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大断面铁路隧道室内模型试验与分析研究

ISSN号：1672-7029
期刊名称：《铁道科学与工程学报》
时间：0
分类：U451.4[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070, [2]兰州交通大学土木工程学院,甘肃兰州730070
相关基金：基金项目:国家自然科学基金资助项目(41562013);长江学者和创新团队发展计划资助项目(IRT1139);甘肃省基础研究创新群体资助项目(145RJIA332);兰州交通大学百名青年优秀人才培养计划资助项目

关键词：模型实验, 隧道衬砌, 应变片, 百分表, 围岩压力, laboratory model experiments, tunnel lining, strain gauge, dial indicator, surrounding rock pressure

中文摘要：

为研究隧道在受压破坏时，衬砌的受力特性与变形规律，采用石膏来模拟隧道衬砌，通过在关键测点布置土压力盒、应变片与百分表，监测模型衬砌的压力、应变与位移，并对监测数据进行分析。研究结果表明：各测点的围岩压力和初衬与二衬间接触压力都以压应力为主，且应力最大值出现在左仰拱拱脚、左右拱腰与仰拱拱底的位置；模型主要受到压应变，且模型衬砌内表面更容易破坏；隧道模型拱顶的沉降最大，在施工时对拱顶沉降的监测是有必要的；当隧道受到较大压力时，很可能会造成仰拱开裂。

英文摘要：

In order to study the stress characteristics and deformation of lining,when the tunnel is under pressure,the laboratory model experiments using gypsum to simulate the tunnel lining,Through the arrangement ofpressure box,strain gauge and dial indicator on the sky point,to monitor the pressure,strain and displacement ofthe lining of the model,and analysis of monitoring data.The results showed that:surrounding rock pressure andstress between the first linings and the second linings of full measuring point are mainly based on compressivestress,and the maximum value of stress is in the position of the arch foot of the left arch,the hance and the bottomof the invert;The model is mainly subjected to compressive strain,and the inner surface of the model lining ismore easily damaged;The settlement of vault is the biggest,so it is necessary to monitor the vault settlementduring construction;When the tunnel is under great pressure,it is likely to cause the inverted arch cracking.