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Abstract The study has developed a laboratory test to simulate the excavation，supporting and deterioration process of primary support of the deep hard rock tunnel. In the paper，variation rules of displacement，load and internal force of the secondary lining in the deterioration process of primary support are analyzed. The study proves that in the primary support deterioration period or even in the failure process，there are different effects between the shotcrete and the bolts. The effect of the bolts，which has step characteristics，is much more obvious than that of the shotcrete. The increasing trends of displacement，load and internal forces are all firstly rising up slowly and then accelerating，finally becoming steady. In the vault and side walls，such mechanical phenomenon is typical. After calculation of the lining security，we found that the safety extent is satisfied. The design is relatively conservatory.
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Received: 20 June 2012
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2013, Vol. 32 
