Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress

MA Sizhou; LIU Kewei; YANG Jiacai; LI Xudong; GUO Tengfei

doi:10.11883/bzycj-2023-0151

Volume 43 Issue 10

Oct. 2023

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MA Sizhou, LIU Kewei, YANG Jiacai, LI Xudong, GUO Tengfei. Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress[J]. Explosion And Shock Waves, 2023, 43(10): 105201. doi: 10.11883/bzycj-2023-0151

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MA Sizhou, LIU Kewei, YANG Jiacai, LI Xudong, GUO Tengfei. Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress[J]. Explosion And Shock Waves, 2023, 43(10): 105201. doi: 10.11883/bzycj-2023-0151

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Blast-induced damage characteristics and fracture mechanism of rock mass under initial stress

doi: 10.11883/bzycj-2023-0151

School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China

Received Date: 2023-04-26
Rev Recd Date: 2023-06-26
Publish Date: 2023-10-27

Abstract

Abstract

The technique of drilling and blasting is widely applied in rock excavation, and its working efficiency mainly relies on the rock mass structure and geological conditions. The initial stress plays a crucial role in the blast-induced cracking behavior and failure characteristics, and troubles such as over/underbreak and insufficient fragmentation may be arisen in deep rock masses, leading to other issues related to the waste of mineral resources and production costs. In this paper, the damage features and fracture mechanism of rock blasting under various initial stresses were studied using combined theoretical analysis and numerical simulation. Considering the effect of initial stress on the mechanical response of rock blasting, a theoretical model for single-hole blasting was developed based on elastic mechanics, and then the features of static stress distribution and dynamic pressure evolution were analyzed separately, revealing the fracture mechanism of rock blast-induced damage under initial stress. In addition, the Riedel-Hiermaier-Thoma (RHT) model parameters of rock were determined and adjusted based on a series of empirical formulas as well as dynamic mechanical tests. After calibrating the numerical model against the blasting crack pattern and attenuation of peak pressure by combining test and theoretical results, the single-hole geometric model was created and meshed in the commercial software ANSYS to study the dynamic tangential stress evolution as well as cracking behavior, and the fractal features of rock blasting cracks under different initial stresses were also discussed. The results show that the rationality of the theoretical model can be proved by the numerical simulation: the tangential tensile stress is a critical factor affecting the blasting crack propagation and the rock fragmentation can be improved by adjusting the distribution of hoop stress reasonably when the initial stress is large. In practical engineering, the stress distribution can be changed by controlling the field of geo-stress with presplitting technology.
- initial stress,
- rock blasting,
- theoretical model,
- numerical simulation,
- crack propagation,
- fractal dimension

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References(30)

