坚硬岩体双孔预裂爆破裂隙发育与弱化机理研究

Research on Twohole Pre-splitting Blasting Weakening Mechanism of Hard Roof

基于ANSYS/LS-DYNA显式动力学有限元软件,对岩体在双孔爆破荷载作用下的动力响应机理及裂隙发育规律做了较系统深入的分析。研究结果表明:爆破孔中间区域出现沿爆破孔连线中垂线方向发育的贯通裂隙,岩体有效应力迅速增大,爆破孔间岩体一定区域内裂隙二次发育,岩体的损伤破碎程度增加。

Based on ANSYS/LS-DYNA explicit dynamic finite element software,have done more in depth analysis to dynamic rock blasting holes in the load response mechanism and fractured system of law. The results showed： blasting holes in the middle zone appear along the vertical direction of the blast hole connection through the development of cracks, the effective stress of rock increases rapidly and the development of secondary blast holes happened in a certain area between rock fractures leads to the degree of damage of broken rock increasing