Abstract：Research purposes: The tunnel excavation is not only a process of gradual displacement release，but also a process of gradual stress release．This paper studies the correlation between stress release and displacement with numerical simulation method．
Research conclusions: The two—dimensional analysis show that there is a certain correlation between the stratum movement and stress release．The displacements of different points and their varying laws of the stress release rate are of obvious differences．Choosing the displacement at one area to describe the displacement release around the tunnel is incomplete，while using the volume loss rate of tunnel excavation to describe the displacement release around the tunnel is more complete．The study results also show that the stratum volume lOSS rate and stress release rate are of a linear relationship basically．This relationship can be as the references to determining the reasonable stress release rate and volume loss rate(displacement release rate)．
Chen Zongji. Important Consequences of Stress Release in the Stability of Excavations[J]. Chinese Journal of Rock Mechanics and Engineering, 1992(1): 1-10.
2010, Vol. 27 
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