References

[1]	LI X B, GONG F Q, TAO M, et al. Failure mechanism and coupled static-dynamic loading theory in deep hard rock mining: a review [J]. Journal of Rock Mechanics and Geotechnical Engineering, 2017, 9(4): 767–782. DOI: 10.1016/j.jrmge.2017.04.004.
[2]	杨建华, 孙文彬, 姚池, 等. 高地应力岩体多孔爆破破岩机制 [J]. 爆炸与冲击, 2020, 40(7): 075202. DOI: 10.11883/bzycj-2019-0427. YANG J H, SUN W B, YAO C, et al. Mechanism of rock fragmentation by multi-hole blasting in highly-stressed rock masses [J]. Explosion and Shock Waves, 2020, 40(7): 075202. DOI:10.11883/bayzj-2019-0427. DOI: 10.11883/bzycj-2019-0427.
[3]	朱万成, 唐春安, 左宇军. 深部岩体动态损伤与破裂过程 [M]. 北京: 科学出版社, 2014: 112–121.
[4]	NICHOLLS H R, DUVALL W I. Presplitting rock in the presence of a static stress field [R]. Washington DC: U. S. Department of the Interior, Bureau of Mines, 1966.
[5]	KUTTER H K, FAIRHURST C. On the fracture process in blasting [J]. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1971, 8(3): 181–202. DOI: 10.1016/0148-9062(71)90018-0.
[6]	肖正学, 张志呈, 李端明. 初始应力场对爆破效果的影响 [J]. 煤炭学报, 1996, 21(5): 497–501. DOI: 10.13225/j.cnki.jccs.1996.05.011. XIAO Z X, ZHANG Z C, LI D M. The influence of initial stress field on blasting [J]. Journal of China Coal Society, 1996, 21(5): 497–501. DOI: 10.13225/j.cnki.jccs.1996.05.011.
[7]	刘殿书, 王万富, 杨吕俊, 等. 初始应力条件下爆破机理的动光弹实验研究 [J]. 煤炭学报, 1999, 24(6): 612–614. DOI: 10.13225/j.cnki.jccs.1999.06.012. LIU D S, WANG W F, YANG L J, et al. Holophotoelasticity study on mechanism of blasting under initiative stress field [J]. Journal of China Coal Society, 1999, 24(6): 612–614. DOI: 10.13225/j.cnki.jccs.1999.06.012.
[8]	YANG R S, DING C X, LI Y L, et al. Crack propagation behavior in slit charge blasting under high static stress conditions [J]. International Journal of Rock Mechanics and Mining Sciences, 2019, 119: 117–123. DOI: 10.1016/J.ijrmms.2019.05.002.
[9]	杨仁树, 肖成龙, 丁晨曦, 等. 空孔与运动裂纹相互作用的动焦散线实验研究 [J]. 爆炸与冲击, 2020, 40(5): 052202. DOI: 10.11883/bzycj-2019-0091. YANG R S, XIAO C L, DING C X, et al. Experimental study on dynamic caustics of interaction between void and running crack [J]. Explosion and Shock Waves, 2020, 40(5): 052202. DOI: 10.11883/bzycj-2019-0091.
[10]	岳中文, 田世颖, 张士春, 等. 单向围压作用下切缝药包爆破爆生裂纹扩展规律的研究 [J]. 振动与冲击, 2019, 38(23): 186–195. DOI: 10.13465/j.cnki.jvs.2019.23.027. YUE Z W, TIAN S Y, ZHANG S C, et al. Expanding law of cracks formed by slotted cartridge blast under unidirectional confining pressure [J]. Journal of Vibration and Shock, 2019, 38(23): 186–195. DOI: 10.13465/j.cnki.jvs.2019.23.027.
[11]	YANG L Y, HUANG C, BAO S J, et al. Model experimental study on controlled blasting of slit charge in deep rock mass [J]. Soil Dynamics and Earthquake Engineering, 2020, 138: 106318. DOI: 10.1016/j.soildyn.2020.106318.
[12]	MA G W, AN X M. Numerical simulation of blasting-induced rock fractures [J]. International Journal of Rock Mechanics and Mining Sciences, 2008, 45(6): 966–975. DOI: 10.1016/j.ijrmms.2007.12.002.
[13]	XIE L X, LU W B, ZHANG Q B, et al. Damage evolution mechanisms of rock in deep tunnels induced by cut blasting [J]. Tunnelling and Underground Space Technology, 2016, 58: 257–270. DOI: 10.1016/j.tust.2016.06.004.
[14]	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. DOI: 10.1016/j.tust.2017.03.009.
