公轨合建盾构隧道振动荷载的动力响应特性  

Dynamic Response Characteristics of Vibration Loads on Highway-Metro Integrated Shield Tunnels

作　　者：杨殿勇 张西文[1,3] 刘鑫锦 吕颖慧 秦磊[1] 刘广森[1] YANG Dianyong;ZHANG Xiwen;LIU Xinjin;LYU Yinghui;QIN Lei;LIU Guangsen(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;Shandong Rail Transit Survey and Design Co.,Ltd.,Jinan 250101,Shandong,China;Jinan Rail Transit Group Co.,Ltd.,Jinan 250014,Shandong,China)

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]山东轨道交通勘察设计院有限公司,山东济南250101 [3]济南轨道交通集团有限公司,山东济南250014

出　　处：《济南大学学报（自然科学版）》2024年第2期168-176,183,共10页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51708251);山东省自然科学基金项目(ZR2023ME070)。

摘　　要：为了探究汽车-列车振动荷载对公轨合建盾构隧道内部结构及周围土体的动力响应特性,采用有限元软件ABAQUS对某公轨合建盾构隧道内部结构及周围土体进行数值模拟,通过ABAQUS软件的Dload子程序对汽车、列车振动荷载进行耦合,分别将单一振动荷载及汽车-列车振动荷载作用引入公轨合建盾构隧道,分析公轨合建盾构隧道内部结构及周围土体在不同工况时加速度、位移、应力、应变的变化。结果表明:汽车、列车振动荷载频率不同,共同作用后产生拍频现象,导致相同方向合成荷载的振幅可能小于分荷载的振幅,当频率相同时所合成荷载的振幅最大;管片上方的土体以及非封闭弧形内衬外侧土体发生较大的应变,最大塑性应变发生于拱顶偏右侧,达到7.032×10^(-6);公轨合建盾构隧道内部结构中的预制箱涵牛腿柱、顶板处出现较大拉、压应变,在长期运营期间需要对预制箱涵牛腿柱、顶板位置进行定期检查和必要支护。To investigate dynamic response characteristics of vehicle-train vibration loads on internal structures and surrounding soil of highway-metro integrated shield tunnels,finite element software ABAQUS was used to numerically simulate internal structures and surrounding soil of a highway-metro integrated shield tunnel.Vehicle and train vibration loads were coupled by using Dload subprogram of ABAQUS software.Single vibration loads and vehicle-train vibration load were respectively introduced into the highway-metro integrated shield tunnel,and changes of acceleration,displace-ment,stress,and strain of the internal structure and surrounding soil of the highway-metro integrated shield tunnel under different working conditions were analyzed.The results show that vibration load frequencies of vehicles and trains are different,and the combined action produces a beat frequency phenomenon,resulting in amplitude of synthesized load in the same direction being smaller than that of partial load.When the frequency is the same,the amplitude of synthesized load is the largest.The soil above pipe segments and the soil outside unenclosed arc lining experience significant strains,and the maximum plastic strain occurrs on the right side of the arch crown,reaching 7.032×10^(-6).The prefabricated box culvert bracket columns and top plates in the internal structure of the highway-metro integrated shield tunnel exhibit large tensile and compressive strains.During long-term operation,it is necessary to regularly inspect and provide necessary support for the positions of prefabricated box culvert bracket columns and top plates.

关 键 词：公轨合建盾构隧道 动力响应特性 汽车振动荷载 列车振动荷载 耦合振动荷载 

分 类 号：U45[建筑科学—桥梁与隧道工程]