Public transport systems such as subway transit tunnels are prone to terrorists’ bombing attacks in recent years.Segmental lining is the most common type of liners adopted with the increasing use of TBM（tunnel boring machine）in tunnel constructions in urban areas.The most apparent difference between segmental tunnel lining and an integral one lies in the existence and distribution of joints that bind several types of segments in a ring and rings in the longitudinal direction of a tunnel,which are connected by pre-stressed jointing bolts.Due to the effects of joints,the overall rigidity and loading capacity of segmental lining are relatively low,compared with that of an integral one,also the deformation and damage mechanism are different.Assuming the scenarios of internal explosion under a case of terrorist attack,few research results could be traced on the internal explosion capacity of segmental tunnel linings.In this paper,it began with the analysis of full-scale test results of segmental tunnel linings under the condition of internal explosion,the deformation and failure patterns of segmental tunnel lining were outlined,and the key factors and positions that dominate the damage of a lining were figured out.Then attempts were made,by adding flexible damping cushions on the joints,to relieve the damage degree of contact area of bolts,thus optimizing segmental lining structure’s internal explosion capacity.At last,numerical simulations were performed and it was shown that,the localized failures of joint areas of tunnel segments could be relieved effectively after introduction of this method,so the internal explosion resistance performance of segmental lining structures could be optimized and hence improved.
Key words
internal explosion /
segmental tunnel lining /
blast mitigation
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