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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 4    April 2017

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Collapse analysis of tunnel floor in karst area based on Hoek-Brown rock media
YANG Xiao-li(杨小礼), LI Zheng-wei(李正伟), LIU Zheng-an(刘拯安), XIAO Hai-bo(肖海波)

School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:Collapse shape of tunnel floor in Hoek-Brown rock media is investigated with the functional catastrophe theory. The stability of rock system in tunnel floor, which is determined by thickness, half collapse width, half length of cave and detaching curve, has great secure and economic significance in practical engineering. To investigate the failure mechanisms and the outline of detaching block, a reliable damage model is presumed by making reference to the limit analysis theory. The analytical solutions of detaching curve, half collapse width on tunnel floor and the critical and maximum values of collapse thickness are derived based on Hoek-Brown criterion and functional catastrophe theory. The result shows that 0.5 is a most probable condition for instability, and the shape of detaching curve is a part of parabola. It is reasonable by comparing with previous theory and analogous experiments. The effects of major factors on thickness and half collapse width are further discussed. Numerical calculations and parametric analysis are carried out to illustrate the effects of different parameters on the mechanism, which is significant to the stability analysis of tunnel floor in rock media.

 

Key words: karst; functional catastrophe theory; Hoek-Brown criterion; safety thickness; tunnel floor; upper bound

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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