深埋隧洞不同开挖方式下即时型岩爆微震信息特征及能量分形研究

›› 2013, Vol. 34 ›› Issue (9): 2622-2628.

深埋隧洞不同开挖方式下即时型岩爆微震信息特征及能量分形研究

于洋¹，冯夏庭^{1, 2}，陈炳瑞²，肖亚勋²，丰光亮²，李清鹏²

1. 东北大学深部金属矿山安全开采教育部重点实验室，沈阳 110819； 2. 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，武汉 430071

收稿日期:2013-04-28 出版日期:2013-09-11 发布日期:2013-09-13
作者简介:于洋，男，1982年生，博士研究生，主要从事深部岩体力学方面的研究工作
基金资助:
国家重点基础研究发展规划(973)项目(No. 2010CB732006)。

Analysis of energy fractal and microseismic information characteristics about immediate rockbursts in deep tunnels with different excavation methods

YU Yang¹，FENG Xia-ting^{1, 2}，CHEN Bing-rui²，XIAO Ya-xun²，FENG Guang-liang²，LI Qing-peng²

1. Key Laboratory of Ministry of Education for Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

Received:2013-04-28 Online:2013-09-11 Published:2013-09-13

摘要/Abstract

摘要： 基于锦屏二级水电站深埋隧洞钻爆法及隧道掘进机（TBM）开挖过程中大量微震监测数据及不同等级的岩爆案例，对不同开挖方式下即时型岩爆的孕育及发生过程的能量释放展开研究，并运用分形几何原理研究微震能量分布的变化规律，得到以下结论：（1）即时型岩爆的孕育及发生过程中，岩爆区围岩岩体处于破坏加速集聚并不断扩展的过程；（2）钻爆法开挖过程中储存在岩体内的弹性应变能消耗于岩体破裂过程大于TBM开挖，而转化为岩体动能小于TBM开挖；（3）钻爆法开挖微震能量分形维度在即时型岩爆的孕育过程不断增加，岩爆临近前会增加到某个临界值以上；（4）TBM开挖即时型高等级岩爆能量分形维度值大于钻爆法开挖，并且其分形维度值可以反映低等级岩爆伴随发生的特征。

关键词: 钻爆法, 即时型岩爆, 微震事件, 能量分形, 分形维度

Abstract: Based on a large amount of microseismic informations and hundreds of rockbursts with different intensities occurring in the deep diversion tunnels of Jinping II hydropower station excavated with drill-and-blast method and tunnel boring machine (TBM), the energy release processes of immediate rockbursts with different excavation methods are compared; and energy distribution of microseismic events are analyzed by fractal theory. The achieved results are as follows: (1) Damage of rock mass are gathering and expanding in the processes of immediate rockbursts. (2) Elastic potential energy which stored within the rock mass has different ways of release with different excavation methods. (3) The energy fractal dimension values would increase continuously before the rockburst happens and they totally increase to a critical value when the rockburst approaches during drill-and-blast method excavation. (4) The energy fractal dimension values in TBM excavation which is bigger than that in drill-and-blast method can describe the mild and moderate rockbursts of the working face.

Key words: drill-and-blast method, immediate rockburst, seismic event, energy fractal, fractal dimension

中图分类号:

TU 45

于洋，冯夏庭，陈炳瑞，肖亚勋，丰光亮，李清鹏 . 深埋隧洞不同开挖方式下即时型岩爆微震信息特征及能量分形研究[J]. , 2013, 34(9): 2622-2628.

YU Yang ，FENG Xia-ting ，CHEN Bing-rui ，XIAO Ya-xun ，FENG Guang-liang ，LI Qing-peng . Analysis of energy fractal and microseismic information characteristics about immediate rockbursts in deep tunnels with different excavation methods[J]. , 2013, 34(9): 2622-2628.

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