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Excavation-induced microseismicity and rockburst occurrence:Similarities and differences between deep parallel tunnels with alternating soft-hard strata

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Journal of Central South University 2021年第2期28卷 582-594页

作者： FENG Guang-liang CHEN Bing-rui JIANG Quan XIAO Ya-xun NIU Wen-jing LI Peng-xiang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Guangxi Key Laboratory of Disaster Prevention and Engineering Safety Guangxi UniversityNanning 530000China Key Laboratory of Ministry of Education of Safe Mining of deep Metal Mines Northeastern UniversityShenyang 110819China

Excavation-induced microseismicity and rockburst occurrence in deep underground projects provide invaluable information that can be used to warn rockburst occurrence,facilitate rockburst mitigation procedures,and analyze the mechanisms responsible for their *** on the deep parallel tunnels with the maximum depth of 1890 m created as part of the Neelum–Jhelum hydropower project in Pakistan,similarities and differences on excavation-induced microseismicity and rockburst occurrence between parallel tunnels with soft and hard alternant strata are *** show that a large number of microseismic(MS)events occurred in each of the parallel tunnels during *** occurred most frequently in certain local sections of the two *** differences are found in the excavation-induced microseismicity(spatial distribution and number of MS events,distribution of MS energy,and pattern of microseismicity variation)and rockbursts characteristics(the number and the spatial distribution)between the parallel *** to predict the microseismicity and rockburst intensities likely to be encountered in subsequent tunnel based on the activity encountered when the parallel tunnel was previously excavated will not be an easy or accurate procedure in deep tunnel projects involving complex lithological conditions.

关键词： microseismicity rockburst soft and hard alternant strata deep parallel tunnels Neelum–Jhelum hydropower project

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