刘帅,王卫华,张恒根,张理维
LIU Shuai,WANG Wei-hua,ZHANG Heng-gen,ZHANG Li-wei

• 1:中南大学资源与安全工程学院

摘要(Abstract)：

为了探究单孔爆破情况下岩石损伤情况，基于ANSYS/LS-DYNA软件，采用RHT材料模型，建立了多组三维数值模型，探究了三维空间下岩石单孔爆破在不同装药长度、不同地应力条件下的损伤情况，并结合自定义变量—有效损伤率来表征岩石在单孔爆破条件下损伤的时空演化规律。结果表明：从孔底到自由面，岩石的损伤逐渐增大，距离炮孔越近，岩石的损伤越严重；随着装药长度的增加，围岩对药卷的空间约束作用也在增强，岩石损伤的增长速率会逐渐减小；地应力在岩石的爆破过程中对岩石损伤具有抑制作用，且岩石损伤会向着地应力最大的方向发展。
In order to explore the rock damage in the case of single hole blasting, based on ANSYS/LS-DYNA software and using RHT material model, establishes several groups of three-dimensional numerical models to explore the rock damage in the three-dimensional space of single hole blasting under the conditions of different charge lengths and different in-situ stresses. Combined with the effective damage rate, the spatiotemporal evolution law of rock damage under the condition of single hole blasting is characterized.The results show that the damage of the rock increases gradually from the bottom of the hole to the free surface, and the closer to the hole, the more serious the damage of the rock is.With the increase of charge length, the spatial constraint effect of surrounding rock on the charge volume is also strengthened, and the growth rate of rock damage will gradually decrease.In the process of rock blasting, the in-situ stress has a restraining effect on the rock damage, and the rock damage will develop towards the direction of the maximum in-situ stress.

关键词(KeyWords)： 岩石损伤;数值模拟;RHT模型;单孔爆破;有效损伤率
rock damage;numerical simulation;RHT model;single hole blasting;effective damage rate

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(41372278)

作者(Author): 刘帅,王卫华,张恒根,张理维
LIU Shuai,WANG Wei-hua,ZHANG Heng-gen,ZHANG Li-wei

DOI: 10.19931/j.EB.20210186

参考文献(References)：

• [1] CHEN E P,TAYLOR L M.Fracture of brittle rock under dynamics loading condition[Z].SAND-84-2583c Sandia National Laboratories,1985.
• [2] KUSZMAUL J S.A new constitutive model for fragmentation of rock under dynamic loading[C]//Second International Symposium on Rock Fragmental by Blasting.Colorado,U.S.A.,1987.
• [3] THORNE B J.A damage model for rock fragmentation and comparison of calculations with blasting experiments in granite[Z].SAND-90-1389 Sandia Natiaonal Laboratories,1991.
• [4] 杨小林，王树仁.岩石爆破损伤及数值模拟[J].煤炭学报，2000,25(1):19-23.YANG X L,WANG S R.Rock blasting damage and numerical simulation[J].Journal of Coal,2000,25(1):19-23.
• [5] 王长柏，李海波，谢冰，等.岩体爆破裂纹扩展影响因素分析[J].煤炭科学技术，2010,38(10):31-34,61.WANG C B,LI H B,XIE B,et al.Analysis of influencing factors of rock mass blasting crack propagation[J].Coal Science and Technology,2010,38(10):31-34,61.
• [6] 黄佑鹏，王志亮，毕程程.岩石爆破损伤范围及损伤分布特征模拟分析[J].水利水运工程学报，2018(5):95-102.HUANG Y P,WANG Z L,BI C C.Simulation analysis of rock blasting damage range and damage distribution characteristics[J].Journal of Water Conservancy and Transport Engineering,2018(5):95-102.
• [7] 潘强，张继春，石洪超，等.单孔不耦合装药爆破的岩体损伤分布特征研究[J].振动与冲击，2019,38(18):264-269.PAN Q,ZHANG J C,SHI H C,et al.Study on damage distribution characteristics of rock mass in single hole uncoupled charge blasting[J].Vibration and Shock,2019,38(18):264-269.
• [8] ZHAO Z Y,ZHANG Y,BAO H R.Tunnel blasting simulations by the Discontinuous Deformation Analysis[J].Internation Journal of Computetional Methods,2011,8(2);277-292.
• [9] 赵建平，程贝贝，卢伟，等.深部高地应力下岩石双孔爆破的损伤规律[J].工程爆破，2020,26(5):14-20,41.ZHAO J P,CEHNG B B,LU W,et al.Damage law of rock double hole blasting under deep high ground stress[J].Engineering Blasting,2020,26(5):14-20,41.
• [10] 杨靖宇，杨军，荣凯.双孔台阶延期爆破效应的数值模拟研究[J].爆破，2021,38(3):67-74.YANG J Y,YANG J,RONG K.Numerical simulation study on delayed blasting effect of double hole bench[J].Blasting,2021,38(3):67-74.
• [11] 江成，甯尤军，武鑫.地应力条件下的凿岩爆破数值模拟[J].工程爆破，2017,23(1):16-20.JIANG C,NING Y J,WU X.Numerical simulation of rock drilling and blasting under in-situ stress[J].Engineering Blasting,2017,23(1):16-20.
• [12] BORRVALL T,RIEDEL W.The RHT concrete model in LS-DYNA[C]//In proceedings of the 8th European LS-DYNA users conference,Strasbourg,2011.
• [13] XIE L X,LU W B,ZHANG Q B,et al.Analysis of damage mechanisms and optimization of cut blasting design under high in-situ stresses[J].Tunnelling and Underground Space Technology,2017,66:19-33.
• [14] JAYASINGHE L B,SHANG J,ZHAO Z,et al.Numerical investigation into the blasting-induced damage characteristics of rocks considering the role of in-situ stresses and discontinuity persistence[J].Computers and Geotechnics,2019,116:1032.07.