作　　者： ; ; ; (徐学深）;

机构地区： 长安大学

出　　处： 《中国公路学报》 2014年第1期84-93,共10页

摘　　要： 结合依托工程,运用自制的模型试验平台,针对原有隧道不同服役状态系统开展了5组室内模型试验,分析了隧道新旧衬砌结构的受力特点,研究了不同类型隧道扩建的围岩压力分布规律,并将试验结果与有限元计算结果进行了对比验证。结果表明:病害工况下隧道扩建施工中,衬砌与围岩的力学行为变化与无病害情况相类似,其病害主要影响上台阶施工;不同病害工况对衬砌结构受力的影响程度和范围不同;各工况围岩压力分布特征也不同;扩建完成后,新隧道衬砌结构各部位应力为扩建前的1.3倍,围岩压力整体水平为扩建前的1.2倍;病害对隧道扩建施工力学行为的影响程度为仰拱位置出现病害比拱腰位置出现病害影响小,拱腰位置衬砌背后围岩出现空洞比衬砌强度不足影响大,仰拱位置衬砌强度不足比仰拱底部回填不密实影响大。 Combined with an actual project, using homemade model test platform, five indoor model experiments were carried out according to different service states. Analysis of the mechanical characteristics of old and new linings in tunnel was performed. The stress distribution characteristics of surrounding rock in expansion of different tunnels were studied, and the experimental results were compared with the calculated results with FE model for verification. The results show that for tunnel expansion under disease conditions, the impact of disease conditions mainly displays in construction of above step; different disease conditions have different impacts on lining structure in degree and scope; the stress distribution characteristics of surrounding rock are different; after the expansion of tunnel, the stress on various parts of lining structure is 1.3 times of that before the expansion; the new tunnel＇s overall stress of surrounding rock is 1.2 times of that before the expansion; the impact of the invert position disease on themechanical behavior disease occurs insufficient lining strength than that in tunnel expansion in the arch waist with strength and if the dis with cavity behind th is smaller than waist position arch disease; it is bigger if cavity behind the lining surrounding rock than that with ease occurs in the invert position with insufficient lining e lining surrounding rock.

关 键 词： 隧道工程 隧道扩建 模型试验 力学特征

领　　域： [建筑科学] [交通运输工程]