不同耦合介质台阶爆破中岩体破碎特性研究

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-02 DOI:10.3389/feart.2024.1445990

Tong Li, Ming Chen, Bo-wen Guo, Li Song, Bing Fan, Shan-shan Cui

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引用次数: 0

摘要

破碎粒度分布是评价爆破效果的重要指标。基于应力波理论，建立了爆破破碎粒度分布模型，明确了关键影响因素。然后，通过数值模拟和现场试验，对比验证了水耦合爆破和气耦合爆破的岩石破碎分布特征。结果表明，在确定爆破岩石时，岩石爆破破碎尺寸与钻孔压力和单位炸药消耗量呈负相关。水的存在减缓了爆破载荷的衰减，延长了持续时间，使传递到孔壁的爆破压力明显大于空气耦合压力，相当于增加了单位炸药消耗量。此外，水耦合爆破的岩石裂隙发育速度和破碎程度明显高于空气耦合爆破。综合判定在相同装药参数下，水耦合爆破较空气耦合爆破能提高岩石破碎程度，爆破后岩石平均粒径更小，粒径分布更均匀。该研究成果对于爆破控制和优化炸药能量利用具有重要的参考意义。

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Study on fragmentation characteristics of rock mass in bench blasting with different coupling media

The fragmentation size distribution is an important index to evaluate blasting effect. Based on stress wave theory, a blasting fragmentation distribution model is established, and the key influencing factors were clarified. Then, the distribution characteristics of rock fragmentation in water-coupled blasting and air-coupled blasting were compared and verified by numerical simulation and field test. The results show that the rock blasting fragmentation size is negatively correlated with borehole pressure and unit explosive consumption when blasting rock is determined. The existence of water slows down the attenuation of blasting load, prolongs the duration, and makes the blasting pressure transmitted to hole wall significantly greater than air-coupled one, which is equivalent to increasing the unit explosive consumption. Moreover, the rock fracture development speed and fragmentation degree of water-coupled blasting is significantly higher than air-coupled blasting. Comprehensively determined in same charging parameters, water-coupled blasting compared with air-coupled blasting can improve the degree of rock fragmentation, the average size of rock after blasting is smaller, more uniform particle size distribution. The research results for the control of blasting and optimization of explosive energy utilization have important reference significance.

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.