ABSTRACT

In the bench blasting, rock mass will be fragmented and thrown under the explosion energy. Usually, the movement of the rock fragmentation is of the same importance as the blast fragmentation. The muckpile shape is a manifestation and outcome of the rock fragmentation movement, which is not well interpreted yet. Most existing methods for the rock fragmentation movement are force-based, which are computer time-consuming. In this study, a position-based dynamics (PBD) method is extended to simulate the rock fragmentation movement in production blasting by describing rock mass displacement in a rigid-body dynamics framework. The proposed model discretises the whole rock mass volume into small irregularly shaped blocks using a Voronoi algorithm, and the velocity based on blast energy is assigned to each block. Then, the movement, collision and landing of the blocks are simulated with PBD method. A simulation example of a practical bench blasting case is carried out to validate the PBD method. The movement of the rock fragmentation to form the final muckpile is reproduced and analysed.

抽象的

在台架爆破中，岩体将碎裂并在爆炸能量作用下抛掷。通常，碎石运动与爆炸碎裂具有同样重要的意义。堆状形状是岩石破碎运动的表现和结果，目前尚不能很好地解释。大多数现有的碎石运动方法都是基于力的，这很费时间。在这项研究中，通过描述刚体动力学框架中的岩体位移，扩展了基于位置的动力学（PBD）方法来模拟生产爆破中的岩石破碎运动。提出的模型使用Voronoi算法将整个岩体体积离散为不规则形状的小块，并将基于爆炸能量的速度分配给每个块。然后，运动 用PBD方法模拟了块体的碰撞和着陆。进行了一个实际的台式喷砂工况的仿真示例，以验证PBD方法的有效性。再现并分析了岩石碎裂运动，形成了最终的泥堆。