循环荷载作用下大直径盾构隧道力学变形特性研究  

Research on Mechanical and Deformation Characteristics of Large Diameter Shield Tunnels under Cyclic Loadings

作　　者：李春林 张西文[2,3] 刘广森 刘俊岩 刘燕[2,3] 孙文昊 张亮亮[4] 何应道 LI Chunlin;ZHANG Xiwen;LIU Guangsen;LIU Junyan;LIU Yan;SUN Wenhao;ZHANG Liangliang;HE Yingdao(Jinan City Construction Group Co.,Ltd.,Jinan 250131;School of Civil Engineering and Architecture,University of Jinan,Jinan 250022;The Engineering Technology Research Center for Urban Underground Engineering Supporting and Risk Monitoring of Shandong Province,Jinan 250022;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063)

机构地区：[1]济南城市建设集团有限公司,济南250131 [2]济南大学土木建筑学院,济南250022 [3]山东省城市地下工程支护及风险监控工程技术研究中心,济南250022 [4]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《现代隧道技术》2022年第5期47-53,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金(51708251).

摘　　要：盾构隧道在运营期受循环往复车辆荷载作用会发生应力集中和塑性应变累积,导致隧道结构容易出现疲劳损伤和开裂变形。采用ABAQUS有限元软件和混凝土塑性损伤本构模型(CDP)建立了双层盾构隧道数值计算模型,分析隧道管片、内部结构和连接螺栓的内力和变形规律。结果表明,隧道管片和内部结构的内力在循环往复荷载作用下呈现周期性变化,随着荷载作用次数的增加,隧道管片和内部结构的塑性应变区增大,内部结构路面层的竖向位移逐渐增大;内部结构连接螺栓随着循环荷载作用同样呈周期性变化,内力最大值出现在连接螺栓的中间部位,且靠近荷载作用位置处的连接螺栓轴力较大;管片结构在土层压力和车辆荷载共同作用下,在拱底和拱腰处发生应力集中,出现明显的塑性变形。The cyclic vehicle loads on the shield tunnel during operation period always induce stress concentration and plastic strain accumulation,which lead to fatigue damage and cracking deformation of tunnel structures.Based on ABAQUS software and concrete plastic damage constitutive model(CDP),a numerical calculation model of double-deck shield tunnel was established,the internal force and deformation characteristics of tunnel structure and connecting bolts under different cyclic times were analyzed.The results show that(1)the internal force of tunnel segment and internal structure present periodic variation according to the cyclic vehicle loads.With the increase of loading frequency,the plastic strain zone of tunnel segment and internal structure increases,and the vertical displacement of internal structure increases.(2)The axial stress of connecting bolts also shows periodic variation,and the maximum axial stress appears in the middle of the connecting bolt.Under the cyclic load,the axial stress of the connecting bolt near the loading position is larger than that of the surrounding bolts.(3)Under the action of soil pressure and cyclic vehicle loads,stress concentration occurs at the bottom and waist of tunnel segments,where the plastic deformation accumulation is easy to occur at the stress concentration area.

关 键 词：盾构隧道 内部结构 混凝土损伤 循环荷载 螺栓应力 

分 类 号：U451[建筑科学—桥梁与隧道工程]