预裂爆破成缝机理的数值模拟研究

为了进一步验证数值模拟技术在预裂爆破工程中的实用性,以云南省布沼坝矿西帮边坡为例,通过ANSYS/LS-DYNA软件对不同爆破参数条件下的预裂缝形成过程进行模拟。研究结果表明,预裂缝裂隙是先从孔壁开始形成并向中点发展,而不是应力波干涉理论认为的裂缝首先从中点产生,并向两孔发展。同时将数值模拟计算中得到的预裂缝效果较好的几组爆破参数分别应用于现场试验中,预裂爆破效果明显。可见,数值模拟技术的恰当运用,将为预裂爆破理论研究和参数的合理确定提供一条有效途径,也为爆破方案优化提供可行性依据。

Numerical simulation analysis on mechanism of the crack formation induced by pre-split blasting

In order to validate the practicability of numerical simulation technology in pre-split blasting engineering, taking west slope of Buzhaoba coal mine in YunNan province as an example. The cracking of pre-split blasting is simulated through ANSYS/LS-DYNA software under the condition of different blasting parameters. As we can see, the cracking of pre-split blasting begins from the hole wall and develops to the middle, rather than the stress wave interference theory confirms that the crack is firstly formed in the middle, and then to the two holes. At the same time, choosing those groups of blasting parameters which make the cracking of pre-split blasting better, respectively applied them to the field test, the pre-split blasting effect is obvious. Visiblely, proper using of numerical simulation technology will provide an effective way on the research of pre-split blasting theory and reasonable determine blasting parameters. Also provide a feasible basis for blasting scheme optimization of west slope of Buzhaoba coal mine in the future.