Research on the closure and creep mechanism of circular tunnels

A numerical code called Rock Failure Process Analysis （RFPA2D） was employed to investigate the closure, damage and failure behavior of the horizontal tunnels. In this code the time-dependent deformation was described in terms of evolution of mesoscopic structure, leading to progressive degradation o...

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Bibliographic Details
Published in:Journal of coal science & engineering, China China, 2008-06, Vol.14 (2), p.195-199
Main Author: 李连崇 唐春安 马天辉 赵兴东
Format: Article
Language:English
Subjects:
Earth and Environmental Science
Earth Sciences
Geochemistry
Geology
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Mechanical Engineering
数字计算
环形隧道
闭合作业
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Summary:A numerical code called Rock Failure Process Analysis （RFPA2D） was employed to investigate the closure, damage and failure behavior of the horizontal tunnels. In this code the time-dependent deformation was described in terms of evolution of mesoscopic structure, leading to progressive degradation of elastic modulus and failure strength of material. In terms of material degradation, a series of numerical simulations were performed to study the convergence and subsequent failure in circular tunnels. The numerical results provide a complete illumination for the closure, damage and failure behavior with different loading conditions. It is shown that the depth and the ratio of far field stresses play an important role in the creep behavior of tunnels. Creep failure is expected to occur in the direction of the smallest far field stress component, which means that rheological failure of tunnels is influenced not only by the rock characteristic around the tunnels but also by the orientation and distribution of far field stress on a global scale.
ISSN:1006-9097
1866-6566
DOI:10.1007/s12404-008-0040-2