摘要
为深入探究基于限阻器的隧道让压支护,即限阻支护的受力特征,基于室内试验结果,采用数值计算和数据拟合的方法,系统阐明了限阻器的力学性能和本构关系,提出限阻支护的数值模拟方法;并结合工程应用,分析不同参数下限阻支护的变形和受力特征。结果表明:限阻器的力学性能与竖板的高度和厚度相关,引入预制弯弧可使限阻器性能可控;限阻器采用应变软化/硬化实体单元和弹性正交异性膜单元模拟;限阻器较小的恒阻值降低了限阻支护的轴力但同时也增大了弯矩,有利于小偏心受压破坏防治但增加了大偏心受压破坏风险;限阻器的合理压缩量为7~12 cm,建议在工程应用中对限阻器做降高、增厚和弯弧优化,可进一步增效降本。
In order to further explore the stress characteristics of the tunnel yielding support resistance-limiting support(RLS)based on the support resistance-limiting damper(SRLD),the mechanical properties and constitutive relationships of SRLD were systematically expounded by using numerical calculation and data fitting methods based on indoor test results,and the numerical simulation method was proposed for RLS.Numerical calculations simulating the engineering applications were conducted to analyze the deformation and stress characteristics of RLS under different parameters.The results show that the mechanical properties of SRLD are related to the height and thickness of vertical plates,and the prefabricated bending of vertical plates can make the performance of SRLD controllable.The SRLD is simulated using strain softening/hardening solid elements and elastic orthotropic membrane elements.Due to the incomplete utilization of compression capacity of SRLD,a smaller constant resistance value will significantly reduce the axial force but also increase the bending moment of RLS,which is beneficial for the prevention of small eccentric compression failure but increases the risk of large eccentric compression failure.The rational compression value of the SRLD is 7~12 cm.It is recommended to optimize the SRLD by lowering,thickening,and bending its vertical plates in deep buried old loess tunnel to further increase construction efficiency and reduce costs.
作者
申志军
王刚
仇文革
王海彦
SHEN Zhijun;WANG Gang;QIU Wenge;WANG Haiyan(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;College of Transportation Engineering,Nanjing Tech University,Nanjing 211816,China;China Railway No.4 Engineering Group Co.,Ltd.,Hefei 230022,China;Chengdu Tianyou Tunnelkey Co.,Ltd.,Chengdu 610031,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2024年第4期194-204,共11页
Journal of the China Railway Society
基金
中国铁路总公司科技研究开发计划(K2018G059)。
关键词
黄土隧道
大变形
限阻器
让压支护
受力特征
old loess tunnel
large deformation
support resistant limiting damper
yielding support
mechanical characteristics
作者简介
第一作者:申志军(1971-),男,河南开封人,正高级工程师,博士研究生。E-mail:szj71@qq.com;通信作者:王刚(1989-),男,江苏丰县人,讲师,博士。E-mail:swjtu_wg@163.com。
