基于ANSYS/LS-DYNA的岩石爆破结构数值模拟分析

Numerical simulation analysis of rock blasting structure based on ANSYS/LS-DYNA

摘要:

等离子爆破技术是一种新型爆破技术，其爆破孔的设计对整个爆破效果及爆破效率起着决定性的作用。本文基于ANSYS/LS-DYNA建立了爆破孔的有限元模型，并对爆炸荷载作用下掏槽孔孔壁压力及其破碎区进行了数值模拟。研究结果表明，爆破时畸变能的变化自始至终都基本呈椭圆形，孔径越小，积累的能量越大，对岩体破坏越大；孔深长度越短，能量积聚空间越小，爆破对岩体造成的破坏越大；孔深长度的改变对下部岩体影响较小，对中部岩体影响较大。此外由于爆炸实验多为破坏性实验，很难进行原型试验，因此使用数值模拟方法研究爆破孔的结构是可行的，可以作为实际工程的参考。

Abstract:

Plasma blasting technology is a new type of blasting technology. The design of blasting holes plays a decisive role in the overall blasting effect and blasting efficiency. In this paper, the finite element model is established for the blasting hole based on ANSYS/LS-DYNA. The numerical simulation of the wall pressure and the fracture zone of the undercut holes under blasting loads is carried out. The results show that the distortion energy changes during blasting from beginning to end. It is basically elliptical; and the smaller the aperture, the larger the accumulated energy, and the greater the damage to the rock mass; the shorter the hole depth, the smaller the energy accumulation space, and the greater the damage caused by the blasting to the rock mass; The hole depth has less impact on the lower rock mass and has greater impact on the middle rock mass. In addition, since the explosion experiment is mostly a destructive one, it is difficult to carry out the prototype test. Therefore, it is feasible to use the numerical simulation method to study the structure of the blasthole, which can be used as a reference for field work.