基于高速DIC技术的柱状装药砂岩爆破应力波衰减试验研究。

IF 3.9 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Li Chengjie, Wang Mengqi, Xie Shoudong, An Qi, Yu Mengyao
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引用次数: 0

摘要

爆破应力波在岩土介质中的传播衰减特性直接影响着岩土介质的断裂行为,是优化爆破参数设计的重要依据。为了研究柱状冲击波在岩石中的衰减特性,采用柱状装药的砂岩进行了室内爆破试验。利用数字图像相关技术成功捕获了爆破过程中钻孔周围的全场应变演化,得到了钻孔周围岩石的应变-时间曲线。为了考虑爆破应力波加载速率对动弹性模量的影响,进行了劈裂霍普金森压杆试验,建立了动弹性模量与应变速率之间的精确关系。通过分析峰值应变的衰减,建立了裂隙带内应力波衰减方程,并计算了应力波衰减指数。结果表明,该实验方法有效地模拟了圆柱装药的爆破过程。应变波传播过程中伴随着能量转换,其中应变-时间曲线的下降阶段代表爆炸加载对钻孔附近岩石的快速能量输入,而上升阶段反映弹性能量的径向释放,进一步促进了周向裂纹的发展,但能量释放速率低于下降阶段。随着离爆炸中心距离的增加,岩石在爆炸载荷作用下的动弹性模量和应变率均减小,导致应力波和应变波的衰减特性存在差异,应力波服从幂函数衰减。岩石中应力波衰减的复杂性主要受物理衰减特性的支配,在破碎和裂隙区,物理衰减指数大于几何衰减指数。最后,通过分析爆破试样的断裂形貌和裂纹区范围,验证了应力波衰减方程的准确性和实验方法的可靠性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation of blasting stress wave attenuation in sandstone with columnar charging using high-speed DIC technique.

The propagation and attenuation characteristics of blast stress waves in geotechnical media directly influence the fracture behavior of the medium and serve as a crucial basis for optimizing blasting parameter design. To examine the attenuation characteristics of cylindrical blast waves in rocks, the indoor blasting experiments were conducted using sandstone with cylindrical charges. Digital image correlation technology was employed to successfully capture the full-field strain evolution around the borehole during blasting, and the strain-time curves of the rock surrounding the borehole were obtained. To account for the influence of blasting stress wave loading rates on dynamic elastic modulus, Split Hopkinson Pressure Bar tests were performed to establish a precise relationship between dynamic elastic modulus and strain rate. By analyzing the attenuation of the peak strain, a stress wave attenuation equation within the fractured zone was developed, and the stress wave attenuation index was examined. The results indicated that the experimental method effectively simulated the blasting process of cylindrical charges. The strain wave propagation was accompanied by energy transformation, where the descending phase of the strain-time curve represented the rapid energy input to the rock near the borehole due to blast loading, whereas the ascending phase reflected the radial release of elastic energy, further promoting the development of circumferential cracks, albeit at a lower energy release rate than the descending phase. As the distance from the blast center increased, both the dynamic elastic modulus and strain rate of the rock under blast loading decreased, leading to differences between the attenuation characteristics of stress waves and strain waves, with the former following a power function decay. The complex nature of stress wave attenuation in rocks was primarily governed by physical attenuation properties, with the physical attenuation index exceeding the geometric attenuation index in crushed and cracked zones. Finally, the accuracy of the stress wave attenuation equation and the reliability of the experimental method were validated by analyzing the fracture morphology of the blasted specimens and the extent of the cracked zone.

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来源期刊
Scientific Reports
Scientific Reports Natural Science Disciplines-
CiteScore
7.50
自引率
4.30%
发文量
19567
审稿时长
3.9 months
期刊介绍: We publish original research from all areas of the natural sciences, psychology, medicine and engineering. You can learn more about what we publish by browsing our specific scientific subject areas below or explore Scientific Reports by browsing all articles and collections. Scientific Reports has a 2-year impact factor: 4.380 (2021), and is the 6th most-cited journal in the world, with more than 540,000 citations in 2020 (Clarivate Analytics, 2021). •Engineering Engineering covers all aspects of engineering, technology, and applied science. It plays a crucial role in the development of technologies to address some of the world''s biggest challenges, helping to save lives and improve the way we live. •Physical sciences Physical sciences are those academic disciplines that aim to uncover the underlying laws of nature — often written in the language of mathematics. It is a collective term for areas of study including astronomy, chemistry, materials science and physics. •Earth and environmental sciences Earth and environmental sciences cover all aspects of Earth and planetary science and broadly encompass solid Earth processes, surface and atmospheric dynamics, Earth system history, climate and climate change, marine and freshwater systems, and ecology. It also considers the interactions between humans and these systems. •Biological sciences Biological sciences encompass all the divisions of natural sciences examining various aspects of vital processes. The concept includes anatomy, physiology, cell biology, biochemistry and biophysics, and covers all organisms from microorganisms, animals to plants. •Health sciences The health sciences study health, disease and healthcare. This field of study aims to develop knowledge, interventions and technology for use in healthcare to improve the treatment of patients.
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