[15]	LI X D, LIU K W, YANG J C, et al. Numerical study on blast-induced fragmentation in deep rock mass [J]. International Journal of Impact Engineering, 2022, 170: 104367. DOI: 10.1016/j.ijimpeng.2022.104367.
[16]	LI X D, LIU K W, SHA Y Y, et al. Numerical investigation on rock fragmentation under decoupled charge blasting [J]. Computers and Geotechnics, 2023, 157: 105312. DOI: 10.1016/j.compgeo.2023.105312.
[17]	KIRSCH G. Die theorie der elastizitat und die bedurfnisse der festigkeitslehre [J]. Zantralblatt Verlin Deutscher Ingenieure, 1898, 42: 797–807.
[18]	MIKLOWITZ J, KAUL R K. The theory of elastic waves and waveguides [J]. Journal of Applied Mechanics, 1979, 46(4): 969. DOI: 10.1115/1.3424709.
[19]	YI C P, JOHANSSON D, GREBERG J. Effects of in-situ stresses on the fracturing of rock by blasting [J]. Computers and Geotechnics, 2018, 104: 321–330. DOI: 10.1016/j.compgeo.2017.12.004.
[20]	TAO J, YANG X G, LI H T, et al. Effects of in-situ stresses on dynamic rock responses under blast loading [J]. Mechanics of Materials, 2020, 145: 103374. DOI: 10.1016/j.mechmat.2020.103374.
[21]	LI X H, ZHU Z M, WANG M, et al. Numerical study on the behavior of blasting in deep rock masses [J]. Tunnelling and Underground Space Technology, 2021, 113: 103968. DOI: 10.1016/j.tust.2021.103968.
[22]	WANG Z L, WANG H C, WANG J G, et al. Finite element analyses of constitutive models performance in the simulation of blast-induced rock cracks [J]. Computers and Geotechnics, 2021, 135: 104172. DOI: 10.1016/j.compgeo.2021.104172.
[23]	俞茂宏. 双剪理论及其应用 [M]. 北京: 科学出版社, 1998: 849–860.
[24]	BORRVALL T, SWEDEN L, RIEDEL W. The RHT concrete model in LS-DYNA [C]// Proceedings of the 8th European LS-DYNA Conference. Strasbourg, France, 2011.
[25]	李洪超, 陈勇, 刘殿书, 等. 岩石RHT模型主要参数敏感性及确定方法研究 [J]. 北京理工大学学报, 2018, 38(8): 779–785. DOI: 10.15918/j.tbit1001-0645.2018.08.002. LI H C, CHEN Y, LIU D S, et al. Sensitivity analysis determination and optimization of rock RHT parameters [J]. Transactions of Beijing Institute of Technology, 2018, 38(8): 779–785. DOI: 10.15918/j.tbit1001-0645.2018.08.002.
[26]	MA S Z, LIU K W, GUO T F, et al. Experimental and numerical investigation on the mechanical characteristics and failure mechanism of cracked coal & rock-like combined sample under uniaxial compression [J]. Theoretical and Applied Fracture Mechanics, 2022, 122: 103583. DOI: 10.1016/j.tafmec.2022.103583.
[27]	BANADAKI M M D, MOHANTY B. Numerical simulation of stress wave induced fractures in rock [J]. International Journal of Impact Engineering, 2012, 40/41: 16–25. DOI: 10.1016/j.ijimpeng.2011.08.010.
[28]	YANG J C, LIU K W, LI X D, et al. Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress [J]. Journal of Central South University, 2020, 27(10): 3149–3162. DOI: 10.1007/s11771-020-4535-3.
[29]	谢和平, 高峰, 周宏伟, 等. 岩石断裂和破碎的分形研究 [J]. 防灾减灾工程学报, 2003, 23(4): 1–9. DOI: 10.3969/j.issn.1672-2132.2003.04.001. XIE H P, GAO F, ZHOU H W, et al. Fractal fracture and fragmentation in rocks [J]. Journal of Disaster Prevention and Mitigation Engineering, 2003, 23(4): 1–9. DOI: 10.3969/j.issn.1672-2132.2003.04.001.
[30]	DING C X, YANG R S, YANG L Y. Experimental results of blast-induced cracking fractal characteristics and propagation behavior in deep rock mass [J]. International Journal of Rock Mechanics and Mining Sciences, 2021, 142: 104772. DOI: 10.1016/J.ijrmms.2021.104772.