Experimental study on pressure relief blasting in rock-blast tunnel

Abstract

Rock burst is a difficult and urgent problem during the construction process of underground engineering in a zone with high surrounding rock pressure. Pressure relief blasting is one of the most effective methods for solving the problem. An in-situ blasting test was carried out in a tunnel under excavation, and the geology stress (geo-stress) of the surrounding rock was tested before and after the pressure relief blasting. The experimental results will be effective for further study of the law of pressure relief blasting and rock-burst prediction. An explicit stress analytic function is also employed to analyze the stress distribution of the tunnel surrounding rock after pressure relief blasting based on the propagation of the blasting stress wave. Furthermore, the stress attenuation coefficient and the variation of the geo-stress distribution of surrounding rock under the pressure relief blasting were discussed in detail with the in-situ blasting test data. Highlights. The main contribution of this paper is focused on: 1. This study measures the in-situ geo-stress of surrounding rock in the ‘Sang zhu ling’ tunnel, both before and after the pressure relief blasting. This data is crucial for ensuring the safety resilience of urban infrastructure. 2. A two-dimensional explicit equation of stress attenuation was derived based on the characteristics of stress propagation, providing a more accurate analytical tool for engineers and researchers, 3. The traditionally obtained stress attenuation coefficient is shown to require modification through further in-situ experiments. Future studies will refine this coefficient, contributing to the development of more reliable methods for safeguarding urban lifelines. These contributions align with the journal’s focus on advancing urban science and engineering by promoting innovative, data-driven solutions for urban safety. 

Keywords

Rock-burst / Pressure relief blasting / Stress attenuation / Engineering / Civil Engineering / Resources Engineering and Extractive Metallurgy

References

[1] MengshuW, ZhongshengT. The construct technology of tunnel and underground engineering in China. Eng Sci, 2010, 12: 3-10.

[2] ChuanHe, BoW. Research progress and development trends of highway tunnels in China. Journal of Modern Transportation, 2013, 214209-223.

[3] ChaoY, FangLeP. Discussion on the Development of Underground Utility Tunnels in China. Procedia Engineering, 2016, 165: 540-548.

[4] Xie Heping, Zhang Yanhui, Chen Yiyan, Peng Qi, Liao Zhiyi, Zhu Jianbo, 2021. A case study of development and utilization of urban underground space in Shenzhen and the Guangdong-Hong Kong-Macao Greater Bay Area. Tunnelling and Underground Space Technology. Vol. 107. https://doi.org/10.1016/j.tust.2020.103651.

[5] WeijiaG, YangyangLi, DaweiY, ShichuanZ, XizhenS. Mechanisms of rock burst in hard and thick upper strata and rock-burst controlling technology. Arab J Geosci, 2016, 910561.

[6] ZengqiangY, ChangL, HengzhongZ, FuxingX, LinmingD, JianhangC. Mechanism of rock burst caused by fracture of key strata during irregular working face mining and its prevention methods. Int J Min Sci Technol, 2019, 296889-897.

[7] XintongW, Li ShucaiXu, ZhenhaoXY, JieHu, ZhiqiangLi, BoZ. An interval fuzzy comprehensive assessment method for rock burst in underground caverns and its engineering application. Bull Eng Geol Env, 2019, 7875161-5176.

[8] HadiF. A new empirical chart for rockburst analysis in tunnelling: Tunnel rockburst classification (TRC). Int J Min Sci Technol, 2021, 314603-610.

[9] JianZ, YulinZ, ChuanqiLi, HainiHe, XibingLi. Rockburst prediction and prevention in underground space excavation. Underground Space, 2024, 14: 70-98.

[10] Qi-huQ. Rock burst, Definition, mechanism, classification and quantitative forecast model for rock burst and pressure bump. Rock and Soil Mechanics, 2014, 1: 1-6.

[11] WangL, LuZL, GaoQ. A numerical study of rock burst development and strain energy release. Int J Min Sci Technol, 2012, 225675-680.

[12] XuehuaC, XiaolinD, ZhonghuaLi. Mechanics analysis on the conditions of rock burst occurrence in the coal mass of roadway rib. International Journal of coal science and Technology, 2008, 142213-216.

[13] DouLM, Cai-PingLU, Zong-LongMU, et al. . Prevention and forecasting of rock burst hazards in coal mines. Int J Min Sci Technol, 2009, 195585-591.

[14] SongD, WangE, LiN, et al. . Rock burst prevention based on dissipative structure theory. Int J Min Sci Technol, 2012, 222159-163.

[15] ZangHY, WangGD. Surrounding Rock Stability Analysis and Rock Burst Prediction of Underground Cavity in High in Situ Stress. Advanced Materials Research, 2012, 594–597: 1174-1181.

[16] LiyouP, YankaiN, TiansiK. Prevention and control technology of rock burst in deep stope with complex solid boundary. Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical, 2022, 06: 1124-1132

[17] Dai lianpeng, Pan Yishan, Xiao Yonghui, Wang Aiwen, Wang Wei, Wei Chunchen, Fan Dewei, . Parameter Design Method for Destressing Boreholes to Mitigate Roadway Coal Bursts: Theory and Verification. Rock Mech Rock Eng, 2024, 57: 9539-9556.

[18] Yiping Bai, Rui Zhou, Jiangsong Wu, 2020. Hazard identification and analysis of urban utility tunnels in China. Tunnelling and Underground Space Technology. Vol. 106. https://doi.org/10.1016/j.tust.2020.103584

[19] SinghB, GoelRK, MehrotraVK, et al. . Effect of intermediate principal stress on strength of anisotropic rock mass. Tunneling and underground space technology, 1998, 13: 71-79.

[20] CaiM. Influence of intermediate principal stress on rock fracturing and strength near excavation boundaries insight from numerical modeling. Int J Rock Mech Min Sci, 2008, 452763-770.

[21] Ding Jun Xiao, Li Bin, Jin ChuanPu, Zhou HuiQi, 2013. Model Test and Numerical Simulation for Directional Pressure Relief Blasting. Advanced Materials Research. pp. 779–780, 848–856. https://doi.org/10.4028/www.scientific.net/AMR.779-780.848

[22] JunDCharacteristics of rock dynamics and blasting theory, 2002BeijingMetallurgical Industry Press

[23] DallyJW, ThauSA. Observations of stress wave propagation in a half-plane with boundary loading. Int J Solids Struct, 1967, 33293-300.

Funding

Natural Science Foundation of Sichuan Province(2023NSFSC0046)

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(SKLGP2023Z011)

RIGHTS & PERMISSIONS

The Author(s)