利用不同截面形状的炸药进行固体介质破裂的物理和仿真模拟

IF 2.8 Q2 MINING & MINERAL PROCESSING Mining of Mineral Deposits Pub Date : 2022-12-30 DOI:10.33271/mining16.04.122
O. Ishchenko, V. Konoval, K. Ishchenko
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引用次数: 0

摘要

目的是在实验和理论上评价炸药在不同截面形状下造成固体介质破裂的机理。方法。采用莫尔-库仑强度条件来描述岩石向扰动状态的转变。该条件为建立集中钻孔装药的爆炸(即激波和爆震波)数学模型奠定了基础。在圆柱形装药轮廓点和三角形和方棱形装药角处分别施加足够的载荷,模拟了模拟爆炸。采用旋光性材料模型对形状变化的炸药致裂固体介质的机理进行了评价。介绍了一种高速照相记录该过程的方法;该方法与应力分析的光弹性技术相结合。发现。考虑岩石向扰动状态的过渡,采用莫尔-库仑强度条件,根据所建立的数学模型可以模拟剪切和分离破坏。计算结果有助于识别地质力学参数Q在不同时间点(时间迭代)的分布。得到了主应力张量σ1 / γН的最大分量在不同时间迭代下沿垂直于电荷中心的轴线变化的依赖关系。已经确定,最大应力集中在三角形和方形棱镜的顶部,有助于在区域内形成更密集的裂纹网络。创意。结果表明,在爆炸初始阶段,主应力张量分量σ1 / γН沿垂直于表面穿过装药中心轴线方向的最大值,随着距装药轮廓距离的增加,呈幂律变化。同时,当电荷为方棱柱形时,时间迭代i = 5使主应力呈线性递减关系。实际意义。研究结果可为建筑材料开采露天矿分离复杂硬岩节约型方法的合理参数制定提供依据。
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Physical and simulation modelling of solid media fracturing by means of explosive charges of different cross-sectional shapes
Purpose is to evaluate experimentally and theoretically a mechanism of solid media fracturing by means of explosive charges varying in their cross-sectional shapes. Methods. The Mohr-Coulomb strength condition has been applied to describe rock transition to the disturbed state. The condition has become a basis to develop a mathematical model of explosion (i.e. shock and detonation wave) of the concentrated borehole charges. The simulation explosion was modelled while adequate load applying at the points belonging to the outline of both cylindrical charge and at the charging angles in the shapes of triangular and square prisms. The evaluation mechanism of solid media fracturing by means of explosive charges, varying in their shapes, used the models made of optically active materials. A method of high-speed photorecording of the process was involved; the method was combined with the photoelastic technique of stress analysis. Findings. Taking into consideration rock transition to the disturbed state, the Mohr-Coulomb strength condition was applied with the possibility to simulate failures resulting from shear as well as from separation according to the developed mathematical model. The calculation results have helped identify distribution of a geomechanical parameter (Q) at different time points (time iterations). Dependencies of changes in the maximum component of the main stress tensor σ1 / γН along the axis passing through the charge centres perpendicularly to its flat surface for different time iterations have been developed. It has been defined that the maximal stresses are concentrated on the top of both triangular and square prisms helping shape a denser crack network within the zones. Originality. It has been identified that at the initial explosion stage, the maximum values of the main stress tensor component σ1 / γН along the axis passing through the charge centre perpendicularly to its flat surface, experience certain change depending upon a power law with the increasing distance to the charge outline. At the same time, if the charge is of a square prism shape then time iteration being i = 5 makes the main stress decrease according to a linear dependence. Practical implications. The research may be used as the basis for the development of rational parameters of the resource-saving methods applied to separate hard complex rocks in terms of open pits where building materials are mined.
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来源期刊
Mining of Mineral Deposits
Mining of Mineral Deposits MINING & MINERAL PROCESSING-
CiteScore
5.20
自引率
15.80%
发文量
52
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