围岩流变特性对隧道二衬支护时机的影响

为了研究岩体流变特性情况下隧道二衬的支护时机，首先推导了在考虑围岩流变特性时，衬砌抗力、位移及围岩的位移表达式；然后以广梧高速公路茶林顶隧道岩体为工程背景，探讨了考虑岩体流变情况下，隧道二衬支护时机的确定方法，并对比了围岩拱顶下沉实测值和理论计算值。结果表明：(1) 理论分析所建立的衬砌抗力、位移及围岩的位移表达式中均包含了时间参数，可确定达到不同衬砌抗力、位移及围岩位移所需要的时间；(2) 围岩拱顶下沉实测值和理论计算值表现出相同的发展规律，验证了所建立方法的正确性。

Influence of rock mass rheological characteristic on tunnel second lining time

To figure out the second lining time of the tunnel under the consideration of rock mass rheological characteristic, firstly, the equations of the lining resistant pressure, displacement and surrounding rock mass displacement were deduced when taking into consideration the rock mass rheological characteristic; secondly, the Chalinding tunnel engineering of the Guangdong Yunwu Highway was chosen as the study background, the determination method for the second lining time of the tunnel under the consideration of rock mass rheological characteristic was proposed, and the results of the monitoring value and analytical solution value for the arch settlement were compared. The analysis results show that the equations of the lining resistant pressure, displacement and surrounding rock mass displacement all consist of the factor of time, that the time needed to reache certain value of the lining resistant pressure, displacement and surrounding rock mass displacement can be determined,and that the disciplines of the arch settlement obtained from the proposed method are the same with that from the monitoring data, which validates the correctness of the proposed method.