摘要
根据岩爆孕育及发生过程中围岩变形量的自相似特征,提出了一种时间分形计算方法.基于该方法,针对某水电站深埋引水隧洞施工过程中大量不同等级即时型的岩爆典型案例,进行岩爆过程围岩变形量的时间分形研究,结果表明:深部岩体隧洞岩爆过程中围岩变形量在时间上具有分形结构,并且表现出很好的自相似特征;依据围岩变形量时间分形维数可以对即时性岩爆进行等级划分,强烈岩爆分形维数均大于1.8,中等岩爆分形维数在1.5~1.8内,轻微岩爆分形维数小于1.5;在岩爆孕育及发生过程中,每一日的变形量时间分形维数随着岩爆孕育过程不断增加,当岩爆发生时达到最大值.上述研究结果可以为高地应力条件下深埋硬岩隧洞施工过程中岩爆灾害的预测与防治提供合理的科学依据.
According to the self-similarity of the deformation, a time fractal calculation method was put forward to study the fractal behavior of the deformation of the surrounding rock, during the evo lution of different intensities of immediate rockbursts in the deeply-buried tunnels of a hydropower station. Results show that the time distribution of the deformation during the evolution of immediate rockbursts displays fractal structure. The deformation time fractal dimensions value can be used as a basis for estimating rockburst intensity： time fractal dimensions〉1. 8, 1.5-1.8 and 〈1.5 are corre sponding to intense rockbursts, moderate rockbursts, and slight rockbursts. The daily time fractal dimensions of the deformation increases as approach of the immediate rockbursts. The result can be used as a guideline to develop a warning system and reduce the risk of rockbursts during construction.
作者
于洋
耿大新
童立红
朱陈
Yu Yang Geng Daxin Tong Lihong Zhu Chen(Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnieal Engineering, East China Jiaotong University, Nanehang 330013, China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第7期36-40,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51509092)
江西省自然科学基金资助项目(20161BAB216141)
江西省教育厅科研资助项目(150518)
关键词
深埋隧道
围岩
变形量
岩爆
分形维数
deeply-buried tunnel
surrounding rock
deformation
rockburst
fractal dimension
