Analysis of EDZ Development of Columnar Jointed Rock Mass in the Baihetan Diversion Tunnel

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• 作者：Xian-Jie Hao ; Xia-Ting Feng ; Cheng-Xiang Yang…
• 关键词：Columnar jointed rock mass ; Excavation damaged zone ; Time ; dependent behaviour ; Long ; term stability
• 刊名：Rock Mechanics and Rock Engineering
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：49
• 期：4
• 页码：1289-1312
• 全文大小：3,678 KB
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• 作者单位：Xian-Jie Hao (1)
  Xia-Ting Feng (1)
  Cheng-Xiang Yang (2)
  Quan Jiang (1)
  Shao-Jun Li (1)
  
  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, People’s Republic of China
  2. School of Resources and Civil Engineering, Northeastern University, Shenyang, 110004, People’s Republic of China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Civil Engineering
  
• 出版者：Springer Wien
• ISSN：1434-453X

文摘

Due to the time dependency of the crack propagation, columnar jointed rock masses exhibit marked time-dependent behaviour. In this study, in situ measurements, scanning electron microscope (SEM), back-analysis method and numerical simulations are presented to study the time-dependent development of the excavation damaged zone (EDZ) around underground diversion tunnels in a columnar jointed rock mass. Through in situ measurements of crack propagation and EDZ development, their extent is seen to have increased over time, despite the fact that the advancing face has passed. Similar to creep behaviour, the time-dependent EDZ development curve also consists of three stages: a deceleration stage, a stabilization stage, and an acceleration stage. A corresponding constitutive model of columnar jointed rock mass considering time-dependent behaviour is proposed. The time-dependent degradation coefficient of the roughness coefficient and residual friction angle in the Barton–Bandis strength criterion are taken into account. An intelligent back-analysis method is adopted to obtain the unknown time-dependent degradation coefficients for the proposed constitutive model. The numerical modelling results are in good agreement with the measured EDZ. Not only that, the failure pattern simulated by this time-dependent constitutive model is consistent with that observed in the scanning electron microscope (SEM) and in situ observation, indicating that this model could accurately simulate the failure pattern and time-dependent EDZ development of columnar joints. Moreover, the effects of the support system provided and the in situ stress on the time-dependent coefficients are studied. Finally, the long-term stability analysis of diversion tunnels excavated in columnar jointed rock masses is performed.