3 上分段装药占比0.6的全场应变

Figure 3. Whole field strain with the upper section charge ratio of 0.6

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图 4 上分段占比0.4 的全场应变

Figure 4. Whole field strain with the upper section charge ratio of 0.4

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图 5 分段装药径向应变时程曲线

Figure 5. Time history of the radial strains of segment charges

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图 6 岩石分段装药示意

Figure 6. Schematic of rock segment charges

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图 7 被动围压装置

Figure 7. Passive confining pressure device

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图 8 连续装药与分段装药CT扫描原图与灰度处理图

Figure 8. CT scan of continuous charge and segmented charge and gray-scale processing diagram

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图 9 连续装药三维裂隙重构

Figure 9. Three-dimensional fracture recomposition of continuous charge

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图 10 分段装药三维裂隙重构

Figure 10. Three-dimensional fracture recomposition of segmented charge

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图 11 连续装药与分段装药三维体分形维数D

Figure 11. Three-dimensional fractal dimension D of continuous charge and sectional charge

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图 12 各装药分段三维裂隙重构

Figure 12. Three-dimensional fracture reconstruction of each charge segment

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图 13 上/下分段岩体三维体分形维数

Figure 13. Fractal dimension of upper/lower sublevel rock mass

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