For the failure mechanism of straight joint shield tunnel lining structure under side-unloading conditions，a quasi-static test method is proposed.And a full-scale test of anti-collapse property is completed. Based on the test results and phenomena，the whole bearing process of lining structure were analyzed. The failure mode，ultimate bearing capacityand overall safety of lining structure were discussed. Through experiments and calculations：the failure of lining structure is a beam hinge mechanism，while sufficient plastic hinges appear，the ultimate bearing capacity of the structure can be estimated by virtual work theory. Using load reserve ratioas a safety indicator，the overall safety factor of lining structure under side-unloading conditions is 1.62.
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2015, Vol. 34 
