Comparison of seismic effects during deep tunnel excavation with different methods

查看全文 作　　者：Xie [1,2]Liangtao;Yan [1,2]Peng;Lu [1,2]Wenbo;Chen [1,2]Ming;Wang [1,2]Gaohui

机构地区：[1]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;[2]Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering Ministry of Education,Wuhan University

出　　处：《Earthquake Engineering and Engineering Vibration》索引2018年第17卷第3期,共17页

基　　金：National Key Research and Development Program of China under Grant No.2016YFC0401802;National Natural Science Foundation of China under Grant Nos.51779192 and U1765109 摘　　要：The rapid release of strain energy is an important phenomenon leading to seismic events or rock failures during the excavation of deep rock.Through theoretical analysis of strain energy adjustment during blasting and mechanical excavation,and the interpretation of measured seismicity in the Jin-Ping Ⅱ Hydropower Station in China,this paper describes the characteristics of energy partition and induced seismicity corresponding to different energy release rates.The theoretical analysis indicates that part of the strain energy will be drastically released accompanied by violent crushing and fragmentation of rock under blast load,and this process will result in seismic events in addition to blasting vibration.The intensity of the seismicity induced by transient strain energy release highly depends on the unloading rate of in-situ stress.For mechanical excavation,the strain energy,which is mainly dissipated in the deformation of surrounding rock,releases smoothly,and almost no seismic events are produced in this gradual process.Field test reveals that the seismic energy transformed from the rock strain energy under high stress condition is roughly equal to that coming from explosive energy,and the two kinds of vibrations superimpose together to form the total blasting excavation-induced seismicity.In addition,the most intense seismicity is induced by the cut blasting delay; this delay contributes 50% of the total seismic energy released in a blast event.For mechanical excavation,the seismic energy of induced vibration(mainly the low intensity acoustic emission events or mechanical loading impacts),which accounts only for 1.5‰ of that caused by in-situ stress transient releasing,can be ignored in assessing the dynamic response of surrounding rock. 关键词：地震事件隧道挖掘机械挖掘动态反应精力版本岩石强风

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Comparison of seismic effects during deep tunnel excavation with different methods

参考文献(43)

引证文献(5)

耦合文献(194)

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