两孔间导向孔对爆炸裂纹扩展方向控制的数值模拟  

Numerical Simulation of Double-hole Crack Control by Guide Hole Under Explosion Load

作　　者：缪广红 孙文翔 张旭 孙伟波 MIAO Guanghong;SUN Wenxiang;ZHANG Xu;SUN Weibo(School of Mechanics and Optoelectronics Physics,Anhui University of Science and Technology,Huainan 232001,Anhui,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学力学与光电物理学院,安徽淮南232001 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《黄金科学技术》2025年第1期139-148,共10页Gold Science and Technology

基　　金：国家自然科学基金项目“基于蜂窝结构炸药低能高效爆炸焊接的关键参数控制理论与爆轰机理研究”(编号:11902003)资助。

摘　　要：为了研究导向孔控制爆破裂纹扩展方向的作用机理,以有机玻璃(PMMA)作为爆炸介质,采用ANSYS/LS-DYNA软件,分别对两孔之间无导向孔、有圆形导向孔和带切槽导向孔的爆破裂纹扩展进行了二维数值模拟研究,对比分析了3种情况下两孔之间爆破裂纹的扩展方向和贯通情况,研究了各导向孔孔壁上测点的应力时程曲线变化情况。结果表明:带切槽导向孔与炮孔间距为12.5 cm、15.0 cm和17.5 cm时裂纹均实现了贯通,圆形导向孔与炮孔间距为12.5 cm时裂纹实现了贯通,无导向孔时两侧炮孔的裂纹均呈现为一上一下错开的趋势;带切槽导向孔两侧的应力明显大于圆形孔,在裂纹扩展上有更强的导向作用。数值模拟结果与试验结果相吻合,切槽导向孔有更好的导向效果;在控制岩体定向断裂的实际工程中,可以在炮孔之间设置切槽导向孔,有利于引导裂纹的延伸。The formulation of blasting plans frequently necessitates consulting the experiences of similar projects to enhance the execution of blasting operations.However,the application of blasting techniques in excavation activities is frequently accompanied by challenges such as rock damage,over-excavation,and under-excavation.These issues can compromise the stability of the rock mass,consequently impacting the overall safety and reliability of the project.A widely adopted technique for effectively managing the directional propagation of cracks during blasting operations,thereby ensuring the desired blasting outcome,involves the strategic placement of guide holes surrounding the blast hole.To further investigate the variations in the guiding efficacy of different types of guide holes,this study employs the*MAT_JOHNSON_HOLMQUIST_CERAMICS constitutive model within the LS-DYNA software for simulation,building upon prior research.The objective of this model is to forecast the mechanical behavior of brittle materials,including ceramics and polymethyl methacrylate,under extreme conditions such as high strain rates,elevated pressures,and impact loads.This model facilitates the analysis of crack propagation effects in polymethyl methacrylate plates subjected to explosive loads,specifically examining the influence of varying guide hole configurations.Additionally,it enables a more in-depth investigation into the guiding effect on crack propagation by altering the spacing between blast holes and guide holes.This study investigates the influence of various guide hole configurations on crack propagation control by analyzing the morphological differences of blasting cracks and examining the temporal stress history curves at multiple measurement points on the walls of different guide holes.The findings indicate that polymethyl methacrylate with guide holes facilitates crack penetration more effectively than those without,with grooved guide holes demonstrating superior penetration efficacy compared to circular guide holes.A detailed e

关 键 词：爆破损伤 裂纹扩展 贯穿机制 导向孔 有机玻璃 数值模拟 

分 类 号：TD235[矿业工程—矿井建设]