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Thermography analyses of rock fracture due to excavation and overloading for tunnel in 30° inclined strata

Thermography analyses of rock fracture due to excavation and overloading for tunnel in 30° inclined strata
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摘要 Large-scale physical model test of 30°inclined strata was conducted to investigate the damage mechanisms during the excavation and overloading using infrared detection.The experiment results were presented with thermal images which were divided into three stages including a full face excavation stage,a staged excavation stage,and an overloading stage.The obtained results were compared with the previously reported results from horizontal,45?,60?,and vertical strata models.Infrared temperature(IRT)for 30°inclined strata model descended with multiple fluctuations during the full-face excavation.For the staged excavation,the excavation damage zone(EDZ)showed enhanced faulting-like strips as compared in the 45?,60?,and vertical models,indicating the intensified stress redistribution occurred in the adjacent rock mass.In contrast,EDZ for the horizontal strata existed in a plastic-formed manner.During the overloading,abnormal features in the thermal images were observed preceding the coalescence of the propagating cracks.The ultimate failure of the model was due primarily to the floor heave and the roof fall. Large-scale physical model test of 30°inclined strata was conducted to investigate the damage mechanisms during the excavation and overloading using infrared detection.The experiment results were presented with thermal images which were divided into three stages including a full face excavation stage,a staged excavation stage,and an overloading stage.The obtained results were compared with the previously reported results from horizontal,45?,60?,and vertical strata models.Infrared temperature(IRT)for 30°inclined strata model descended with multiple fluctuations during the full-face excavation.For the staged excavation,the excavation damage zone(EDZ)showed enhanced faulting-like strips as compared in the 45?,60?,and vertical models,indicating the intensified stress redistribution occurred in the adjacent rock mass.In contrast,EDZ for the horizontal strata existed in a plastic-formed manner.During the overloading,abnormal features in the thermal images were observed preceding the coalescence of the propagating cracks.The ultimate failure of the model was due primarily to the floor heave and the roof fall.
作者 SUN XiaoMing XU HuiChen HE ManChao GONG WeiLi CHEN Feng Sun, XiaoMing[1]; Xu, HuiChen[1,2]; He, ManChao[1]; Gong, WeiLi[1]; Chen, Feng[1,2]
出处 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2017年第6期911-923,共13页 SCIENCE CHINA Technological Sciences
基金 supported by the National Key Research and Development Plan of China (Grant No. 2016YFC0600901) the National Natural Science Foundation of China (Grant Nos. 51374214, 51134005 & 51574248) the Special Fund of Basic Research and Operating of China University of Mining & Technology, Beijing (Grant No. 2009QL03) the State Scholarship Fund of China
关键词 隧道开挖 倾斜地层 超载 成像分析 岩石断裂 物理模型试验 全断面开挖 经济开发区 deep tunnel inclined strata failure process large-scale physical model infrared thermal imaging technology
作者简介 Corresponding author (email: sxmcumtb@ 163.com)
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