深埋隧道复合式衬砌内力和位移的荷载结构法  

Internal Force and Displacement of Composite Lining of Deep Buried TunnelsBased on Load-structure Method

作　　者：刘淑红[1] 吴辰昊 陈雪锋[2] 朱永全[1] LIU Shuhong;WU Chenhao;CHEN Xuefeng;ZHU Yongquan(Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China;China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)

机构地区：[1]石家庄铁道大学,石家庄050043 [2]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2023年第11期70-74,共5页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51778380);中国国家铁路集团有限公司科技研究开发计划项目(N2020G040)。

摘　　要：研究目的:研究任意形状的深埋隧道复合式衬砌的内力和位移具有重要理论意义和工程应用价值。本文首先通过弹性力学理论,导出轴对称荷载作用下,圆形隧道复合式衬砌的轴力和位移的解析解,并与数值解进行比较,确定初支、二衬间相互作用的杆单元弹性模量的合理取值;之后分析了Ⅳ级围岩中非圆形隧道复合式衬砌的轴力、弯矩和位移,围岩对初支、初支与二衬间的约束作用均采用杆单元模拟,其弹性模量分别取地层和初支的弹性模量;最后讨论了侧压系数对非圆形隧道复合式衬砌力学性能的影响。研究结论:(1)轴对称荷载作用下,圆形隧道初支和二衬的轴力和位移的解析解与数值解的误差不到5%,确定了使用杆单元模拟非圆形隧道初支和二衬间相互作用时,其弹性模量可以采用初支或二衬的弹性模量;(2)非圆形隧道二衬的轴力和弯矩均比相应位置处初支的大,初支和二衬分别在拱腰和拱底取得轴力最大值,均在拱脚取得弯矩最大值,均在拱底取得竖向位移最大值;(3)对于侧压系数在0.1到0.3范围内的Ⅳ级围岩,侧压系数的改变对非圆形隧道二衬最大的轴力、弯矩和位移的影响都比较小;(4)本研究结果可应用于隧道、竖井、管桩等工程结构。Research purposes:It has important theoretical significance and engineering value to study the internal force and displacement of composite lining of deep buried tunnels with arbitrary shape.In this paper,the analytical solutions of axial force and displacement of composite lining of circular tunnel under axisymmetric load are derived based on the theory of elastic mechanics,and are compared with the numerical solutions to determine the reasonable value of elastic modulus of the link element between primary support and secondary lining.The axial force,bending moment and displacement of composite lining of non-circular tunnel in gradeⅣsurrounding rock are analyzed.The constraint effects of surrounding rock on primary support,primary support and secondary lining are simulated by the link element,and the elastic modulus of surrounding rock and primary support are taken respectively.Finally,the influence of lateral pressure coefficient on mechanical properties of non-circular composite lining is discussed.Research conclusions:(1)Under axisymmetric load,the error between the analytical solution and the numerical solution of axial force and displacement of initial support and secondary lining of circular tunnel is less than 5%.It is determined that when the link element is used to simulate the interaction between initial support and secondary lining of the non-circular tunnel,the elastic modulus of initial support or secondary lining can be used.(2)In the corresponding position of the non-circular tunnel,the axial force and bending moment of secondary lining are greater than those of initial support.For primary support and secondary lining,the maximum axial force occurs at the hance and the bottom,respectively.The maximum bending moment occurs at the arch foot,and the maximum vertical displacement occurs at the bottom.(3)For gradeⅣsurrounding rock with lateral pressure coefficient in the range of 0.1 to 0.3,the change of lateral pressure coefficient has little effect on the maximum axial force,bending moment and di

关 键 词：初期支护 二次衬砌 轴力 弯矩 位移 

分 类 号：TU449[建筑科学—岩土工程]