用有限元法研究爆破对不同质量石灰石的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.2.111
L. Dimitraki, B. Christaras, Nikolas Arampelos
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引用次数: 1

摘要

为了开采集料,在炸药的动载荷作用下,采石场岩体内部发生了较大的变形和快速的压力传播。岩石爆破科学的复杂性是由于影响该现象的许多因素造成的。然而,爆破工程计算可以通过创新的软件算法来促进,以便确定剧烈爆炸的结果,因为现场实验特别难以进行。为了详细研究硝酸铵燃料油(ANFO)爆破作用下石灰石的性能,本文设计了一套有限元分析程序。具体来说,本文给出了有限元模型和相关的瞬态分析结果,模拟了三种石灰石的爆破过程,从差到很好。采用Jones-Wilkins-Lee (JWL)状态方程来描述ANFO的热力学状态,采用压力相关的Drucker-Prager破坏准则来定义爆破诱发的高速率应力下石灰石的塑性行为,开发了有限元程序。为了定义材料的刚度退化和破坏,还使用了递进损伤模型。本文对三种石灰石的压力、应力分布和能量平衡现象进行了比较分析和量化。本研究的最终目标是利用先进的计算工具,考虑到爆炸事件中发生的各种现象,为一系列科学问题提供答案。
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Investigation of blasting impact on limestone of varying quality using FEA
Large deformation and rapid pressure propagation take place inside the rock mass under the dynamic loads caused by the explosives, on quarry faces in order to extract aggregate material. The complexity of the science of rock blasting is due to a number of factors that affect the phenomenon. However, blasting engineering computations could be facilitated by innovative software algorithms in order to determine the results of the violent explosion, since field experiments are particularly difficult to be conducted. The present research focuses on the design of a Finite Element Analysis (FEA) code, for investigating in detail the behavior of limestone under the blasting effect of Ammonium Nitrate & Fuel Oil (ANFO). Specifically, the manuscript presents the FEA models and the relevant transient analysis results, simulating the blasting process for three types of limestone, ranging from poor to very good quality. The Finite Element code was developed by applying the Jones-Wilkins-Lee (JWL) equation of state to describe the thermodynamic state of ANFO and the pressure dependent Drucker-Prager failure criterion to define the limestone plasticity behavior, under blasting induced, high rate stress. A progressive damage model was also used in order to define the stiffness degradation and destruction of the material. This paper performs a comparative analysis and quantifies the phenomena regarding pressure, stress distribution and energy balance, for three types of limestone. The ultimate goal of this research is to provide an answer for a number of scientific questions, considering various phenomena taking place during the explosion event, using advanced computational tools.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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