采矿与安全工程学报Issue(1)：172-178,7.DOI:10.13545/j.cnki.jmse.2016.01.027
屈曲型岩爆的发生机制及其时效性研究
Occurrence mechanism and time-dependency effect of buckling rock burst
摘要
Abstract
To analyze the formation mechanism of slabbing thin plate in surrounding rock and the me-chanical mechanism of bulking rock burst, the differentiation law of principle stresses during the deep roadway excavation was studied by numerical simulation. Based on three-parameter viscoelasticity con-stitutive relationship and the slabbing thin plate mechanical model for buckling rock burst, the buckling time-dependency equation of buckling rock burst under two dimensional stress state was theoretically de-rived, and the time-dependency features of bulking rock burst under different stress states were discussed. Simulated results indicate that for the roadway where vertical geo-stress is greater than horizontal geo-stress, the principle stresses decrease and the rock energy releases gradually in the roof and floor with the excavation process, while the principle stresses in sidewalls appear to be largely different, the tangential stress increases while the axial stress decreases in sidewalls where the rock mass energy accu-mulates massively. On the contrary, for the roadway where horizontal geo-stress is greater than vertical geo-stress, the differentiation evolution process of stresses and the characteristics of energy accumula tionare the opposite. The results illustrate the mechanism of delayed rock burst, that is, when the slab-bing thin plate structure in surrounding rock forms, the thin plate starts to bend and creep under the ac-tion of two-dimensional stress state, after the deformations reach to a limited value in a period of time, the slabbing thin plate structure will bulking fail and release massive elastic strain energy simultaneous-ly.关键词
屈曲型岩爆/应力分异/层裂板结构/延迟效应/弯曲蠕变Key words
buckling rock burst/stress differentiation/slabbing plate structure/time delayed effect/bending creep分类
建筑与水利引用本文复制引用
翁磊,李夕兵,周子龙,刘科伟..屈曲型岩爆的发生机制及其时效性研究[J].采矿与安全工程学报,2016,(1):172-178,7.基金项目
国家自然科学基金项目(41272304)；国家重点基础研究发展计划(973)项目(2010CB732004)；中央高校基本科研业务费专项资金项目(2014zzts057) （41272304）
