Response Analysis of Composite Shell with Various Fixation Patterns under Axial Impact Load in Tunnel

Abstract

Abstract. The safety equipment will against the explosive load when a disaster occurs in tunnel. This analysis of composite shell establishes a model of the relation among initial velocity, explosive load, plastic strain and shell fixation pattern, which is used to study the plastic strain of composite shell under different fixation patterns. The result shows that the fixation pattern plays a great part in the plastic strain of composite shells under axial impact load in tunnel. It is clearly that the extreme value and distribution range of plastic strain can be controlled by changing the fixation pattern. If the fixed point of composite shell is axisymmetric, the extreme value of plastic strain will decrease. Meanwhile, the distribution ranges of it remaining the same level. It is also confirmed that the plastic strain of fixed area which is far away from the explosion is more sensitive than the closer one to impact load.