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《Chinese Journal of Rock Mechanics and Engineering》 2015-S2
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COMPARISON OF EVOLUTION CHARACTERISTICS OF IMMEDIATE AND TIME DELAYED ROCKBURSTS UNDER DIFFERENT EXCAVATION METHODS

FAN Yong;LU Wenbo;WANG Yichang;YAN Peng;CHEN Ming;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan University;  
For a case of circular deep-buried tunnel,cracking extent and extending length in surrounding rock masses under blasting and TBM methods are calculated,and energy dissipation during the cracking of surrounding rock masses is analyzed. In addition,based on the index of releasable strain energy,rank and position of rockbursts are determined. Results show that,compared with the quasi-static unloading of in-situ stress caused by tunnel boring machine excavation,the transient release of in-situ stress induced by blasting excavation aggravates the cracking in surrounding rock masses,and enlarges the energy dissipation during this process. This minifies the releasable strain energy after the excavation unloading and brings down the risk of time delayed rockbursts;while during the transient release of in-situ stress,influenced by high aggregation of energy,the releasable strain energy is enhanced,and the risk of immediate rockbursts is enlarged for the blasting excavation.
【Fund】: 国家杰出青年基金项目(51125037);; 国家重点基础发展计划(973)项目(2011CB076354);; 高校博士点基金项目(20110141110026)
【CateGory Index】: TU45
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