Abstract：Research purposes: More and more excavations with different excavation depth have appeared，Researching the strain and stress of the supporting structure in the conditions of different depth of excavation，a finite element analysis model built on Ansys is proposed in the paper, which provides an important reference for the design.
Research conclusions:(1)The stress and strain of supporting structures change with pit excavation，nearby the pit plane，the value reach to maximum. (2) The result shows that there is the great difference between the stress and strain of supporting structures on two sides. So it’s necessary to calculate and analyse supporting structures on two sides separately while design the unbalanced excavation.(3)This paper provides valuable reference to design the unbalanced excavation.
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2013, Vol. 30 
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