深部岩体隧洞即时型岩爆微震震源体积的分形特征研究

发布时间：2018-03-10 02:08

本文选题：即时型岩爆　切入点：水电站　出处：《岩土工程学报》2017年12期 　论文类型：期刊论文

【摘要】：根据即时型岩爆孕育及发生过程中微震信息的自相似性,提出了一种震源体积的分形计算方法。运用上述方法,基于锦屏二级水电站施工排水洞及4条引水隧洞施工过程中的大量不同类型、等级的即时型岩爆案例,展开微震事件震源体积分布的分形行为研究。研究结果表明:即时型岩爆孕育及发生过程中的微震信息震源体积分布是具有分形结构的;即时性应变型岩爆体积分形维数大于0.7,即时性应变结构面滑移型岩爆体积分形维数小于0.6,这意味着根据微震事件体积分形维数可以对即时性岩爆的类型进行区分;对于即时型岩爆来说,岩爆等级越强则微震体积分形维数值越大;对于即时性应变结构面滑移型岩爆,结构面数越多则震源体积分形维数值越小。上述研究结果可以为高地应力条件下不同类型岩爆的预测与防治提供合理的科学依据。
[Abstract]:According to the self-similarity of microseismic information during the preparation and occurrence of instant rockburst, a fractal calculation method of source volume is proposed. Based on a large number of real time rockburst cases of different types and grades in the construction of drainage tunnels and four diversion tunnels in Jinping II Hydropower Station, The fractal behavior of focal volume distribution of microseismic events is studied. The results show that the volume distribution of microseismic source information during the preparation and occurrence of instant rockburst has fractal structure. The integral dimension of instant strain rockburst is greater than 0.7 and the integral dimension of instant strain plane slip rockburst is less than 0.6, which means that the type of instant rockburst can be distinguished according to the fractal dimension of microseismic event volume. For instant rockburst, the stronger the grade of rockburst is, the larger the fractal dimension of microseismic volume is, and for the sliding rockburst of instant strain structure plane, The larger the number of structural planes, the smaller the fractal dimension of focal volume. The above results can provide a reasonable scientific basis for prediction and prevention of different types of rockburst under high ground stress.
【作者单位】：华东交通大学江西省岩土工程基础设施安全与控制重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金项目(51509092) 江西省自然科学基金项目(20161BAB216141,2016BAB206159) 江西省教育厅科研项目(150518) 岩土力学与工程国家重点实验室开放基金项目(Z015004)
【分类号】：TV554

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