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首页> 外文会议>Third International Conference on Discrete Element Methods: Numerical Modeling of Discontinua Sep 23-25, 2002 Santa Fe, New Mexico, USA >Effects of Particle Shape and Size Distribution on Stemming Performance in Blasting
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Effects of Particle Shape and Size Distribution on Stemming Performance in Blasting

机译：颗粒形状和粒度分布对爆破茎粗性能的影响

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摘要

Although the mining and quarrying industries have been using explosives for decades in breaking rock to allow the extraction of minerals, there is still much interest in finding ways to control the use of explosive energy to ensure each application is safe and the utilization of the loaded explosive energy is maximized. Stemming is known to be an effective control as a confinement to prevent the loss of explosive energy into the air through the collar before completing the work done in breaking and heaving the blasted material. An effective stemming should be able to retain an explosion gas pressure on the order of GPa. Stemming is a granular material made from sand or crushed rocks of different shapes and sizes usually passing a one-inch mesh. This paper demonstrates the use of a two-dimensional discrete element method to model the basic characteristics such as packing or density of a stemming material in terms of particle shapes and size distribution. A preliminary setup for the study of the interlocking capability in counteracting the stemming ejection pressure during blasting is also demonstrated. Described in Figure 1 are some sample cluster-shaped bodies of various sizes designed to simulate different shapes of stemming particles. More particles generated from a quadratic equation will be covered in the main paper. The acting forces within the stemming particles as they are set in motion are described below, in Figure 2, in terms of normal elastic and damping forces with adjustable spring and damping coefficients k_n and c_n respectively.
机译：尽管采矿和采石业数十年来一直在使用炸药破坏岩石以允许提取矿物，但仍在寻找方法来控制炸药能量的使用以确保每种应用的安全性和装载炸药的利用仍然引起人们的极大兴趣能量最大化。众所周知，作为一种限制措施，在完成破碎和隆起喷砂材料的工作之前，防止塞环将爆炸能量通过空气泄漏到空中是有效的控制措施。有效的阀杆应能够将爆炸压力保持在GPa量级。茎秆是一种颗粒状材料，由不同形状和大小的沙子或碎石制成，通常经过一英寸的筛网。本文演示了如何使用二维离散元方法对基本特征（例如填充材料的堆积或密度）进行颗粒形状和尺寸分布建模。还展示了用于研究在爆破过程中抵消茎杆喷射压力的互锁能力的初步设置。图1中描述了一些大小各异的样本簇状体，旨在模拟不同形状的发芽颗粒。从二次方程生成的更多粒子将在主要论文中介绍。下面将在图2中根据分别具有可调节弹簧系数和阻尼系数k_n和阻尼系数c_n的法向弹力和阻尼力来描述它们在运动时所产生的作用力。

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