According to the energy change of deep-buried marble in Jin-ping Ⅱ Hydropower Station under drilling blasting method and TBM excavation, a numerical model was proposed to discuss the relationship between the potential occurring range of rock burst and the mechanical characteristics of surrounding rock. The effects of the brittleness and strength of rock mass were studied. Besides, the results of numerical simulation were analysed and verified through the rock burst monitoring data of the diversion tunnel in Jin-ping Ⅱ Hydropower Station. The research shows that the disturbance of surrounding rock is small during TBM excavation and the stored energy near the excavation face is higher. As the thickness of the brittle rock is small, the rock burst grade may be rather lower. The burst depth is generally in the range of 0—1.0 m，and mostly less than 0.5 m. For blasting excavation, the strain energy of surrounding rock releases in a transient state, which reduces the energy source of rock burst, but owing that the thickness of the brittle rock is small, the burst depth is generally 2.0 m, and high-level rock bursts may more happen.
Key words
rock mechanics /
energy storage limitation /
drilling and blasting excavation /
TBM excavation /
rock burst grade
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 孙金山, 金李, 姜清辉,等. 地下洞室爆破开挖过程中地应力瞬态调整诱发节理围岩松动机制研究[J]. 振动与冲击, 2011, 30(12):28-34.
SUN Jin-shan, JIN Lin, JIANG Qing-hui et al. Loosing mechanism of jointed rock mass induced by transient adjustment of in-situ stress[J]. Journal of vibration and shock, 2011, 30(12): 28-34.
[2] 尚雪义, 李夕兵, 彭康,等. FSWT-SVD模型在岩体微震信号特征提取中的应用[J]. 振动与冲击, 2017, 36(14):52-60.
SHANG Xue-yi, LI Xi-bing, PENG Kang et al. Application of FSWT-SVD model in the feature extraction of rock mass microseismic signals[J]. Journal of vibration and shock, 2017, 36(14): 52-60.
[3] 唐春安, 王思敬, 杨志法, 等. 岩石的破裂, 失稳及岩爆[J]. 中国岩石力学与工程世纪成就. 南京: 河海大学出版社, 2004: 324–335.
TANG Chun’an, WANG Si-jing, YANG Zhi-fa, et al. Instability and rockburst of rocks[J]. Centurial Achievement of Rock Mechanics and Engineering in China. Nanjing： Hohai University Press，2004：324–335.
[4] Read R S. 20 years of excavation response studies at AECL's Underground Research Laboratory[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(8): 1251-1275.
[5] Kaiser P K, Cai M. Design of rock support system under rockburst condition[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2012, 4(3): 215-227.
[6] 陈炳瑞，冯夏庭，明华军，等. 深埋隧洞岩爆孕育规律与机制：时滞型岩爆[J]. 岩石力学与工程学报，2012，31(3)：561–569.
CHEN Bing-rui，FENG Xia-ting，MING Hua-jun，et al. Evolution law and mechanism of rockbursts in deep tunnels：time delayed rockbursts[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(3)：561–569.
[7] 陈庆, 郑颖人, 陈剑杰. 花岗岩隧道地震响应机理及减震技术探析[J]. 振动与冲击, 2013, 32(10):149-156.
CHEN Qing, ZHENG Ying-ren, CHEN Jin-jie. Analysis of seismic responses of granite tunnel under earthquake effect and related aseismic measures[J]. Journal of vibration and shock, 2013, 32(10): 149-156.
[8] 陈卫忠，吕森鹏，郭小红，等. 基于能量原理的卸围压试验与岩爆判据研究[J]. 岩石力学与工程学报，2009，28(8)：1 530–1 540.
CHEN Wei-zhong，LU Sen-peng，GUO Xiao-hong，et al. Research on unloading confining pressure tests and rockburst criterion based on energy theory[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 530–1 540.
[9] 谢和平. 岩爆的分形特征及机制[J]. 岩石力学与工程学报，1993，12(1)：28–37.
XIE He-ping. Fractal characteristics and mechanism of rocks[J]. Chinese Journal of Rock Mechanics and Engineering，1993，12(1)：28–37.
[10] 王元汉，李卧东，李启光，等. 岩爆预测的模糊数学综合评判方法[J]. 岩石力学与工程学报，1998，17(5)：493–501.
WANG Yuan-han，LI Wo-dong，LI Qi-guang，et al. Method of fuzzy comprehensive evaluations for rockburst prediction[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(5)：493–501.
[11] 潘一山，章梦涛，李国臻. 洞室岩爆的尖角型突变模型[J]. 应用数学和力学，1994，15(10)：893–990.
PAN Yi-shan，ZHANG Meng-tao， LI Guo-zheng. The study of chamber rockburst by the CUSP model of catastrophe theory[J]. Applied Mathematics and Mechanics，1994， 15(10)：893–990.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(2004 KB)
